Car: Pontiac Bonneville 1988 3800 engine
For one, I don't have an OBD scanner, I'm using the paperclip approach to read the ECM trouble codes. Another factor is the fan does not turn on when I short A and B for diagnostic troubleshooting (I don't ever remember the fan coming on in diagnostics at any time for this car)
For now, I have to wait till Wednesday the 30th to do anything else on it since my wife uses it for work.
All it is giving me is a code 26, which is listed in my Haynes repair manual as 'Quad Driver module circuit'.(Codes 26 through 29 are all quad driver circuit, and that's all the book says on it too)
I've gone through the entire wiring and sensors, and the only thing I've found wrong is the oil pressure gauge is slammed to it's max position
I'm starting to think that the ECM is starting to go bad since the problem only occurs when the cars moving for a few minutes, and only occationally can I get the check engine light to come on while the cars parked.
I'm running out of time to fix the problem here ok, so I''m not beating around the bush here, so please, just tell me what you believe it may be, I'll check it out and confirm or deny it's the problem, and go from there. I'm just not interested in taking the car in to a shop and fork over a few hundred dollars for something I can fix for a lot less yet, so an answer that I really need is asked again:
What sensors does the quad driver module circuit #1 actually monitor, and what pin do I need to check on the ECM to test out the quad driver circuit to see if it's burned out or not?
Monday, May 28th, 2007 AT 12:33 PM