In my enthusiasm to help someone out with their thread, I may have fried my EEC/PCM!?!
I have a 95, 3.8L, 80k. I think I had shorted battery voltage through my ECT harness to the EEC/PCM in a momentary lapse of reason.
I could smell something got hot inside and outside the car. I can't recall, as it was a week or more ago when this happened, but I think the car was running and stalled when I did my dumbness.
Anyway, I finally got the courage to investigate the damage with a test drive and my ECM/ABS code reader. When driven, the check engine light would come on and off, but not much. The car ran like crap. Running rough and acting like it wanted to stall and sometimes would stall when stopped. The engine would run better at higher rpm, but was still not right. At idle, when it tried to keep from stalling, it would run rich, as I could see black smoke and smell gas from the exhaust. When starting at a stop and pushing hard on the gas, lots of black smoke could be seen.
I got the above codes. According to my Innova code reader manual, 543 is" fuel pump secondary circuit failure," Haynes says 543 is "fuel pump circuit open: battery to ECA." What do these mean and what can I do to make a repair? Haynes is of no help and doesn't mention a secondary fuel pump circuit. Innova says 634 is "manual lever position voltage higher or lower than expected." Is this the column gear shifter? What can I do to fix this? Is this the TRS voltage? Is there a way I can test my EEC/PCM? To confirm, it is located on the firewall right below the EEC and ABS test ports or is it inside behind the glovebox? What does it look like, as I think what I have seen by the datalink is the ICM, not the PCM so far?
Everyone's help will be greatly appreciated so that I can avoid too much tail chasing, blind part replacing and pointless investigating. Thanks!!!
