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Possible Computer Issue

 
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Old 12 May 2014, 11:42 am
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Default Possible Computer Issue

I have 2004 PT Cruiser that had a P0340 code. I've replaced the CPS with a OEM part as well as the pig tail due to exposed wires. I confirmed the pig tail was wired in correct. The code did not clear. I went ahead and replaced the crank position sensor and knock sensor. The code still did not clear. The engine will not accelerate beyond 2500 rpms before jerking. I took to mechanic and he attempted to clear the code but a came right back. He said it could be a computer problem. I'm trying to make the repairs myself due to money. How can I confirm it's the computer before purchasing a new one?
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Old 12 May 2014, 11:59 am
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Default Re: Possible Computer Issue

It is hard to diagnosis a PCMs health based on a single DTC event.
If you are sure that the part and wiring are not at fault then all you can do is send it in to a ECU re-builder to either replace it or have it checked. At that point a $200 PCM with a lifetime warranty seems the logical choice.

I am not convinced that you corrected the part and the connector yet. Nor does it seem at lest by your posting that a OBDII diagnostic was performed and viewed completely? Mind this response I understand you may have shorten the information for your posting?
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Old 12 May 2014, 12:00 pm
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Default Re: Possible Computer Issue

Trace the wiring all the way back. They had issues with the wiring rubbing on the drive axle and causing issues like this.
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Old 12 May 2014, 07:51 pm
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Default Re: Possible Computer Issue

Thank you for the advise and insight. I've gone a far with it as I can. You are correct, I have not had a complete diagnostic done. I'm gonna take a mechanic before proceeding.
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Old 12 May 2014, 08:27 pm
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Default Re: Possible Computer Issue

Try replacing the magnet the camshaft sensor reads.
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Old 12 May 2014, 09:21 pm
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Default Re: Possible Computer Issue

I don't know if this is true for the PT, but some vehicles require a battery disconnect when sensors are replaced so that the PCM will re-learn the baseline characteristics of the sensores. Just a shot in the dark...
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Old 12 May 2014, 10:03 pm
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Default Re: Possible Computer Issue

Quote:
Originally Posted by alteet View Post
I don't know if this is true for the PT, but some vehicles require a battery disconnect when sensors are replaced so that the PCM will re-learn the baseline characteristics of the sensores. Just a shot in the dark...
Most PCM/ECM/ECU/TCM/TCU and specifically PT Cruiser PCMs DO NOT re-learn a base line as described. This is a misconception and perpetuated on many automotive forums.
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Old 13 May 2014, 05:38 am
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Default Re: Possible Computer Issue

Thanks for the clarification re: PT Cruiser.
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Old 13 May 2014, 09:14 am
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Default Re: Possible Computer Issue

you should add your location to your profile.

if you were near me and your car was stick shift, i'd bring my ECU over and let you try it.

you did properly solder and heat shrink the wires right? that's a pretty important sensor. i wouldn't twist stuff together or use a crimp on butt connector. just asking, we get all types here.
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Old 13 May 2014, 09:47 am
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Default Re: Possible Computer Issue

Damn canbus
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