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Automotive/grand am on board diagnostic

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Expert: Sean Halliday - 3/1/2007


Question
My 98 Grand am failed inspection because the plug in connector under the inst cluster wasn't giving a signal. The fuse was okay; don't know where to start in trouble shooting this problem. Any obvious places?

Answer
You will need the wiring diagram for this car.Trace the plug back to the PCM.It may be a faulty PCM(power control module )or simply a bad wire.Find out if you have a PROM,some of these cars had them ...its between the PCM and the wire loom.It plugs into the PCM.take it off and clean it as described in your manual.Chiltons is a good investment.

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Sean Halliday

Expertise

general auto repair,japanese,bmw,mercedes,mini cooper 1960/2009,general british cars,ford.I DO NOT work on automatic transmissions.Manual transissions i install clutches only.Many people ask me to diagnose noises from their cars,unfortunately i cannot do this unless i hear it.As you appreciate,vehicles can and will make a variety of noises.I DONT UPGRADE or fit aftermarket performace kits,parts,chips,only replacement parts.

Experience

40 years experience on all general auto repair.

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