S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Temperature Gauge: Description and Operation
ENGINE COOLANT TEMPERATURE GAUGE
The IPC displays the engine coolant temperature as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine
coolant temperature. The engine coolant temperature gauge defaults to 100°F (40°C) or below if:
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The PCM detects a malfunction in the engine coolant temperature sensor circuit.
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The IPC detects a loss of class 2 communications with the PCM.
