V6 PCM Problem?
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Joined: Oct 1999
Posts: 320
From: Crowded SW Florida
V6 PCM Problem?
My 1997 OBD2 V6 Firebird has some problems-
The speedo stopped working, then the fans stopped working, then the SES light came on for a while and now it is out. When I plug in a scanner to the OBD2 service port, I get no reading or power. I checked all fuses & they are OK.
The car starts & runs fine, but is overheating at idle due to the fans.
Could the PCM be going bad?
The speedo stopped working, then the fans stopped working, then the SES light came on for a while and now it is out. When I plug in a scanner to the OBD2 service port, I get no reading or power. I checked all fuses & they are OK.
The car starts & runs fine, but is overheating at idle due to the fans.
Could the PCM be going bad?
Thread Starter
Registered User
Joined: Oct 1999
Posts: 320
From: Crowded SW Florida
1 down & 1 to go!
As it turns out, the cigar/acc fuse on the 1997 model apparently also powers the OBD2 diagnostics. This fuse was blown, I replaced it & now the fans & scanner work but no speedo/odometer.
Time to test the vehicle speed sensor from the look of things.
Time to test the vehicle speed sensor from the look of things.
Thread Starter
Registered User
Joined: Oct 1999
Posts: 320
From: Crowded SW Florida
Problem #2 solved. It turns out some <Red Forman> dumb***</Red Forman> had cut off the plug to the speed sensor and soldered the wires to the pins 
. Fortunately, I had an old LT1 harness & cut off the speed sensor plug and wired it up like it should be.
. Fortunately, I had an old LT1 harness & cut off the speed sensor plug and wired it up like it should be.
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