Test D: The Tachometer Is Inoperative

PINPOINT TEST D: THE TACHOMETER IS INOPERATIVE

D1-D4:

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

Possible Causes
- PCM
- instrument cluster