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Pinpoint Test I : The Temperature Gauge Is Inoperative: Notes

Normal Operation and Fault Conditions 

See Temperature Gauge. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

If the IPC does not receive the engine coolant temperature data or engine overheat indication request messages or if the engine coolant temperature message is deemed invalid from the PCM for 5 seconds or longer, the IPC defaults the temperature gauge to cold (C).

Possible Sources 

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