Test C: The Temperature Gauge Is Inoperative

PINPOINT TEST C: THE TEMPERATURE GAUGE IS INOPERATIVE

Normal Operation
The PCM receives the engine coolant temperature status through hardwired circuitry to the engine coolant temperature (ECT) sensor (4.0L engine), or from the cylinder head temperature (CHT) sensor (4.6L engine). The instrument cluster (IC) receives the engine coolant temperature data from the PCM over the high speed controller area network (HS-CAN). The instrument cluster (IC) monitors the engine coolant temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.

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

C1-C4: