Pinpoint Test U: The Engine Over-Temperature Warning Indicator Is Never Or Always On

Normal Operation and Fault Conditions
See Engine Over-Temperature Warning Indicator. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

If the engine coolant temperature or engine over-temperature indicator messages are missing or invalid for less than 5 seconds, the IPC defaults the engine over-temperature warning indicator to the last indication state (on or off), based upon on the last message received.

If the engine coolant temperature or engine over-temperature indicator messages are missing or invalid for 5 seconds or longer, the IPC defaults the engine over-temperature warning indicator on.

Possible Sources
- Communication concern
- GWM concern
- PCM input concern
- IPC

U1 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL
- Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).
- Select the IPC engine over-temperature warning indicator PID (COOLANT_LMP).
- Command the engine over temperature warning indicator on then off while observing the engine over temperature warning indicator.
Does the engine over temperature warning indicator turn on when commanded on and turn off when commanded off?

Yes GO to U2

No INSTALL a new IPC.Instrument Panel Cluster (IPC)

U2 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to DTC Chart: IPC .

No GO to U3

U3 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the PCM KOEO self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to the appropriate Electronic Engine Controls article .

No GO to U4

U4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes	REFER to: Communications Network .

No	If the engine over-temperature indicator is never on, the system is operating correctly at this time. If the engine over-temperature indicator is always on, INSTALL a new IPC.Instrument Panel Cluster (IPC) .