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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1112 (Instrument Cluster (Ic), Message Center, And Warning Chimes) >> Diagnostic Tests >> Instrument Cluster (IC) and Warning Chimes >> Pinpoint Tests >> Pinpoint Test T: The Engine Coolant Over Temperature Warning Indicator Is Never/Always On >> Normal Operation

Normal Operation

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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 instrument cluster (IC) monitors the engine coolant temperature data received from the PCM and when the engine coolant temperature is high, the engine over temperature warning indicator illuminates.

This pinpoint test is intended to diagnose the following:

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