Symptoms

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

Possible Causes

- Harness or connectors (The sensor circuit is open or shorted) - Fuel tank temperature sensor may be faulty - Low ambient temperature operation

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.