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2004 GMC ENVOY 4.2 ing. I had the pump working
fine for about three mounths now it has failed again
does not come on at all Fuses are good.
Ground brown wire at pin 44 of connector 1 at the PCM and let me know if air pump turns on, here is a picture of PCM. Let me know, thanks.
Whitch is conecter # XXXXX
nothing happend does the switch have to be on
Yes, key needs to be in on position when testing. Let me know, thanks.
86 has voltage but 85 has no ground
With brown wire grounded # XXXXX still has no ground