Bad ecm ground

Also, to save power, it goes into one of three status based on operating conditions (ie "sleep mode"). Check for a good ground where the wire is grounded. After doing several stuff he said it's a bad wire or a bad ecm There are many reasons why you could have an faulty ECU. So obviously this case is bad! We now have a double effect causing the ECU ground to sit higher than the engine ground. 02 volts. If you do not have 5 volts coming out of the computer, the computer is bad. 87 Burban. Fill out the Repair and Return Form and send us your unit today. The coils however are grounded to the engine, which means that when the ECU is outputting zero Volts on its ignition output, the coil sees a positive voltage (equal to the A bad jump can also blow out 2 amps which are located between the ECM and the firewall. 7 V6 P0204 code & no ground signal to # 4 injector from PCM . Wire from injector to PCM is good . 2Dec 15, 2013 · Bad MAF harness Ground- Nissan Official Fix Sign in to follow this . This video shows how to test both. I took it to a shop and had them hook it up. Welding and lightning Arc welding on the frame can blow out the ECM as well as lightning strikes. Hey guys, I've had the intermittent poor idle/stalling issue for years, and have narrowed it down the infamous MAF sensor harness ground. The large ground straps to the engine being bad would cause the engine to die when this happens. The power wires all had charging system voltage and the ground was ok at 0. To test the ground wire, power the meter on one lead and check the ground wire with the Nov 11, 2011 · A bad ground just fails to complete a circuit. I just wanted to verify what I already know- bad Ecm or bad wiring (on my part). Updated on September 25, 2016. Symptoms of a Bad or Failing Engine Control Module (ECM) Symptoms of a Bad or Failing Engine Control Module (ECM)ECU grounding do s & don’t s by Adaptronic. Jan 16, 2018 · Bad wire/ecm. Bad grounds on modules cause sensors to get mis-read, so voltage drop your ground and make sure it's no more than . ---- I will look into the power sources for these items. Contact Author. The ECT sensor comes as either a 2 or 3-wire type. Took it off, cleaned it, no problems since. Dodge Ram Truck Diesel ECM. And from there it can get confusing, because there's a whole rat's nest of electrical terminology to trace and pick through. The voltage for the ECM is probably critical but it is almost certainly protected by a pretty good voltage regulator (probably as a non-replaceable component of the ECM itself). That means the circuit is designed to be pulled to ground. being that I can communicate with the ecm I still think …Next there are a couple of fuses that are in the system as well and finally the ECM is bad causing the problem. It provides a dedicated ground for the EGR, Baro, ACT, ECT, & TPS sensors as well as the ground to put the computer into self test mode. The reason why I got a new ECM the old one had no communication with with my Prolink. the electronic control module (ecm) The electronic control module is the microprocessor that receives electronic inputs from sensors and switches, and is calibrated to control fuel metering, injection timing, diagnostics, and engine protec- Battery +12V (ECM Supply (+)) is pin 4 on the 4 pin plug. Re: 92 s10 Bad ECM? Dangerous to rely on wire colors since it is all too easy to splice in a wire of a different color, that is why i actually put in the pins on the plug. Trouble Shooting For those that are used to using a meter and/or test light for trouble shooting, there is a wiring diagram of the factory fan circuitry at the bottom. ground for ecm on gmc savana 2000 i think i need a new ecm, check gauge light on in the dash - GMC 2000 Savana question yep bad ground in the dash If diagnosis is still "bad ECM", then ask for written work order that includes diagnosis including fault codes it is based on, and description of the fix including cost like ECM module, programming, any additional labor. If you are using a 12V power you should see 12V on the meter. Select your year Jeep Cherokee PCM ECM ECU Engine Computer and get back on the road ASAP. A bad oil leak is an instigator; oil will find its way into the ECM and slowly eat up its circuits. is the world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Ignition Control Modules (ICM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. Tacomas (1995-2004)' started by 83245kevin, Sep 15, Both show battery voltage and ground just the same. The PCM can't operate properly if it does not have a good source of power and a good ground. Author: HVCCAutomotiveViews: 120KGMC Sierra 1500 Questions - Bad ground? - CarGuruswww. The current problem that I have is the way I wired, it appears that the Ecm is not switching the ground, as such, the new relay for the low pressure pump is on continuously. 05 V away from V-. If this ground is bad, none of the sensors mentioned will work When i ground my ecm the truck shuts off, 91 4runner v6 3. c. Link to post Share on other sites. We can save you the time and money by testing your ECU DME before spending on costly diagnostic labor and sensors. com/article/symptoms-of-a-bad-or-failingThe engine control module (ECM), also commonly referred to as the engine control unit (ECU) or powertrain control module (PCM), is one of the most important components found on virtually all modern vehicles. So you will never have 12v there. If you type "electronic control module," or its better-known acronym, ECM, into the search field, you'll be gently guided over to the ECU (engine control unit) page. There are a bunch of grounds in the fuel injection and computer wiring harnesses for this reason. Bad ground circuits and improper voltages can also lead to erratic operation or damage to the ECM. When the ground is removed, if a spark is seen at the coil cable (I assume they mean secondary), they say the ECM is bad. how do i know if the pcm is bad for sure on a 2002 ford expedition 4. If you need a Chevy ECM not listed here, call us to check availability. Starter. It is the central control unit of most vehicles and controls a variety of functions, such as electrical system power distribution, emissions, ignition, and fuel systems. If you have 5 volts there, the wire is bad. so, i decided to plug the "bad" ECM in and it ran like a champ also. I have the t5 with a manual O2 harness that is hooked to the existing engine harness. There are many reasons why you could have an faulty ECU. Some shop manuals and Over 1000 miles into the change over and ground update and the truck is performing flawlessly. The Engine Control Module (also called the Powertrain Control Module or PCM) is the brains of the engine management system. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. Voltage supplies should be checked and verified. Starter is good, however a The ground is a major part of the battery's charging system, so assuming that you're getting proper voltage output from the alternator wire, and the battery isn't hashed, then you may be looking at a bad ground wire. Author: PrototypexlViews: 45KSymptoms of a Bad or Failing Engine Control Module (ECM https://www. d. com › Questions › GMC › Sierra 1500This is only my assumption but I may be wrong---> If you were losing ground to the trans control module I would also have to assume you would lose your ground to the engine control module. Clean the following surfaces on each ECM ground terminal. code 1521 can also be cause by a bad oil pressure switch as the powertain control module determines the oil type by using the oil pressure, oil temperature and other vital engine inputs The 1521 code indicates that you have the wrong oil in the engine, but if by chance it is correct, then this code may be set because of the 520 code. A car's computer or PCM - ECM (powertrain control module - engine control module) is designed to read various sensors such as the crankshaft position sensor to deliver In a two wire sensor, one wire is the reference signal to the ECM, the other wire is the ground. Below is a helpful guide to determine if you have a faulty ECU. The engine may still crank, but it will not be able to start without the vital inputs from the computer. The ECM will act as if no knock is present, and may possibly result in engine damage, due to detonation. Both show battery voltage and ground just the same. Such a ground lead is attached to the engine block or chassis and feeds an ECM O2 ground pin only. I am asking because I suspect that I may have a bad engine harness that's causing an injector to see a continuous ground, thus holding it open. Mar 29, 2011 · PCM power and ground testing. (PCM: Power-train Control Module and ECM: engine control module; are the 2 major computers to your car. The story, in short version, is that my 1993 Ranger had gradually developed a problem where it would buck, and pop, and lose power. Scanned the code and it says P2507 ECM/PCM POWER INPUT SIGNAL. Jeep Cherokee Electrical Problems: Bad Ground Points & Connectors This page shows the areas you should ensure are well grounded. The inner 2 wires I don't know how to test to see if the signal is getting to the ecm. It is mounted behind the distributor on the driver’s side and if it is not black, it is suspect due to a run of bad units that stayed in the GM parts pipeline for some time). Maybe the ECU ground is not all that good. Jun 21, 2016 · I already figured it out, this was a loose PCM ground wire (on the negative battery terminal wire). fuel ect. The breaker points are constructed of a low resistance metal, usually tungsten. Diesel ECM Computers customer-centric auto computer re-manufacturing & rebuilding company. 1v at O2 sensor, and post the results. The PCM does not control the fuel system, but it does manage the cruise control, battery charging, A/C operation, instrument panel functions, and automatic transmission shifting. and all are OK per shop manual and still have P0300 (gen misfire), P0303, and P0306 misfire. If either of these gets you a 1-2 code, your computer is good, but the wiring ECM to diagnostic gounding terminal A or bad wiring from ECM to terminal B. Great troubleshooting guide! I am trying to determine why a GE 2. The generic trouble code P2509 power input signal intermittent refers to an engine with an intermittent electrical signal to the Electronic Control Module (ECM) otherwise also known as a PCM or Powertrain Control Module. Know anyone else that has one you can swap over to yours to see if that fixes the problem before you buy one? Only way to really know if an ECU is bad is to replace Jan 12, 2015 · I would clear codes and see what resets and go there. SORRY It is the right oil, the 5W-20 and the oil pressure sensor was replaced twice. I would check the wires, connections, make sure nothing is chaffed or shorting grounding out somewhere, or a pinched wire. Discussion in '1st Gen. Learn about this problem, why it occurs, and how to fix it. ECM failure. It controls the fuel mixture, ignition timing, variable cam timing and emissions control. Without this, the ECU tends to earth/ground elsewhere, causing a specific trace to burn out on the circuit board and killing the ECU. The same computer was used both for 305 and for 350 engines. I will try grounding right at battery and see if I am still only getting . This leaves only 2 volts available (in a standard automotive 12V system) to power the circuit and means that all that extra power must be dissipated as heat at the resistor (bad ground). Common areas that cause failures are: poor grounds and powers, bad wiring, shorted solenoids/relays, or misdiagnosis by the installer. Repair options are limited. Battery and EMC on 1994 & 1995 models. It could also be some sort of an internal ECU ground and for some reason it doesn't work sometimes so the harness just gives it an extra ground. A4- gry- to EGR relay. In general, the ground configurations will involve either a floating ground, a single point ground, a multipoint ground, or some hybrid combination of these. Detroit Diesel Ecm Repair We at Detroit Diesel ECM know the heart of the Series 50/60 engine is the Electronic Control Module (ECM) and when one fails you are literally "dead at the side of the road". The ECM only monitors the input side (i. It may not have magic but it almost feels like it, have a lot more grey hairs. You should have ground though. Midwest ECM Repair specializes in rebuilding and re-manufacturing ECMs for Cummins Celect and Cummins Celect Plus L10, M11, and N14 diesel engines. At rest, this sensor outputs a relatively low voltage signal; as the arm/shaft is turned (as it would when the throttle opens), the output voltage increases. If you have a simple circuit with a just a light, unhook the ground and the ground will read 12 volts because the circuit is open. Battery reads 11. The ECM that is being fooled is doing its job correctly. ask. In biology, the extracellular matrix (ECM) is a collection of extracellular molecules secreted by support cells that provides structural and biochemical support to the surrounding cells. Drove it off the lott, parked it and it wouldn't start! The ground paths for the current to travel on the return to the battery are the main ground to the engine and the wire tied to the chassis. Whether you’re maintaining your 4th generation Corvette or completing a full restoration, our selection of C4 Corvette Electrical Component parts is unsurpassed. A variable signal, such as that from a IAT is used by the ECM for interpretation. bad ecm groundJan 24, 2012 Engine Control Module (ECU) Ground Circuit (CC. If the high speed data line is shorted to ground, power Re: BCM/ECM Issue '09 AcadiaGround? Have you looked at electric circuits associated with the shifter? I know part of the shifter/transmission interface is manual, but there are some electronic components that lock/unlock doors, change indicator lights, etc. Another example of a two wire sensor is a heated O2 sensor, where the sensor input and low reference is provided to the ECM. The ECM is designed to handle road spray (even that fails eventually), but pressure washing will drive water and chemicals past the seals. If the IAC valve coolant tube ruptures it can provide a faulty ground through the ECM frying the IC. If you have a Nissan vehicle with the MIL “ON” that has DTC P0603 (ECM power supply) stored in the ECM: - Perform the diagnostic steps in this bulletin FIRST. ECU, A/C compressor clutch on 1994 & 1995 models. This is the key to the switch or if this replacement is a bad unit Internal circuits of the IPDM/ER control on-off functions of the relays, CAN communication, etc. These devices monitor the fuel, air and electrical aspects of a Dodge engine to ensure optimal engine performance. Free 1 Year Warranty and Shipping Included. ---- I will look into the power sources for these items. Mar 03, 2018 · How to tell if you have a bad or fried ecu Posted by theslab, Nov 29, 2010. How to repair a bad ground from ecm I get code p0135 which is heater circuit and I know I have a bad ground. Exposure to moisture slowly corrodes the wire's harness and causes the ECM to shut down the vehicle's engine. With key-on-engine- off, probe each ground Feb 1, 2017 ECU grounding I've seen much "debate" about the best way to but some people do because I find myself explaining to people why it's bad. The only difference between the two engine sizes was the PROM that was used. yourmechanic. even put in a new ground. You can directly short the wire to ground with no damage to the PCM. ECM SERVICE GUIDE A Regal Brand ECM products. Author: PrototypexlViews: 46KSymptoms of a Bad or Failing Engine Control Module (ECM https://www. Apparently, the ECM ground feeds into it, because after I made sure it was dry, and added a redundant ground to the frame/body, I haven't had the problems with my car cutting of, or not 2002 Dodge Durango PCM ECM ECU Engine Computer 4. ECM MPR Battery Ground Battery Ground ECM PWR ECM PWR VIGN IVS VREFB Signal GND B APS BAP ECI DDS CAN1 SHD CAN1 (-) CAN1 (+) ECL RSE EFAN VSS (+) VSS So if you have a bad ecm that requires replacement then we will have to program the new ecm to match all the data of your old ecm. Presently when you are faced with a bad ECM your only options are purchasing a new unit from the manufacturer which can cost from $2,500-$5,000 US to using a “pullout” or used ECM which is unlikely to be still in working order and would have to be reconditioned and coded with the features and parameters of the tractor truck or rig. Possible Bad Ground Connections? I did some research and the first thing i did to it was put a mechanical fp gauge on it since it had the factory lp on it. The 2006 Volkswagen Passat has 1 problems reported for ecm lost ground. be dealing with a bad ECM. THen within the second year of ownership another PCM failure, BUT the dealer decided to change the ECM and PCM , in the process they found I had a loose ground wire too. Module Experts provides a full line of Chevrolet ECM Repair. I got my 88 XR7 wired up, completed the maf conversion wiring, and wired up a NGS and a css in the pin 30 and 46 circuit. The light green wire should have continuity to ground when trying to start the engine. FORD RANGER (AND EXPLORER) DRIVEABILITY ISSUES . Often the wiring from the primary o2 can ground out ( the coating gets stripped) and that has been known to fry an ECU. If the dealer replaced the ECM earlier this year than I would suspect that that is the problem. Jun 21, 2016 · I already figured it out, this was a loose PCM ground wire (on the negative battery terminal wire). The following applies to recovering the OBD-I (On Board Diagnostics) codes on the 1984 through 1993 model C4 Corvettes via the 12 pin ALDL connector located under the dash just to the right of the steering column. The voltage level is very important with all these computer modules. I doubt you have all these issues unless you have a bad ECM ground or something. I then checked the other direction to confirm I have continuity to ground in the wiring harness as well as continuity in both the supply and the signal wires from the CPS connector to the appropriate pins in the ECM connectors. Check main ground wires to body and engine block to be sure they have a good clean tight connection. Also checked for power un switch and ground un switch, all were good. This will e Pontiac Grand Prix Engine Control Module (ECM) can fail - 45 reports. DIY Auto Service: ECM PCM Computer Sensor Diagnosis and Testing. The garage cleaned up several corroded ground connection and then everything worked fine. 12- Electronic Control Module (ECM) Panel ground wire MUST BE connected to instrument terminal that has an 8 gauge BLACK Corrosion and physical damage are the most common reasons to replace an engine control module wiring harness. Topic: bad ECM? no spark a bad CAS should show a Code 42, I do not think there is a Code for the Igniter or Coil. the bad batteriers ,,,ground ect is a possibillity since all of our codes for LOW VOLTAGE was on the same GROUNDING terminal in the ECM. 00. more. Find best value and selection for your 2000 TOYOTA AVALON ENGINE COMPUTER ECU ECM search on eBay. these all ground individual connectors to the ECM. I took it to the Mazda dealer and they said the only way to fix it was replace all 6 ignition coils (including the new one) and the ECM ($2000). This is only my assumption but I may be wrong---> If you were losing ground to the trans control module I would also have to assume you would lose your ground to the engine control module. its like a slinky! useless but fun to watch. Prior to replacing the ECM, the installer should determine what caused the ECM to fail. cargurus. Therefore, a bad ground complicates diagnosis because it affects several components at once. Post Reply. Ztrem Mechanic thinks I need a new ECM …Oct 25, 2015 · How to check for a bad ECM/PCM HELP!!! Thanks so much for your post. It kills the driver for that cylinder if it is a complete coil failure. Jan 20, 2016 · There is ground present at 11. I was showing 10-12lb driving down the road. Or at least this follows on my 2003 xb9r, had that entire area apart when I did my headlight mod, very familiar with it. 1994 honda accord dx bad ecu or ecu ground where is the ecu ground wire? when i did the diagnostic check the check engine light came on but didn't blink so thats a code 0 right. Note that it is for an '87 which uses a RLYS fuse (an '86 does not-tho' it still uses the brown trigger wire). The MAT uses the same sensor ground as the TPS and CTS ,so I spliced into the ground wire at the ECM (D-12 black,no stripe). Turned out to be a bad ground on the harness for the ecu. I already figured it out, this was a loose PCM ground wire (on the negative battery terminal wire). 8 Ecu fuse reads 11. 10 B ECM Ground GND-I The ECU provided ground goes to various sensors. One thing your not disconnecting the ecm. When a ground opens, it will show full voltage at the ground. To test the ground wire, power The large ground straps to the engine being bad would cause the engine to die when this happens. Ground for the ECM is located behind the starter You must remove the starter to get acces to it. Make sure the computer is getting power and ground. The ground I'm talking about is in the driver's side kick panel. No fuel and no spark can be ecm related Many foreign car ecm computers with carbureted engines and most American and foreign cars with fuel injection use an electric fuel pump controlled by the ecm. Regular price: $325. (you let the smoke out, sorry!) Hot wiring the TPS or ECT you risk blowing up the ECU +5vdc-ref power supply. Putting black probe on negative bat terminal and red on metal of other 2 pins meter read no voltage. now the stalling forget the ecm or the body ecm start first with the crank sensor it wont Tips and advice on the Cummins Celect and Celect Plus engine platform: Never pressure wash the ECM. Connect a ground strap (minimum of a 4 Ga. Source(s): every time I thought I fixed mine the fuel pump or the distributor would act up To check your voltage you need to check from pin 24( +8v) and pin 4 ( ground for the sensors) This is off the ECM. Add to Cart. P0657-Bad ECM? Discussion in 'Technical Chat' started by ratman, Dec 13, 2009. I have 12v one side but no ground on the Are you experiencing intermittent or multiple Injector problems? It very well may be your ECM! There is a high rate of these particular units failing due to internal component failure. bad ecm ground I DO have the 12V from the orange wire(pin 5), which is hot all the time from ECMb fuse. Reduced power on these most times caused by a bad connection at battery. It is a 4 wire and the outer two wires test the same as #1. Could anything besides a bad PCM cause the PCM to not send the ground signal to fire # 4 injector only ? Towed home and found the battery was "bad" (atleast this is what the guy at parts store said). If it ran before . 6L - truck wont crank all lights come on, battery is good . Wiring or injector bad. . The ignition switch has multiple contacts in it that feed many things if the engine is on its own it may be a place to start. Anyone had a 22re ECU go out? Dec 20, 2018, 12:21:10 PM Welcome Guest, Please login I had a similar problem with my 85 pick up, found out it was just a bad engine ground. Generic TBI Fuel Injection Block Diagram & Acronyms The MAP Sensor has a three wire connection to the ECM consisting of a 5V reference, ground, and a signal wire This could be many things before suspecting a bad ECM. An ECM is a computer that monitors and controls the engine. 0 aw4 sye out of an 92xj. Consider taking the vehicle to the a General Motors approved mechanic. If there is a ground at this point, the wire is bad. and 2 that bolt to the back of the head. Ecm ground location 19 chevy tahoe one of the key ponents of the mefi 4 controller upgrade is the inclusion the j1 4 connector is the ecm ground but on the 4 it is for the emergency stop switch another ex le on the j2 conne we mounted the ecm for the cluster under the dash summit racing one way check valve to prevent fuel drain back pn sum Feb 26, 2012 · My uncle works as a auto tech for years and said these ECM's rarely go bad if at all, its a basic system, with a prom chip and unless you intentionally short the ECM and fry it, it shouldn't be bad. The solenoid should click. Ground for the ECU and ground for the headlights is under that screw (three wires in two crimped ring connectors. pickup coil . ign. The wide range of the ECM motor, high efficiency, and programmability gives it a virtually unlimited range of performance characteristics. Maybe the check valve at the brake booster making a big intermittent vac leak or the ignition module not getting ground. you will most likely find a corrided wire that is so bad you can pull it in half. At this point I think it is a bad ECM, but after reading this thread, Im second guessing myself. But you may get symptoms of stalling,lack of power,bad fuel milage, and many mor … e things that just don't seem right. • Connect a ground strap or cable (minimum of a 0 Ga. So I take it to the dealer and they think it's electrical power issue so they 'Install Stabilant 22A to connector' and tell me if it comes back again it may be a bad ECM and might need replaced at near $1400 including labor. Mike Thomas. W. As far as grounds go, every ground that I came across when swapping the motor was sanded down and cleaned up. 8 liter On my 3. There is a block that some "genius" made to ground the power windows, door locks, and seats. It is the central control unit of most vehicles and controls a variety of functions, such as electrical system power distribution, emissions, ignition, and fuel systems. I will look for a few more though. Fuel injectors do not spray. Some issues that I think may be related to a bad ecm. If the wires are in good shape, that headlight will be nice and bright. This practice is unsafe and may cause personal injury, death, or property damage. Take it out, attach a ground wire to the mounting plate and move the arm manually to make sure the gauge responds as it should. Dealer wanted almost $2500 for the new pcm and coils and new keys. One ECM is called the master, while the others are referred to as receivers. ECM – Electronic Control Module – this is the brain of the system that collects input signals from multiple sensors, makes decisions and sends output signals to deliver fuel and spark to the engine. wire) from the engine to the chassis (frame). Right frame rail, inside the wheel well. the ignition module/pickup coil in the distributor to get the ECM to ground the fuel injector circuit. 8 in center pin with key off and 11. This is a ground to turn on the light. First off, don't confuse replacing an ECM with repairing one. module. Most of all when jumpin the ecm connector under the dash I can no longer get the ecm to go into test mode and blink the trouble codes. The distributor will send a string of pulses to the ECM (Engine Control Module) in response to the engine being rotated by the starter. Remanufactured Dodge PCM ECM ECU TCM TCU Control Module Computers Chrysler PT Cruiser PCM ECU ECM TCM Save $100's Today! No Programming or Dealer visit is necessary. dipstick , Mar 14, 2012 Rather than seeing a ground with the key at ON, that will either flicker at crank (ie, good ignitor, bad coil) or go completely out (bad ignitor), I have no ground whatsoever. Inl Scribd is the world's largest social reading and publishing site. youtube. Ecm controls ignition. Share this post. Buick LeSabre Engine Control Module (ECM) can fail - 55 reports. I should have VERY good grounds haha. Somewhere there is a bad connection, crossed wire, defective sensor, bad ground etc. Why the computer flags this code. equipment level ground fault circuit protection (30mA), not the Class A type “people protection” ground fault protection (5mA). one up near the thermostat housing. theslab Proven Member. Corrosion can enter Another issue that can cause failure in the ECM is poor grounding. Here are some wiring diagrams and a guide to help you see how the system works and a guide to help you run some simple tests. Checked the OEM wiring harness going to the ECM. Truck turns on fine but will start to stutter when I hit the gas. com/common-reasons-failure-engine-control-modulesFeb 8, 2018 Another issue that can cause failure in the ECM is poor grounding. A bad jump can also blow out 2 amps which are located between the Jan 7, 2016 The engine control module (ECM), also commonly referred to as the A bad or failing ECM may produce any of the following 5 symptoms to If the ground connections in the engine compartment are bad, you can chase Here's an example of a bad ground on a 2001 Ford Ranger that was fixed by Sep 25, 2016 If you do not have 5 volts coming out of the computer, the computer is bad. The end result might be the same -- you can drive your car again, after all -- but engine control modules and units do sometimes go bad, and they aren't really designed to be repaired -- at least, not by the owner or by an average mechanic. ECM – Electronic Control Module. World's leading marketplace. A bad solenoid or short in the wiring can easily fry drivers inside the ECM, which the ECM itself will not detect. A5- brn/wht- SES(service eng soon) light. Below the battery, inside the right frame rail. All Chrysler PT Cruiser Computers are Plug n Play I have exactly the same problem with the same codes. Ensuring proper ground across critical engine connections reduces the potential for confusion. 2006 Xterra with bad Electronic Control Module (ECM) We just purchased an '06, trading our '03 up for a new model. Battery was 6 years old; so, replaced with new battery. If he grounded the wire there and it did NOT start, that would seem to indicate a faulty relay and/or open in the ground for the control side of the relay, not a faulty ecm. 11-19-11 11:11 PM - Post# 2159855 In response to ggenovez The wire going from the gauge to the sender is going open circuit (ie there is a break in the wire somewhere, or a bad ground on the tank sender). and it didn't work. e. Sometimes, more than one circuit can be damaged causing multiple symptoms. The ECM is a single a component, located behind the dash on the passenger's side. This wire may also ground thru the computer. If you need a Ford ECM not listed here, call us to check availability. Sensors getting misread cause all SORTS of readings cause the motor thinks it's hot when it's not, that it's rich when it's lean, etc. The 95 I have never threw a code with the bad coil or the real bad intake leaks it just ran like crap and had a surging The ECM assigns each fault and malfunction a code, which corresponds with General Motors standardized descriptions. trace the wires from the ecm power relay down toward the starter and battery. Still would not start and found the fuse the the ECM blown. The PCM does a voltage drop test of it's own at the TPS so it knows where the throttle is, and the speed of its movement, based on the voltage amount and speed of change it see's across the resistor inside the sensor as the wiper moves over it. Description Chevrolet ECM Repair Electronic Control Module Repair. That would probably be the same as the S for the ecm ground, which is probably under the seat somewhere. never ground. com/youtube?q=bad+ecm+ground&v=AdhxQUHnos4 Jun 21, 2016 I already figured it out, this was a loose PCM ground wire (on the negative battery terminal wire). Scan Position troubleshooting hints Although the ECM monitors the sensors constantly for out of range readings, some sensors do age and their readings gradually change, which is something the ECM can not detect. In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth. This is why you will have to either bring your Mercedes to our shop or mail us the original engine control unit so we can extract all the necessary information required to program the new unit. sounds like truck is in limp mode due to a bad ecm/computer. I got my hands on a good used one for $80. You want to check that the ECM makes a ground for the oxygen sensor heater circuit when the oxygen sensor (and engine) are cold. 1989 chevy g20 with 350 tbi. GoECM offers Chevrolet ECM with a lifetime warranty. The usual symptoms associated with a bad ECM are Ignition or Injector issues, Idle Air Control issues, no communication and such. ECM Ground & 5 Volt Interactive Wiring - YouTube www. The second I deprived the wire from a good ground, no spark or injectors. You might have a bad ground, causing voltage problems to the ECM. See how it's dome using a 20 OHM resistor and  Common Reasons for Failure in Engine Control Modules - J Ball jballelectronics. It last 8 years before a fused trace on the control module and two drivers burnt. It may come into play. 2. P0135 Oxygen sensor heater control circuit Bank 1 Sensor 1 No you can not , the 02 sensor receives power through a fused circuit, It is the ECM that sends a ground signal to the 02 sensor , The ECM uses ground signal to control the heater circuit IL04915001E Effective 7/09 2 For the CT supervision feature to work a 500:1 ratio Series A2 C311CT must be installed, as specified in section 5. With volt meter in hand I quickly back probed the three separate red ECM power wires and the two black/white ECM ground wires. This will stay on for 3 to 5 seconds after trying to start the engine if you keep the switch ON (AS IN TEST 4). HARDWARE AND WIRING 3. with a 33uf capacitor that is used to ground pin 19 and ground the coil. Original Closed Caption Available) Amazon Printed-Books & Kindle:  Loose PCM ground wire symptoms - YouTube www. Adding wiring for a bed winch -- fuse and ground location questions. Signal wire is the varying voltage between 0 and 5Volts as the pressure changes the resistance thru the sensor and its signal voltage. DIY Auto Service: ECM PCM Computer Sensor Diagnosis and Testing. February, 2012 My son and I have had a terrible time with our Ford Ranger. 00 volts), also from the ECM through the dropping resistor inside it. A 89 yj with a 4. That was the first thing I checked - continuity and short to ground. com/youtube?q=bad+ecm+ground&v=eSL6lj4Bj98 Jul 25, 2018 ECM Ground & 5 Volt Interactive Wiring Testing, using the interactive wiring diagram system. 2 with key on using the red probe at the pos batt cable and black touching the metal recessed in the connector. A broken or loose ground wire can cause all kinds of problems and failures. or throttle body wiring messed up. Unplug connector at ECM , no longer continent to ground. Therefore, during the installation of an AFCI, If the ground and the 5v reference are good, and your TPS signal voltage will not get down around 1v, you have a sticking or bad TPS. ECM Ground Strap Electronic Control Module (ECM) ECM Vehicle Harness Connector J1/P1 LEFT SIDE VIEW ECM Engine Harness Connector J2/P2 . Jan 02, 2011 · If that is typical, then the ECU must have the ability to break the continuity on the ground side in order to pulse the injector. All Dodge Ram Truck Computers are Plug n Play Duramax LMM DPF and ECM Programming Do’s and Dont’s Last updated 3-18-10 The release of the LMM Duramax has brought forth new emissions and new forms of tamper detection Doing some research found that the PCM/ECM has no protection for a bad coil. That would be one of the few things that would cause so many issues at once. Yes I agree , my first check was the battery box all the fuses and checking pins then checked voltage at ecm relay , --I just checked power and ground to connector 6020 (at the ecm ) from the clean power circuit found had battery voltage and ground at all pins that were fed by clean power circuit An easy example is attempting to draw 10 amps through a bad ground with a resistance of 1 Ohm. MAF/IAT sensor connectors do go bad. I posted a while back in the 911 section and have replaced lots of parts--AirDog fuel filter and pump, MAP sensor, many ground issues with wiring 2005 Jeep Liberty 3. It seems my ohm meter doesn’t pickup a ground, but interjecting a small test light current into the ECM does. 4431-Idle Air Control Valve. Mar 15, 2010 · To check your voltage you need to check from pin 24( +8v) and pin 4 ( ground for the sensors) This is off the ECM. This is not supplied by the ECM, but from the component. You can bare slip a finger up to feel it but as for inspecting it you can't do it with the starter in To determine whether it is the ground wire or the ECM, you will have to locate the ECM, pull the electrical connector off to it (Be sure and take the negative battery post off, first. If it turns out to be something simple like corrosion on the ECM, or a break in the signal wires in the EC harness it can easily be fixed. One is the ecm ground wire and the mercedes ecm is the ignitions primary other system. 1 MULTI-ECMS Engines with more than eight cylinders operate with multiple ECMs. A bad ECM may lead to a vehicle that won’t or is difficult to start. The bad earth/ground can be traced to an essential ground strap on the front upper transmission bolt. The O2 circuit is then grounded through the inside of the ECM electronic board by this ground wire. 4411-4414 and 4421-4422 (VR6)-Fuel Injectors 1-6. A =LOT= of wierd engine behavior is caused by poor grounds, especially on early XJ's! Using CAN communication line, it receives signal from ECM and controls cooling fan relay. Ground (ECM Supply Return) is pin 1 on the 4 pin plug. Now go to the ground terminal(s) on the vehicle and remove the nut or bolt that holds the terminal eyelet(s). Don't bargain shop for a part that you and your family depends on! module (ecm) modulegods by ecu team corp, ecm engine control module an engine control unit (ecu), also commonly called an engine control module (ecm), is a type of electronic control unit that controls a series of actuators on an internal combustion I had my mechanic look at it and he said one ignition coil was bad (in front) which he replaced but also suspected the Engine Control Module (computer) was bad. Bad ECM? This is a discussion on Bad ECM? within the Ranger XP 1000 Discussions forums, part of the Polaris Ranger Forums category; Ok guys was riding at Go Topless this weekend at Crystal Beach first off get down there ranger battery is dead. This also has stopped the random pinging which must have been caused by the bad internal ground and the transmission not being able to retard the timig during the shift properly. This can be the result A bad jump can also blow out 2 amps which Jan 7, 2016 The engine control module (ECM), also commonly referred to as the engine control unit (ECU) or powertrain control module (PCM), is one of Set a DIGITAL VOLT METER to its 1 volt DC scale and connect the negative meter lead to the negative battery post. Check the When the switch toggle is pressed away from the key notch of the switch (left), it applies a ground to pin C2-1 of the ECM, which enables the base tune. The CTS pulls down (towards ground) the voltage reference signal based on temperature and the ECM looks at the amount of voltage pulled down and uses this to calculate temperature. Left footwell, behind trim panel. Fuel Pump And Ecm Relay Fixes. 30A reading AND THE ECM POWERS ON AND I CAN PULL CODES!!! ground for the EGR, Baro, ACT, ECT, & TPS sensors as well as the ground to put the computer into self test mode. 4343-Evap Canister Purge Regulator Valve. Bad ECM? I got my 88 XR7 wired up, completed the maf conversion wiring, and wired up a NGS and a css in the pin 30 and 46 circuit. With the electrical connector connected, put a multimeter back-probe to the ECM oxygen sensor bank 1 heater terminal 49 to read voltage. on my transformer on the 24 volt side I had 6 volts and on the common side I had 17 volts as it turned out I had a bad ground once I fixed the ground wire my transformer now has 24 volts and my common wire has 0. Has anyone out there heard of the possibility of a bad ground (to the engine) that can affect the computer (ECM), and cause the engine to Jan 24, 2012Jun 21, 2016Jul 30, 2015 I can ground it right to the connector in the ECM and it will run great. if it was ecm would not start. I do have a good ground on the distributor body, and I have done the "Ignition Control Module (ICM) Input Test" from page 4-19 of the service manual. Check the wiring diagram of the ECM - I think there's more than one ground pin. If the ground connections in the engine compartment are bad, you can chase Here's an example of a bad ground on a 2001 Ford Ranger that was fixed by I already figured it out, this was a loose PCM ground wire (on the negative battery terminal wire). Now the hard part is done time to get it up in the air just a bit. I'm pretty sure I got a bad ECM as when I insert a test lamp between voltage and heater control the lamp doesn't illuminate when the engine is running thus the ECM is not commanding ground to the HO2S. Average repair cost is $890 at 72,150 miles. The wiring harness with the woven plastics strands will sqeeze the bundle of wires together, add some oil of fuel and the insulation on the individuals wires is softened and can make contact with the other wires in the bundle. usual causes. Cost me a new fuel line system to realize it was a bad ground and The current problem that I have is the way I wired, it appears that the Ecm is not switching the ground, as such, the new relay for the low pressure pump is on continuously. avi - YouTubehttps://www. This is mostly caused by a bad ground on the sending unit. A good OBD II code reader/scan tool should be able to tell you if the PCM is seeing these cam and crank signals. You might also want to try putting a ground at the ECM connector wired to terminal (B) (white connector pin #3 in 84). Flagship One, Inc. Engine Control Module (ECM) The ECM, or ECU, controls various engine operations in your vehicle. • Connect a ground strap (minimum of a 00 Ga. Some of these codes pertain to the ECM itself. Well I was right I got another ecm with the prom in changed it out and IT WORKS!!!! after three weeks of checking wires and researching. Sent the ECM the repair shop and agreed on a bad ECM. The bad practice, of using a jumper wire from battery or ground to ECU output pins. To have a new ECM installed is gonna run me around $400 which is why I'm trying everything else first. (optional) This is a ground from the ECM to control the EGR relay. the computer is bad. With the cobalt though the power steering is electric so it has things run through there as well and was the reason for the recall that is why I had all 3 replacedAug 06, 2012 · Hmmm, OK. and also controls operation of electrical components through the ECM, BCM and CAN communication lines. Nov 29, 2010 #1. Ground circuit either to a chassis ground or grounds back thru the computer. you must be missing something. C4 Corvette Computer Modules(ECM) (1984-1996) Count on Zip Corvette for the best quality Corvette Parts available for your 1984-1996 Corvette. com/watch?v=8MpRWyev5F0Mar 29, 2011 · PCM power and ground testing. Sometimes the float arm of the sender is not able to move freely inside the tank (hitting side of tank or baffle). J1939 (H) DATA LINK is a yellow wire on pin 46. O2 sensor failure causes a DTC or diagnostic trouble code. If the ground fault is an arcing or intermittent type, there is possibility of substantial transient overvoltages, which can be six to eight times the phase voltage. . If the ECM fails completely, it will leave the vehicle without engine management control, and will not start or run as a result. Bad TPS Ground Voltage Drop testing sensor grounds. Try to find an ECM from the exact vehicle as you have. PCM power and ground testing. ECM number 16198259 is equivalent and can be used in its place without any problems. To do this ground the diagnostics terminal and start the engine. I definitely have a bad ground somewhere, but I do not have the time to rip apart my interior, so it will stay grounded to A bad jump can also blow out 2 amps which are located between the ECM and the firewall. ProTech Auto Systems is your trustworthy supplier of all ECM, PCM and ECU Dodge Auto Computers. The ECM can adapt its programming to meet changing operating conditions. Bad ground, voltage surge, moisture, big hammer, who knows. Find great deals on eBay for Silverado ECM in Engine Computers. Bad ECM ground or bad ECM? When I checked the voltage at the O2 sensor, I just grounded to exhaust manifold, so maybe the exhaust manifold is not grounding properly. The engine control module (ECM), also commonly referred to as the engine control unit (ECU) or powertrain control module (PCM), is one of the most important components found on virtually all modern vehicles. We now have a double effect causing the ECU ground to sit higher than the engine ground. I'm going to trace the chassis ground on the OBD2 connector - and GOOD NEWS - if I measure the amp draw between the chassis ground on the OBD2 connector and an actual chassis ground, I get a . Hey I had to have my PCM replaced 2 times and ECM as well and the steering column bc of all my electrical issues, radio, power steering, all my gauges on the dash my transmission etc. So V=10(1) thus making the voltage drop a whopping 10V. The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions. It makes sense that ECM uses some current since it needs a hot-wire all the time maintain it's memory, but how much? Do I have a short in my ECM? By the way, I did my best to isolate the ECM, when I plug-in the 7-pin connector to the ECM, I get the 10V measurement. Reading 12 Volts off a wire that is not loaded is not bad, but if the loading device has been jumped around then then when the computer goes to ground the circuit there will not be a voltage drop across the loading device coil. With the OEM connector disconnected at the ECM, jump power one at a time from pin 4 and 6, through a headlight bulb, then ground the headlight to make it come it on. 0 aw4 sye out of an 92xj. The ECM is almost never JUST BAD, unless you have some reason to suspect that it may have been compromised. Volkswagen Jetta Difficult to Diagnose Electrical Issues Are Typically Due to Ground Issues - 175 reports. But you may get symptoms of stalling,lack of power,bad fuel milage, and many mor … e things that just don't seem right. Save $100's Today! No Programming or Dealer visit is necessary. 8 liter, I have checked all sensors, coil pack, plugs, wires etc. Volkswagen Jetta Difficult to Diagnose Electrical Issues Are Typically Due to Ground Issues - 175 reports. 1v at O2 sensor, and post the results. If your reference voltage is too high, you have a bad ground or a bad ECM. When i buy it, ses light didn't worked. Joined Sep 14, 2010 if you do any sensor work with the battery connected and short out the connector to the sensor by touching it to ground, it can blow a ground bus in the ECU. P0657-Bad ECM? Discussion in ' This is looking up from the ground at the switch assembly. The one thing I can say if the computyer is not communicating, the light no longer comes on dash, and you do not have all the things mentioned, this near 99% leans to power /ground problem at ECM or Bad ECm but. the whole distributor is Also with grounding the diagnostics terminal to ground you can observe the operation of the O2 sensor and the switching from lean/rich by the ECM. I took it to my mechanic and he told that it was short to ground, and he is unable to pull codes until that is fixed. The vast majority of ECT sensors are of the 2-wire type. These are connected on one side to an ECM provided sensor ground and the other side to a reference line (usually 5. If you get a low voltage around 9 volts, they are not happy! All the codes that you have. The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions. The opposite side of the relay that wire connects to should connect to 12v. I need to check the ground on the ac tomorrow. Shop with confidence. Water can also be blamed for causing units to fail, we understand the need for some of these engines to be pressure washed but you have to consider the problems it can cause. The bad practice, of using a jumper wire from battery or ground to ECU output pins. I agree with you that by letting unhibited current flow to that circuit was a very bad idea and should have used a led test light in series with the control circuit to protect the ecm, do you think its possible that by doing so allowed enough current to jump the open driver or ground contacts in the ecm initially? Common Symptoms of Bad Engine Control Modules There are various symptoms of a failed or failing ECM depending on what circuit is damaged. I've checked for power to the ignition to pin 70. Connect a ground strap or cable (minimum of a 4 Ga. (The Computer) Computes the spark advance for proper ignition timing and fuel control based on sensor inputs (from CKP, MAP & TP sensors) and controls the low-voltage circuits for the ignition coils and injectors. The other wire from the MAT sensor needs to be plugged into pin #C-11 (tan) at the ECM, this is where the wire from the other car came into play. Re: Why Does ECM/PCM Go Bad? I remember when I bought my 88 in 88 I went thru 2 proms within the first 3 months. I know this effects quite a few people, and many have simply wired in a new ground. Possible bad PCM/ECM resulting in P0300 misfire 3. This is probably a bad ECM. An open or short to ground in this circuit will set the code and cause the engine to run on ignition module timing. To test the ground wire, power the meter on one lead and check the Cadillac Fleetwood Performance Issues Due to Faulty ECM Grounds at Front of Engine - 12 reports. If you can get your hands on another ECM, try swapping that in and see what happens. There may have been a problem with the ground at the ECM terminal, or a break in the circuit, and running the wire to a local ground fixed the problem. I ran the truck for DTC's and no codes were found and the readiness monitors checked out. I saw another thread just started regarding bad ecms, and I didn't want to hijack it, so I figured I'd throw my own on here to get some input. The ECM supplies the CTS with a ground and a small voltage reference signal. What is not working correctly, in this case, is the electrical circuit or sensor the ECM is monitoring. ELECTRICAL SYSTEMS WIRING DIAGRAMS. My question is, I don't think it's the wire that is the problem since I can put it Jan 7, 2016 The engine control module (ECM), also commonly referred to as the A bad or failing ECM may produce any of the following 5 symptoms to I'm pretty sure I have a/some bad ground(s) causing 12 volts on a number of ECM sensor ground pins that should be reading 0 volts, most gauges not working, Corrosion or damage due to moisture is one of the main reasons for ECM failure. so now i guess i gotta look at the fuel pump relay circuit to see if any irregularities are in the wiring harness or maybe rust on the ground wire. bad ecm power wire or ground. In my honda book it says code 0= bad ecu. With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. My check engine light just stays on, and when I jump the data link connector Im not given any codes. I would not want to fail the new one though. Hello. ), then locate the yellow green wire at pin #106 of the ECM electrical connector. so, got the new ECM today, plugged it up and ran like a champ. 5/5(8)PCM power and ground testing. sensors) and some key internal variables, but it does not check the output side (bad drivers, or defective solenoids). The throttle position sensor is a simple potentiometer that uses ground and 5-volt reference inputs to produce a varying output signal depending on the position of its detection arm or shaft. According to the service manager at my local Nissan dealership, it's highly unlikely that all 4 oxygen sensors would go bad at the same time so the problem is likely to be a bad ground connection. 7L. Perhaps this suggests something like blown diode, but I hate to speculate on such things for lack of electronic knowledge. Does anyone have a flow chart for this? Suspect bad ECM but that is a little more then I would like to through at it on a whim? A bad jump can also blow out 2 amps which are located between the ECM and the firewall. bad or clogged injectors Or bad ecm. Getting a refurb PCM is a 50/50 shot at getting someone elses bad core PCM as your $300 replacement. A floating ground configuration is illustrated in Figure 22. I also revised my earlier post, for any reason 2 sentences got lost. If that was a problem swapping the ECM would not have solved the problem. GoECM offers Ford ECM with a lifetime warranty. A good way to test grounds is through a voltage drop test. wire a connection. I am curious as to why you suggest cleaning my MAP sensor and other sensors on the engine. Something to try if the other suggestions don't pan out. Our engine control modules are inspected, tested, and guaranteed. Recovering the C4 ECM/PCM Codes. When toggled in the other position (up), the switch removes the ground, which enables the secondary tune. 3 ECM motor failed on a Carrier furnace. CAN COMMUNICATION LINE CONTROL With CAN communication, by connecting each control unit using two communication lines (CAN L-line, CAN Either a bad ground or a bad ECM. If not, check the wiring diagram to find where the wire is grounded. Feb 12, 2014 · I am now concerned that I may be buying a truck with a bad ecm not the vp44 as I originally thought. wire) from the negative battery terminal to the chassis (frame). LOL DM I wouldnt say none of those things apply to our trucks . If you get no response, bad ECM or a bad wire/fuse going to or from it. My DSM: 1990 Plymouth Laser RS Turbo Jun 15, 2012 · If it turns out to be the ECM, then the next question I would be asking is why it failed. If this module fails or works erratically, then the Chevrolet's whole diagnostic system becomes untrustworthy. If you get no response, bad ECM or a bad wire/fuse going to or from it. Aug 19, 2018 · Bad ECM ground or bad ECM? When I checked the voltage at the O2 sensor, I just grounded to exhaust manifold, so maybe the exhaust manifold is not grounding properly. it has been changed. Now all wires and bulb are okay but that ecm brown/white wire wont ground bulb. Each sensor and every device controlled by the computer requires a good ground. The PCM can't operate properly if it does not have a good source of power and a good ground. The ECM wire supplies ground, not power. has to be either a bad ground. Quality ECM, ECU, EBCM, IDM, FICM repair, rebulider for all makers. 5. A loss of knock sensor signal or loss of ground at the ESC module will cause the signal at the ECM to remain high. Battery ground. By grounding there the ECM was taken out of the equation. One being a ground from the ECM, the other being the resistance to ground signal back to the ECM. A thermistor is designed to short the signal wire to ground through a resistor. Check these ground locations: Right inner fender, behind the battery. bad ecm power wire or ground. Since the chassis ground lead is a smaller gauge it can't handle the high current the short caused and so it burns up the wire due to the higher resistance of the wire. you will notice that there are 3 ground connections. Have you verified "all" the ground wires to the engine harness were installed after engine instalation to the boat? Also, there is no service mode to worry about with this style distributor. loose one and stuff stops working. Diagnosing voltage drop mon ground. Does cityx suffer the broken ecm like some Uly did? The grounds get dirty, and could get corrosion inside the crimped connector. Let’s assume the grounding to the ECU from the battery is also substandard, which means that as injector duty cycle increases, the voltage drop between the ECU and the battery also increases. The coil and injectors are powered up (+) at 'key-on' and the PCM controls the ground (-) sides of them for both spark and fuel to the right cylinder at the right time. yeah this is not an ECM issue, you have a main power wire issue, or ground issue somewhere probably no power to ECM due to a burnt link or fuse or bad connection Ungrounded system showing phase-to-ground-to-phase fault and ground-fault current path. Bad TCM, BCM, PCM, or ECM?? HELP!!!! each of the modules one by one and pray you did not take out the pcm. Alarm horn, engine compartment wiring harness ground 1 (coil packs, after-run coolant pump (VR6 only), vehicle speed sensor (manual transmission only)), engine compartment wiring harness ground 2 (engine control module, brake system vacuum pump (automatic transmission only)), automatic transmission wiring harness (transmission control module code sets if the ECM detects a problem with the Vehicle Speed Sensor circuit (possibly from a bad sensor, open or shorted circuit, wiring problem, bad connection, or a problem with the speedometer). The engine flexes and the wires just break internally sometimes. Followers 0. Besides investing the ECM's external wiring, you can either reprogram it or replace it. The ignition module and the computer are in constant communication when the engine is in operation. Special Price: $225. 100 1. Right of the left cylinder head. Is it possible to ground somewhere else or is it necessary to run ground all the way back to ecm. If not repair the ground. Ill post the VAG-COM results soon, but I have all injectors, the EVAP purge, and secondary air pump faulting to ground. What we have here is a failure to communicate. Car has been me about month. 0 a/t, is the ecm done? - Answered by a verified Toyota Mechanic If the ground connections in the engine compartment are bad, you can chase problems across a variety of vehicle systems for hours and still not properly diagnose the root cause. If this ground is bad, none of the sensors mentioned will work properly. The original ground comes from two engine grounding points located at the There is a big difference between an ECM that is bad and an ECM that is simply being fooled. The inner 2 wires I don't know how to test to see if the signal is getting to the ecm. Whether or not you are looking for a Remanufactured Chevrolet ECM tomorrow or looking to send yours into be rebuilt we have your solution. This is a list of the more common OBDII codes, along with the possible cause or causes of the code. But I got this for every single injector on my GLX, and they were fine, so maybe this code pops up if you run the tests for too long with the motor off