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Fuel pressure is right on and has good spark at plugs. No voltage at injectors. Need to determine if it is ECM or ignition module. 1992 chevy cavilier

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Check the input voltages to the ignition module. If they aren't what they're supposed to be, it's ECM or wiring fault. You need a wiring schematic to troubleshoot accurately on a problem like this.

Posted on Feb 18, 2011

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Posted on Jan 02, 2017

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1988 pont 6000 quit and would't restart. Generates 42 code. I have shop manual. Flow chart led to ign. module or ecm. I replaced both. The car idled for 20 min. and quit.


I don't know liter size of engine? I don't know exactly what testing you have done? I need more info?
You have dis ignition? Engine cranking, do you have spark at the plugs, proper fuel pressure and fuel injector pulse?
The purple wire with white tracer from ignition module to computer has a dc pulse with engine cranking? With bypass ignition, engine cranking, it's the ignition module that controls spark, during cranking rpms. Did you check voltage and ground for ignition module. With dis ignition, there is a crank sensor? I'm not saying replace anything. I would have replaced the --spark plugs and plug wires, Possibly the ignition coils.
I just don't know exactly what testing you have done?
If you have already done everything I suggested, then, pardon my post. Just trying to help.

Aug 25, 2017 | Cars & Trucks

1 Answer

05 Cad SRX. Codes PO261, PO 267, PO 273. Injector control circuit low. This is right bank on 3.6. Any ideas what to look for


Check fuse in under hood fuse box .Odd coils 15amp . This fuse powers both fuel injectors an coils on that bank.
The control module enables the appropriate fuel injector on the intake stroke for each cylinder. Ignition voltage is supplied directly to the fuel injectors. The control module controls each fuel injector by grounding the control circuit with a solid state device called a driver. The control module monitors the status of each driver. Each driver has a feedback voltage circuit which the engine control module (ECM) monitors. The injector control circuits are pulled-up to voltage within the ECM . The ECM can determine if a control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. If the ECM detects the control circuit voltage is too low when the circuit is commanded OFF, this DTC sets.
Shorted injector's ? Go on you tube an check out videos on testing GM injectors by scanner Danner . He teaches automotive training classes .
Injector Circuit Wiring Diagram

Mar 07, 2016 | Cars & Trucks

1 Answer

I have a 1991 chevy caprice that has fuel psi/spark and will run w/ aux fuel source being supplied. ijectors operat as designed when grounded. have determined they are not getting their ground signal from...


Well at the shop we would use a noid light .You disconnect the injector connector an plug the noid light in . This light will flash if the circuit is good . You could also use a test light hooked to the positive battery terminal ,then touch the point to the side that goes to the PCM/ECM . That's all the PCM/ECM is doing ,is suppling a ground . Oil pressure switch doesn't play any part in this . The oil pressure switch is hooked in parallel to the fuel pump relay . If the relay fails power can still make it to the fuel pump. Doesn't keep the vehicle from starting from low oil pressure . Plus if the injector's are not being controlled by the PCM , it could be the By pass circuit of the ignition control module . Could still have spark an have a bad ignition module.
GM Bypass Ignition System Operation part 1

Dec 25, 2017 | Chevrolet G20 Cars & Trucks

1 Answer

96 chevy blazer turns over but wont start


It needs at least 60psi fuel pressue to start. You need to check fuel pressure with a gauge.
If the dist cap or rotor is bad, the spark will not be on the right plug at the right time. Same goes for a faulty distributor or a problem with the timing chain. And the ignition module.
Also check the ecm for trouble codes.

Jun 29, 2012 | 1996 Chevrolet Blazer

1 Answer

2000 gmc 1500 p0300


I think the P0107 is the root cause of the problem.
P0300 is a random engine misfire on all cylinders.

Possible causes - Faulty spark plug (s)
- Faulty ignition coil (s)
- Ignition coils harness is open or shorted
- Ignition coils poor electrical connection
- Clogged or faulty fuel injectors
- Injectors harness is open or shorted
- Injectors poor electrical connection
- Improper spark plugs
- Insufficient cylinders compression
- Incorrect fuel pressure
- Intake air leak
P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input.
Possible causes - Manifold Absolute Pressure harness is open or shorted
- Manifold Absolute Pressure sensor poor electrical circuit connector
- Faulty Manifold Absolute Pressure sensor
- Faulty Powertrain Control Module (PCM) or Engine Control Module
(ECM)

Feb 02, 2012 | 2000 GMC New Sierra 1500

1 Answer

Trac off light came on and off then stayed on while driving, p0203p0204 p0300 codes when scanned with little machine better read open circuts in both injectors loss of power


P0203 - Injector Circuit Malfunction Cylinder 3

Powertrain Control Module (PCM) or Electronic Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The PCM/ECM will trigger the P0203 code when the resistance or voltage drop at the injector #3 is out of specifications.

Causes:
- Open or shorted wiring harness to the injector #3
- Bad injector #3
- Bad PCM/ECM

Solutions:
- If damage, repair injector wire harness or connector
- Replace injector
- Replace PCM or ECM


P0204 - Injector Circuit Malfunction Cylinder 4

Same info as the P0203 DTC


P0300 - Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak
- The ignition signal circuit is open or shorted

Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

Feb 03, 2011 | 2001 Pontiac Sunfire

1 Answer

I have a po 300 engine code random cylinder misfire i change cap rotor and wires problem still exists


PO300 - Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak
- The ignition signal circuit is open or shorted

Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

Jan 27, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

1999 chevy tahoe wont start and if it does it dyes rite away


That sounds like a fuel pump problem and you can test that by pulling a vacuum line off from the intake manifold and spray a lot of carburetor spray or brake cleaner in a spray can into the intake manifold through the open vacuum line port (it has to say "extremely flammable" on the can to work and the non-flammable will not work for this test) and then replace the vacuum line and see if the engine will start and run for a few seconds on the spray.

If the engine does start and run then the problem will most likely be the fuel pump, however a faulty ignition module inside of the distributor could keep the fuel pump from running or the fuel injectors from firing and if there is good fuel pressure in the fuel rail, (there should be a schrader valve in the fuel rail for testing) and there is spark out to the spark plugs but the engine still will not start, then the ignition module inside of the distributor would be the likely suspect of the problem.

If the engine does not start then you will need to determine why there is no spark to the spark plugs, and most likely the problem will be the ignition coil or the ignition module inside of the distributor, or there could also be a problem with the ECM (Engine Control Module).



Jun 12, 2010 | 1999 Chevrolet Tahoe

3 Answers

I have a 1992 chevy lumina z34, its not getting fuel to the injectors or the injectors or opening. I have fuel pressure. up to where you check for pressure on the fuel rail. it just died when I was driving...


Have you checked that engine oil level is okay, if so check that oil pressure switch is good. The switch is usually bypassed to start the engine, but it won't run with no oil pressure indicated...hope this helps

Oct 07, 2009 | 1992 Chevrolet Lumina

3 Answers

My car is not firing . i replaced the ignition controle module and it's still not firing.


You need to 1st determine if the computer is even trying to start it before you start lobbing parts. Look at the CHECK ENGINE lamp while you crank it. If it stays on bright while cranking, the engine will not get any signal to fire spark or fuel because the computer is not seeing RPM signal while cranking. If the light goes OFF while cranking, the crank signal was seen, however there could still be fuel or spark issues from other causes. You really need to determine if you have spark or fuel as the next step after verifying rpm signal. There are no cheap tricks for most of this work, it takes tools and training to determine the exact cause of failures. Does the ECM communicate? Is the EEC relay functioning, does the fuel pump prime up at Key On? Is there injector pulse? Fuel pressure? 30kv of Spark that is also reaching the plugs?
These are the steps to check to determine how to not buy a wasted part as the next step.

Sep 15, 2009 | 1993 Ford Mustang

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