Wiring/PCM question..
06-18-2008, 06:09 PM
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Wiring/PCM question.. I've got a problem with my 94'z...I have an SES light and both of my fans are on...idles fine(since I replaced the plugs).I tried to scan the car half a dozen times, and it kept saying "no response from pcm.).I sent it back to my tuner, he checked everything out and it was fine. He took my pcm and put it in another car, adjusted the tune for "his" injectors, and the his car fired right up. NO codes, NO fans, nothing!! Our final conclusion is, that it has to be in the wiring of the car. The only recent wiring that was done to the car is when we did an A4-M6 swap. There was some wiring done in the pcm, but Im not sure what.(since I didnt do it.)
Does anybody have any suggestions? Thought about checking out the trans. harness, even unplugging it to see if that helps any..Can anybody help me???
Does anybody have any suggestions? Thought about checking out the trans. harness, even unplugging it to see if that helps any..Can anybody help me???
06-19-2008, 02:31 AM
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Did the car run after the tranny swap?
When you hook up your scanner are you sure it's operating properly? Proper COM port chosen? If you've got the wrong COM port selected, you'll get the "no response from PCM" response.
When you hook up your scanner are you sure it's operating properly? Proper COM port chosen? If you've got the wrong COM port selected, you'll get the "no response from PCM" response.
06-23-2008, 06:38 PM
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Little update for this topic....After two different laptops, two different cables, and a Snap-on scanner, I still can't access the pcm. The only time we can access it, is when its in a completely different car.
Does that make sense?
Does that make sense?
06-23-2008, 11:17 PM
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I remember that certain codes make the fans turn on, i just cant remember what it is. Also my cable has switch on it to make the fuel pump turn on one way and the fans turn on the other way, when the switch is in the middle i can connect to my car. I would look at which codes cause the fan to come on and start there.
06-24-2008, 09:41 PM
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Would anybody know, the diagnostic pinout, then I could see whether Im getting power there, test the serial data pin, and my grounds..Im starting to hate this car...
