Pinpoint Test C: The Temperature Gauge Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Test C: The Temperature Gauge Is Inoperative (Non-Hybrid)

Normal Operation

The PCM uses the Engine Coolant Temperature (ECT) sensor to measure the engine temperature on the 3.0L engine and the Cylinder Head Temperature (CHT) sensor on the 2.5L engine. 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 (Instrument Cluster) monitors the engine temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.

If the IC (Instrument Cluster) receives invalid engine temperature data from the PCM for 5 seconds or less, the IC (Instrument Cluster) defaults the temperature gauge to the last setting, based upon the last known good temperature status message.

If the IC (Instrument Cluster) does not receive the engine coolant temperature status message from the PCM for more than 5 seconds, the IC (Instrument Cluster) sets DTC U0100 in continuous memory and defaults the temperature gauge to cold (C).

If the IC (Instrument Cluster) receives invalid data for more than 5 seconds, the IC (Instrument Cluster) sets DTC U2199 and defaults the temperature gauge to cold (C).

This pinpoint test is intended to diagnose the following:

- PCM

- IC (Instrument Cluster)

PINPOINT TEST C : THE TEMPERATURE GAUGE IS INOPERATIVE (NON-HYBRID)

C1 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.

Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to C2.

C2 CARRY OUT THE TEMPERATURE GAUGE ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) DataLogger.

- Select the IC (Instrument Cluster) temperature gauge (ENGCOOLNT) active command. Command the temperature gauge to 50°C (122°F), 100°C (212°F) and 125°C (257°F) while monitoring the gauge.

Does the temperature gauge start at cold (C), move to the mid-range and end at full hot (H)?

Yes
GO to C3.

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

C3 RETRIEVE THE RECORDED DTCs FROM THE IC (Instrument Cluster) SELF-TEST

- Check for recorded IC (Instrument Cluster) DTCs from the self-test.

Are any DTCs recorded?

Yes
For DTC U0100, GO to Pinpoint Test AV Pinpoint Test AV: DTC U0100.

For all other DTCs, REFER to DTC Charts Instrumentation, Message Center and Warning Chimes.

No
INSTALL a new PCM. TEST the system for normal operation.