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Electrical problems, PCM not connecting to scan?

Tiny
ROBOCOP50
  • MEMBER
  • 1995 PONTIAC TRANS AM
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,113 MILES
I bought this car 1.5 years ago and it had a few problems but hopefully I have them all fixed but my PCM will not connect to my laptop nor a scan too. It has an OBD II service port with an OBD I PCM. I am aware that a blown fuse or relay and cause this issue. Any help is greatly appreciated.
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Monday, October 31st, 2022 AT 6:12 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Hi,

If you aren't getting power to pin 16 on the DLC, there is a fuse to check. It is the cigarette and horn fuse. So, if the horn works, this is likely not the problem.

I attached the schematic below, so you have a reference. Let me know if it helps.

Take care,

Joe

See pic below.
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Monday, October 31st, 2022 AT 7:34 PM

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