Pinpoint Test E: Incorrect Temperature Gauge Indication
Instrumentation, Message Center and Warning Chimes
Pinpoint Test E: Incorrect Temperature Gauge Indication
Normal Operation
The PCM uses the Cylinder Head Temperature (CHT) sensor to monitor the engine temperature. The Instrument Cluster (IC) receives the engine temperature data from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The IC monitors the engine temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.
Failsafe Cooling
The PCM provides 2 modes or levels of failsafe cooling. These modes or levels provide a visual indication to the driver that the engine is overheating while reducing the engine power to lower the engine temperature. When the PCM sends the IC a failsafe mode 1 or 2 command, the IC drives the temperature gauge to the full hot (H) position.
If the engine temperature data is missing or invalid for 5 seconds or less or if IC receives invalid engine temperature data for 5 seconds or less, the IC defaults the temperature gauge to the last setting, based upon the last known good temperature status message received.
NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative tachometer, temperature gauge or odometer.
If the IC does not receive the engine temperature status message from the PCM for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the temperature gauge to cold (C).
If the engine temperature data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U2199 and defaults the temperature gauge to cold (C).
This pinpoint test is intended to diagnose the following:
- CHT sensor
- IC
PINPOINT TEST E: INCORRECT TEMPERATURE GAUGE INDICATION
