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1997 gcv no ck engine light key on all other message ctn lights work. Is the pcm the controller of self diagnostic sequence? If so any sugesstion as to how to correct the problem.
Thanks for the reply, I don't think it's a bulb the cel comes on when a code sets. It is my opinion that the PCM is not doing a self diagnostic test.
Slap22, 09/12/2010
My thinking is there is power to the circuit, the PCM either complete the circuit by grounding or furnish instruction to complete the circuit. Which initiate the bulb check and various monitored emission system.
Any advise is appreciated.
Tizzy1
CEL when I ground terminal 22 the cel light come on with key in start position. My question is, does the PCM ground CEL? Or is the grounding part of the self diagnostic.