Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Yes bat voltage on y/b wire key in on and start position. #87 ppl to starter
#30red bat voltage from the fuseible link
Yes there is power on both sides of the PCM crank fuse which is 10 amps in the start position
Ok there is cont. from the pcm y/b wire to the relay socket y/b wire and the engine does crank from pink to purple wire. how do i determine if the neutral safety is bad or the pcm. pcm seems to be doing its job
Ok with the key in the off position I have cont. on the wht wire, but when I turn the key to the acc or on position the cont. breaks, could it be a bad neutral safety sw?Not sure if it is suppose to stay with the key on? Also no grn/wht wire. sounds like it could be a bad ground somewhere like you said.
Ok I guess i will check all the grounds from the pcm and see if I can find one open. Other than that one last thing according to a GM check sheet I probed between the bat. terminal side of the relay to the yel/blk(control side of the relay with a DMM and put the key in the start position and saw -12.84 v. Thank you for your help Mike I appreciate it very much.
yes and I tested the relay all good
Voltage at the yellow black wire with the key of is negative 96.7 milli volts voltage on the yellow black with the key on or start is 5.5 voltage same voltage in on or start position
Mike I have full battery voltage on the yellow black wire at the PCM with the relay in if I pull the relay and measure voltage at the yellow black on the PCM I have zero voltage both times with key in start position
Disregard that I have full battery at PCM yellow black and yellow black at the relay with the key in the on or start position voltage does not change 12.8v
Mike thank you very much for your patience and your expertise I appreciate it very much and will leave feedback for you have a great day!
need help on a 1999 Chevy K3500 pickup with a 7.4 L