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P2302 How to confirm bad PCM?

 
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Old 02 Dec 2017, 07:45 pm
Trackrash's Avatar
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Default P2302 How to confirm bad PCM?

Hello, I'm new to this forum and am hoping I can get some answers. TIA

Background: Original owner of an 04 PT. 130K miles. New plugs and wires at 120K.

On the freeway the CEL came on and then it went into limp mode. I scanned for DTCs and got P2302 and P0300. I had the car towed home.

What I have done is replace the ignition coil and check the HT wires and plugs. The car still does not run correctly. Confirmed NO SPARK on #1 and #4 w/P2302 error presently showing when scanned.

I replaced the ASD relay and checked for continuity of the three wires to the coil's primary. I find no shorts, resistance or open circuits in the primary wires from the PCM to the coil with the plugs removed from the coil and PCM.

Here is the weird thing. With the harness plugged into the PCM I measure 21 ohms from the Bk/Y to ground and 0 ohms from Bk/Or to ground.

So the question is, is there a way to confirm a bad PCM other than what I have done? Is it safe to assume that my PCM is bad

Thanks for your help.

BTW, I read all the old threads on this subject and did not see an answer.

Last edited by Trackrash; 02 Dec 2017 at 07:48 pm.
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Old 02 Dec 2017, 10:25 pm
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Default Re: P2302 How to confirm bad PCM?

is it a GT ?
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Old 02 Dec 2017, 10:39 pm
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Default Re: P2302 How to confirm bad PCM?

Usually with P2302 code the problem is the spark plug wire, spark plug, or coil shorting to ground. I would visually first check the spark plugs for cracks as one other member had that problem arcing to ground. Also check for bad connection (check the depth of the pins) on the wire harness going to the coil plug. If all checks out good I would suggest you do a engine compression check on cylinder 1 & 4.

P2302 Chrysler Ignition Coil Secondary Number 1 Circuit Condition

Possible causes

1. Faulty spark plug or coil boot
2. Faulty Ignition Coil 1
3. Ignition Coil 1 harness is open or shorted
4. Ignition Coil 1 circuit poor electrical connection
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Last edited by ptcruisersteve; 02 Dec 2017 at 11:49 pm.
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Old 03 Dec 2017, 01:42 am
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Default Re: P2302 How to confirm bad PCM?

Not a GT, 2,4 NA.

Forgot to mention it is NOT intermittent.

Tried different plugs and wires in #1 and #4 installed a NEW COIL with not change.

Tested for spark in #1 and #4, NO SPARK, with the new coil.

I can not find a problem with the wiring, using an Ohm meter.

There must be a way to confirm a bad PCM?

What voltage should I read #2 coil primary (gr/or) with ignition on?

Thanks,

Last edited by Trackrash; 03 Dec 2017 at 01:53 am.
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Old 03 Dec 2017, 05:01 pm
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Default Re: P2302 How to confirm bad PCM?

Quote:
Originally Posted by Trackrash View Post
Not a GT, 2,4 NA.

Forgot to mention it is NOT intermittent.

Tried different plugs and wires in #1 and #4 installed a NEW COIL with not change.

Tested for spark in #1 and #4, NO SPARK, with the new coil.

I can not find a problem with the wiring, using an Ohm meter.

There must be a way to confirm a bad PCM?

What voltage should I read #2 coil primary (gr/or) with ignition on?

Thanks,
The only reason why I suggested you check the engine compression was to verify your ignition timing is good.

I would suggest resetting the codes with an OBDII Scan Tool and make sure you have no codes regarding your ignition timing such as for Camshaft or Crankshaft sensor codes.

Verify that there is no continuity between ground and the coil driver circuit.

What brand coil did you get to replace the original one. Members have purchased faulty coils.

A shorted coil can damage the coil driver in the PCM but this is very rare. Suggest making sure you don't have any shorts to ground in the coil driver circuit.
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Old 03 Dec 2017, 06:39 pm
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Default Re: P2302 How to confirm bad PCM?

Thanks for the help.

I reset the codes and started it up. Still running on two cylinders and immediately the CEL came on. Only DTC now is P2303.

I unplugged C2 from the PCM and tested both wires to the coil. No short to ground from either the #9 or #10 pins. Two ohms when measuring between #9 and #10 with the coil primary plug connected and the ignition turned off. Also no short detected between the coil's #2 contact and ground. Good continuity from the ASD output to the #2 contact on the coil connector.

My new coil is a NAPA Echlin.

I'm guessing the coil driver circuit is bad in the PCM, but want to confirm before buying a new module.
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Old 03 Dec 2017, 07:11 pm
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Default Re: P2302 How to confirm bad PCM?

Quote:
Originally Posted by Trackrash View Post
Thanks for the help.

I reset the codes and started it up. Still running on two cylinders and immediately the CEL came on. Only DTC now is P2303.

I unplugged C2 from the PCM and tested both wires to the coil. No short to ground from either the #9 or #10 pins. Two ohms when measuring between #9 and #10 with the coil primary plug connected and the ignition turned off. Also no short detected between the coil's #2 contact and ground. Good continuity from the ASD output to the #2 contact on the coil connector.

My new coil is a NAPA Echlin.

I'm guessing the coil driver circuit is bad in the PCM, but want to confirm before buying a new module.
Most likely the P2302 is causing the power engine compression balance issue triggering P2303.
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Last edited by ptcruisersteve; 03 Dec 2017 at 07:22 pm.
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Old 04 Dec 2017, 08:13 am
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Default Re: P2302 How to confirm bad PCM?

Do you have a u-pull yard or similar where you live? You could buy a used coil from any PT or Neon and try it out. It would be a cheap confirmation as to whether any of your coils are good or not. If its good you can stick it in the storage drawer under the passenger seat for a future situation if it ever arises. From my experience these cars do not like aftermarket coils.
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Old 04 Dec 2017, 03:50 pm
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Default Re: P2302 How to confirm bad PCM?

Thanks for the help. Before I buy a new PCM let me know if I missed anything.

Miss-fire condition and P2303 DTC suddenly occurred when driving. Not intermittent.

Replaced coil. Miss-fire condition continued with P2302 DTC.

Confirmed NO SPARK on #1 AND #4, with new coil.

Replaced ASD relay, no change.

No short or open circuit in coil primary coil circuit. Confirmed continuity and correct ohm reading when measuring from C2 #9 and #10 to the coil primary.

Reset DTC. No change, immediately got P2302 upon restart.

Confirmed no spark #1 and #4

Started motor and probed coil primary circuits with probe light. Strong steady signal from #2 (DG/OR). Strong flashing signal from #1 (DB/TN) wire. Very weak faint and steady signal from #3 (BK/GY) wire.

Since I am not getting a signal from wire #3 (BK/GY) can I assume the coil trigger in the PCM is bad?

Thanks again.

Last edited by Trackrash; 04 Dec 2017 at 03:55 pm.
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Old 04 Dec 2017, 04:56 pm
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Default Re: P2302 How to confirm bad PCM?

Quote:
Originally Posted by Trackrash View Post
Thanks for the help. Before I buy a new PCM let me know if I missed anything.

Miss-fire condition and P2303 DTC suddenly occurred when driving. Not intermittent.

Replaced coil. Miss-fire condition continued with P2302 DTC.

Confirmed NO SPARK on #1 AND #4, with new coil.

Replaced ASD relay, no change.

No short or open circuit in coil primary coil circuit. Confirmed continuity and correct ohm reading when measuring from C2 #9 and #10 to the coil primary.

Reset DTC. No change, immediately got P2302 upon restart.

Confirmed no spark #1 and #4

Started motor and probed coil primary circuits with probe light. Strong steady signal from #2 (DG/OR). Strong flashing signal from #1 (DB/TN) wire. Very weak faint and steady signal from #3 (BK/GY) wire.

Since I am not getting a signal from wire #3 (BK/GY) can I assume the coil trigger in the PCM is bad?

Thanks again.
What are you getting for resistance between PCM connector C2 pin 10 and ignition coil wire 3? It should be less than 0.5 ohms.
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