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Home >> Infiniti >> 2003 >> FX45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0125: Insufficient Engine Coolant Temperature For Closed Loop Fuel Control >> Circuit Description

Circuit Description

The engine coolant temperature sensor is used to detect engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as engine coolant temperature input. The sensor uses a thermistor which is sensitive to changes in temperature. The electrical resistance of the thermistor decreases as temperature increases.

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