Question about 2005 Pontiac Grand Prix
The CRANK RELAY primary wire (control circuit) is a YELLOW / BLACK wire and it goes to pin #23 in connector C1 at the PCM. If I were a betting man, I would say that the most likely cause of this problem is that the YELLOW/BLACK wire is shorting to ground. This will cause the start relay in the UNDERHOOD FUSE AND RELAY BOX to energize and make the starter engage. This wire runs from the PCM (Located inside the air cleaner assembly) to the START RELAY. (Located on the right stut tower in the UNDERHOOD FUSE AND RELAY BOX. Inspect the wiring harness all the way along this path. You will most likely find a place where the harness is rubbed through and there you will find the YELLOW/BLACK wire is most likely shorting to ground.
Posted on Apr 02, 2011
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Posted on Jan 02, 2017
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