Thread: rpm hand not moving

Originally Posted by Rico

Bill

If there's four wires that go into the CKP then I would suspect that there are two output waveforms?...One for the PCM and one for the cluster?

EDITED: Maybe one for PCM and one that goes to the ICM.

Part 1 -GM 3.8L Ignition Module Test and Crank Sensor Test (3X, 18X)

More information than you probably wanted to know.

Backup to here for more fun: http://easyautodiagnostics.com/index...articles_1.php