PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

How does the PCM control C/C?

Old Feb 17, 2005 | 07:36 AM
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Default How does the PCM control C/C?

Swapped A4 to M6, Swapped PCM's and Engine Wiring Harnesses. Cruise Control Refuses to work. I was told that I should run a 12V switched circuit to the 32 pin on my blue PCM connector for the clutch switch. I did this and checked to make sure it was getting current when the clutch was out, and it is. I still have no c/c. I see that there are C/C enable and disable pinouts on the PCM. Could these be where I need to look? Any help is appreciated. I'm at a loss here.

edit: just a side note....If I put my A4 PCM back in, I get my cruise Control back, I just lose my Reverse lockout, and the speedometer is skewed. This tells me that it's not a fuse (although I checked anyway) and that power should be getting to the right place. The Clutch switch should be the only new thing that was introduced into the equation.
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Old Feb 17, 2005 | 12:19 PM
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I think you can get your A4 PCM flashed to an M6 PCM so that being the case head to the dealership.
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Old Feb 17, 2005 | 01:16 PM
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I have an M6 computer and it's not working. I guess it could possibly be the PCM, but I figured if I got my A4 flashed to an M6 it would have the same problem.
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Old Feb 17, 2005 | 02:13 PM
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pin 32 is supposed to be grounded, not recieve power!!
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Old Feb 17, 2005 | 03:07 PM
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Yikes, Hope I haven't screwed anything up. I guess I'll try that next.
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Old Feb 17, 2005 | 05:07 PM
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Thank you Wait4me, it worked like a charm. Been beating my head against a wall for a while trying to figure this out. This could be a problem for everybody doing an A4 to M6 conversion with the engine harness and PCM swap. I just cut the wire that I had run for a power wire to the #32 pin and grounded it near the battery. Fixed it immediately and nothing seem to be screwed up. Thanks again.

Will
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Old Feb 17, 2005 | 05:23 PM
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no problem, The signal is supposed to actually loose contact as you press in the petal, that way the computer knows what gear you are in. jes
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