Idle problem, revs from 850 to 1500 rpm.
#11
12-17-2010, 03:58 AM
#12
12-18-2010, 04:09 PM
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Replaced PCM with one from a buddys junk yard and its still throwing the P1684 and P0601 codes. Does anybody have any ideals on this??? I've checked all wires at PCM connector for short to ground and in the process of checking opens and wires shorted together. Thanks for the help so far!!!
#13
12-19-2010, 05:08 AM
Found this with a quick search online:
P0601 means that a serial communication failed inside the computer at least 6 times. Diagnostic is long, complicated process. It involves first checking all power and grounds to the pcm, including fuses. Next is to do a continuity check of all input and output lines from the pcm to the respective components. Finally, a check for any shorted output devices. With this code, all monitoring by the pcm is suspended. Good luck!
#14
12-19-2010, 03:05 PM
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Well, did all that!!! All is working as it should. Now it's throwing codes P1684, P0601 and P1294. My book doesn't cover that code. I was wondering if the PRNDL switch could have anything to do with this problem since it's only doing it in P or N, not that I have found a problem just wondering? Read on the truck forum that I should remove IAC and clean with carb cleaner and also clean the ports in the throttle body, any advice on this? Thanks again for the help this one has me stumped, I'm not a big fan of parts changers but I'm just about there with this one!!!
#15
12-19-2010, 03:56 PM
