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 - Low ambient temperature operation

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.