Pinpoint Test 4: Incorrect Temperature Gauge Indication

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PINPOINT TEST 4: INCORRECT TEMPERATURE GAUGE INDICATION - HYBRID

Normal Operation

The PCM uses the cylinder head temperature (CHT) sensor to measure the engine coolant temperature. The instrument cluster receives the engine coolant temperature data from the PCM over the high speed controller area network (HS-CAN) communication bus. The instrument cluster monitors the engine coolant temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.If the instrument cluster receives invalid engine coolant temperature data from the PCM for 5 seconds or less, the instrument cluster defaults the temperature gauge to the last setting, based upon the last known good temperature status message. If the instrument cluster does not receive the engine coolant temperature status message from the PCM or if the data received is deemed invalid for more than 5 seconds, the instrument cluster sets DTC U0100 in continuous memory and defaults the temperature gauge to cold (C).

NOTE: If DTC U0100 is set in the instrument cluster, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

Possible Causes
- CHT sensor
- PCM concern
- Instrument cluster

Diagnostic Procedure

Step 1-Step 3:

Step 4-Step 5:

Step 6: