Test D: Incorrect Temperature Gauge Indication
PINPOINT TEST D: INCORRECT TEMPERATURE GAUGE INDICATIOND1-D4:
D4-D6:
Normal Operation
The powertrain control module (PCM) receives the engine coolant temperature status through hardwired circuitry to the cylinder head temperature (CHT) sensor. The PCM sends the engine coolant temperature data to the instrument cluster over the high speed controller area network (HS-CAN) communication bus. The engine temperature data received from the PCM is filtered by the cluster to reduce gauge fluctuations. There are two separate strategies that the PCM and instrument cluster use to control the temperature gauge. The first strategy is basic engine temperature, which provides gradual changes in the temperature gauge based upon changing engine temperature. The second strategy is the failsafe cooling mode, which commands the gauge to the hot (H) stop position. If the instrument cluster does not receive the engine temperature status or if the temperature data is deemed invalid by the instrument cluster for more than 5 seconds, the message is considered missing and the instrument cluster sets DTC U0100 and defaults the temperature gauge to the cold (C) stop.
DTC U2199 - is a continuous DTC that sets if the instrument cluster receives invalid engine temperature data from the PCM. The instrument cluster defaults the temperature gauge to the cold (C) stop.
Possible Causes
- PCM
- Instrument cluster