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How do you check if a pcm is working?

Tiny
ANONYMOUS
  • MEMBER
  • 1998 CHRYSLER CIRRUS
  • 114,000 MILES
How do you check if a pcm is working?
Monday, November 26th, 2012 AT 2:28 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
What's the problem, any applicable trouble codes? Can you communicate with computer? You can check for reference voltage at any sensor that uses a ref voltage, to see if computer will do anything. You can check voltage and grounds for the computer.
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Monday, November 26th, 2012 AT 2:49 PM
Tiny
JORDANCLYMER
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  • 4 POSTS
I dont know what the problem is my car stoped charging I was told it was the regulator in the pcm so I changed the pcm before it would run untill the battery died now with a diffrent pcm it would run for about 3 seconds then die like it lost fire it done that a few times but now wont runn at all
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Monday, November 26th, 2012 AT 4:20 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Is the pcm compatible with vehicle? If this is a new pcm, I believe the dealership will have to program computer.

If it cranks good but won't start, have a helper crank it, while you visually check for spark at the plugs. Anything?

What about security system?
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Monday, November 26th, 2012 AT 4:29 PM

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