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Home >> Ford >> 2008 >> Crown Victoria V8-4.6L >> Repair and Diagnosis >> Instrument Panel, Gauges and Warning Indicators >> Testing and Inspection >> Pinpoint Tests >> Instrument Cluster >> Test D: The Tachometer Is Inoperative

Test D: The Tachometer Is Inoperative

PINPOINT TEST D: THE TACHOMETER IS INOPERATIVE

Normal Operation
The PCM uses the crankshaft position sensor to measure the engine rpm and sends the data to the instrument cluster (IC), over the controller area network (CAN), to command the tachometer gauge. If the rpm information sent to the instrument cluster (IC) is invalid or missing, the instrument cluster (IC) defaults the tachometer to 0 rpm.

This pinpoint test is intended to diagnose the following:
- PCM
- Instrument cluster (IC)


D1-D4:




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