Pinpoint Test C: Incorrect Temperature Gauge Indication

Instrumentation, Message Center and Warning Chimes

Pinpoint Test C: Incorrect Temperature Gauge Indication

Normal Operation

The PCM receives the engine coolant temperature status through hardwired circuitry from the Cylinder Head Temperature (CHT) sensor. The Instrument Cluster (IC) receives the engine coolant temperature data from the PCM over the High Speed Controller Area Network (HS-CAN). The IC monitors the engine coolant temperature data received from the PCM and commands the engine coolant temperature gauge pointer.

This pinpoint test is intended to diagnose the following:

- PCM
- IC



PINPOINT TEST C: INCORRECT TEMPERATURE GAUGE INDICATION

-------------------------------------------------
C1 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


- Check for recorded PCM DTCs from the KOEO self-test.
- Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to C2.

-------------------------------------------------
C2 CARRY OUT THE IC COOLANT TEMPERATURE GAUGE ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC coolant temperature gauge (ENGCOOLNT) active command and command the coolant temperature gauge to 25%, 75%, 100% and 125%.
- Does the temperature gauge start at C (cold), move to approximately 1/4, 1/2, then H (hot)?

Yes
INSTALL a new PCM. TEST the system for normal operation.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

-------------------------------------------------