2007 Buick LaCrosse Crank No Start
#63
Senior Member
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#64
Senior Member
GM has the pcm send power to the fuel pump relay. There’* been some replies about this issue On this thread. There’* a wiring diagram that I posted that proves this and I’ve also checked this out on my other Buick 3800 and the PCM does send power to only the fuel pump relay.
#65
Senior Member
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If the PCM is commanded to energize the relay you need to check at that pin. Make sure the pin is in good condition and that it has good contact and pin tension. If you have B+ at the pin and good contact and not getting to the relay you have an open between the PCM and the relay. If all is good at the relay but missing the B+ you could just run a redundant line and test. You may decide to just leave it in place.
#66
Senior Member
#67
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Thread Starter
I’ve checked continuity through that entire circuit especially from the relay all the way to the PCM and there are no breaks and no resistance in that wire. It’* perfectly intact. I’ve triple checked the pcm harness connecters also.
#68
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Thread Starter
The rpm varies too much. It goes from 200 rpm to 1200 rpm within a second. The typical data value is supposed to be Yes for a present signal the whole time the car is running but it spams yes and no. Do you think I should try another cam sensor?
#69
Senior Member