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How to fix pcm that gives no output to ignition coil

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If you have a coil driver issue with the PCM, you will have to replace the PCM

Posted on Feb 23, 2012


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Posted on Jan 02, 2017


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Where is camshaft position sensor on 2002 Pontiac grand am se ecotec 2.2

This vehicle does not have a cam sensor .The ICM provides a synthesized cam signal to the PCM based on these inputs. The PCM uses the cam signal to synchronize fuel injection.

The powertrain control module (PCM) supplies a signal on each of the ignition control (IC) timing control circuits to the ignition control module (ICM). The ICM fires the correct ignition coil at the correct time based on the signals. The ICM detects if cylinder 1 or cylinder 3 is on the compression stroke by sensing the secondary voltage and polarity of each side of the ignition coil. The ICM detects this voltage with sensing circuitry integrated into each ignition coil. The higher voltage is on the compressing cylinder. This is called compression sense ignition. The ICM provides a synthesized cam signal to the PCM based on these inputs. The PCM uses the cam signal to synchronize fuel injection.
This system consists of the following circuits:
• An ignition voltage circuit
• A ground circuit
• A camshaft position (CMP) sensor signal circuit
• An IC timing control circuit for cylinders #1 and #4
• An IC timing control B circuit for cylinders #2 and #3

DTC P0340
This ignition system does not use a conventional camshaft position (CMP) sensor that detects valve train position. The ignition controls module (ICM) detects when #1 or #3 cylinder has fired on the cylinders compression stroke using sensing circuitry integrated within each coil. The sensing circuit detects the polarity and the strength of the secondary voltage output, the higher output is always at the event cylinder. The ignition control module (ICM) sends a CMP signal to the powertrain control module (PCM) based on the voltage difference between the event and waste cylinder firing energy. This system is called compression sense ignition. By monitoring the CMP and crankshaft position (CKP) signals, the PCM can accurately time the operation of the fuel injectors. If the PCM receives an intermittent CMP signal from the ICM, the CMP Resync Counter on the scan tool will increment. When the PCM cannot use the information from the CMP signal, a DTC will set. DTC P0341 sets when the PCM detects too many CMP Resyncs within a certain amount of time.

Jul 13, 2017 | Pontiac Cars & Trucks

1 Answer

2002 tracker what causes it to stall out going down the acts like its missing out and dies

What engine does it have ? 1.6 L , 2.0 L , 2.5 L . A crankshaft position sensor , coil pack , I would say that you have an ignition system problem . The only way to know for sure is have it checked .Go on youtube an check out some videos on trouble shooting ignition systems from scanner Danner ,he is a teacher of automotive engine electrical diagnostics . Then go to for free wiring diagrams an do some voltage tests. The PCM uses reference pulses from the CMP sensor in order to determine engine speed. The PCM cannot operate the ignition system, or the fuel injectors, without the engine speed signal from the CMP.
The ignition coils supply spark to 2 engine cylinders, and spark plugs, at the same time. When the PCM signals the ignition module to interrupt the current flow in the primary coil windings, the electrical field around the primary coil collapses and a high voltage is induced in the secondary coil. The secondary coil voltage travels simultaneously from both coil output terminals, to the spark plugs, and across the gap of each spark plug to the engine block. The CKP sensor signal is used by the PCM for engine misfire detection.

Jan 26, 2016 | Cars & Trucks

1 Answer

I have a p2323 code and replaced the spark plugs. I pulled the battery cable and after a week the code came back. What could be causing this.

P2323 Dodge - Ignition Coil Secondary Number 8 Circuit Condition - Faulty spark plug or coil boot
- Faulty Ignition Coil 8
- Ignition Coil 8 harness is open or shorted
- Ignition Coil 8 circuit poor electrical connection
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine may be running rough

P2323 Dodge Description
The ignition system is controlled by the Powertrain Control Module (PCM) on all engines. Each cylinder is equipped with 1 dual-output coil. Meaning one coil mounts directly over one of the dual spark plugs for 1 high-voltage output.
Battery voltage is supplied to all of the ignition coils positive terminals from the ASD relay. If the PCM does not see a signal from the crankshaft and camshaft sensors (indicating the ignition key is ON but the engine is not running), it will shut down the ASD circuit.
Base ignition timing is not adjustable. By controlling the coil ground circuits, the PCM is able to set the base timing and adjust the ignition timing advance. This is done to meet changing engine operating conditions.
The PCM adjusts ignition timing based on inputs it receives from:
- The engine coolant temperature sensor
- The crankshaft position sensor (engine speed)
- The camshaft position sensor (crankshaft position)
- The manifold absolute pressure (MAP) sensor
- The throttle position sensor
- Transmission gear selection
Read more:

I hope this helps!


Mar 17, 2015 | 2011 Dodge Ram Pickup 1500

2 Answers

My 1995 dodge caravan trys to start but wont im getting no spark to my spark plugs

Hi mate start at the easiest point which will be to check your EARTH to make sure everything is earthed.

Feb 06, 2015 | Dodge Cars & Trucks

1 Answer

30amp auto shutdown fuse blows is it alternater

The ASD relay supplies battery voltage (12+ volts) to the fuel injectors and ignition coil(s). With certain emissions packages it also supplies 12-volts to the oxygen sensor heating elements. The Fuel Pump Relay is a separate relay controlled by the ASD relay input to the PCM. Fuse #12 (10amp) provides 12 volts to the coil side of both the relays and the ignition switch. Fuse #6 (30 amps) supplies 12 volts to the output side of the relay. Fuse #16 (15 amp) from the relay output to the Oxygen Sensors and Fuse #26 (15 amp) relay output to the PCM. Fuse #24 (20 amp) is Fuel pump relay output to fuel pump. Fuse #19 (10 amp) supplies 12 volts direct to the PCM.
look for burned or melted wires in the offending circuit.
sounds like you wiggled a wire while installing new relay.

Mar 06, 2013 | Cars & Trucks

1 Answer

How do i fix codes PO355 and PO305

Trouble Code: P0305

Cylinder 1-8 Misfire Detected

Possible Causes:

ASD relay output 2 circuit fault.Injector control 1 circuit fault.Coil control 1 circuit fault.Ignition wiring, spark plug, or ignition coil faultFuel pump inlet strainer pluggedRestricted fuel supply lineFuel pump module fault.Fuel pressure leakdown fault.Fuel injector is damaged or has failed.Engine mechanical problems exist.PCM has failed.Trouble Code: P0355

Ignition Coil No. 1-8 Primary Circuit

Possible Causes:

ASD relay power circuit to the ignition coil is open.Ignition coil primary "driver" circuit open or grounded.Ignition coil is damaged or it has failed.
PCM has failed.Here are the codes and causes.What you can do is Go to Dodge dealer,get oil change and they will scan your vehicle for free and find problem and tell you and how much it will cost and you can decide to let them or go home and do it your self,but you will find out for free what the problem is,they have a reader that pin points the problem,on these others you can replace good parts trying to find problem.

Jan 06, 2013 | 2002 Dodge Durango

1 Answer

Chrysler sebring code p0513

P0513 stands for invalid SKIM Key. Basically it means that the "computer chip" that is in your ignition key which has a special code is not recognized by your vehcile compter (PCM). In most cases that I have come across is that either your VIN is not entered or is the incorrect VIN programmed into the PCM. Have you recently changed the PCM ? You may try another ignition key but I doubt that would work unless you are using the wrong key for the vehicle. You will need special diagnostic computer programs in order to correct this problem. Most likely your PCM will need to be "Flashed" to the VIN. This really isn't a weekend/backyard/part time mechanic fix. Hope this helps you to understand what the code is and what it means. Guessing the vehicle won't start.....

Oct 10, 2012 | 2004 Chrysler Sebring

1 Answer

How do I fix Diagnostic code 351

1. Check for power to the ignition coil when cranking.

2. Check continuity between the Powertrain Control Module (PCM) and the coil on the coil ground circuit wire.

3. Check connections at the coil and at the PCM.

4. If good, replace the ignition coil.

5. If the problem is still there, replace the PCM.

Jun 26, 2012 | 1997 Jeep Grand Cherokee

1 Answer

Remove coil pack

Ignition Coil Assembly REMOVAL & INSTALLATION 2.2L (VIN G and 4) Engines
  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle.
  3. Detach the assembly electrical connectors.
  4. Tag and disconnect the spark plug wires.
  5. Unfasten the three ignition coil assembly-to-block bolts, then remove the assembly from the engine. Fig. 1: Exploded view of the ignition coil assembly - 2.2L (VIN 4) engine shown 87952014.gif
    To install:
  6. Position the ignition coil assembly to the engine. Install the mounting bolts, then tighten to 15-22 ft. lbs. (20-30 Nm).
  7. Connect the spark plug wires to the proper coils, as tagged during removal.
  8. Attach the coil electrical connectors.
  9. Carefully lower the vehicle, then connect the negative battery cable.
2.0L (VIN 1 and H), 2.8L (VIN W) and 3.1L (VIN T) Engines NOTE: On 3.1L engines, an "Idle Learn" procedure must be performed which requires the use of a scan tool. You may wish to have the coil(s) replaced at a proper service facility.
  1. Disconnect the negative battery cable.
  2. Detach the electrical wires from the ignition coil assembly.
  3. Tag and disconnect the spark plug wires from the assembly.
  4. Unfasten the mounting bolts, then remove the assembly from the engine. NOTE: On the 2.8L and 3.1L engines, with the coil pack removed, each coil can be removed and the ignition module can be removed as well. Fig. 2: On the 2.0L engine, if any part of the ignition coil is faulty, the entire coil assembly must be replaced 87952013.gif
    Fig. 3: When the DIS of Ignition Coil assembly is removed, you can remove each individual coil for replacement - 2.8L and 3.1L engines 87952012.gif
    To install:
  5. Position the ignition coil assembly on the engine. Install the mounting bolts, then tighten to 19 ft. lbs. (25 Nm) for the 2.8L and 3.1L engines. For the 2.0L (VIN 1) engine, tighten to 89 inch lbs. (10 Nm).
  6. Attach the plug wires to the proper coils, as tagged during removal.
  7. Fasten the ignition coil assembly wiring.
  8. Connect the negative battery cable. NOTE: On the 3.1L engine, this test must be done before the engine is started and requires the use of a Tech 1® , or equivalent, scan tool.
  9. If equipped with the 3.1L engine, perform the idle learn procedure to allow the ECM/PCM memory to be updated with the correct IAC valve pintle position and provide for a stable idle speed.
    1. Install an appropriate scan tool.
    2. Turn the ignition to the ON position, engine not running.
    3. Select IAC SYSTEM, then IDLE LEARN in the MISC TEST mode.
    4. Place the transaxle in park or neutral, as applicable.
    5. Proceed with idle learn as directed by the scan tool.
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Oct 08, 2010 | 1992 Pontiac Sunbird

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