Grand Prix V6-3.1L VIN J (2000)
Engine Controls Schematics: I/P, Generator and Driver Information Display
CIRCUIT DESCRIPTION
The PCM supplies the ground to energize the Instrument Cluster tachometer. When the ignition switch is first turned ON the PCM grounds the
tachometer circuit. The circuit will remain grounded until the PCM receives the first 24X reference pulse. Once the 24X reference pulse is received,
the PCM controls the pulse frequency in relationship to engine RPM. The tachometer is controlled at a rate of two pulses per crankshaft revolution.
DIAGNOSTIC AIDS
Refer to Instrument Cluster System Check in Instrument Panel, Gauges and Console for additional diagnostic information.
