scanner powers up but cant communicate with pcm??
07-13-2012, 11:43 PM
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scanner powers up but cant communicate with pcm?? After having some exhaust work done my predator can't communicate with the pcm. The predator powers up but says I need to turn the key to the on position. It says that while the car is idling. I checked the cid fuse and that is fine. Any suggestions. The car is a 02 z28 . I thought maybe it was the predator but advance auto scanner done the samething.
07-14-2012, 12:21 PM
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Start probing the OBD2 port for voltage. If that checks out, you'll need to start tracing wires back to the PCM and check for a short somewhere in the circuit.
07-14-2012, 06:02 PM
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Sometimes the pin at the obd port gets a lil worn out or loose u can depin it and try squishing it a lil bit and see if that cures the problem sounds like it would be the data line wire ifrc its purple
