Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

- Fuel temperature sensor harness is open or shorted - Fuel temperature sensor circuit poor electrical connection - Faulty fuel tank temperature sensor

Tech Notes

Replaced Fuel Temperature Sensor

Description

The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.