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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Information Center - Instrument Cluster (Ic), Message Center, & Warning Chimes) >> Diagnostic Tests >> Instrument Cluster (Ic), Message Center And Warning Chimes >> Pinpoint Tests >> Pinpoint Test D: The Tachometer Is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

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:

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