Symptoms

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

Possible Causes

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

When Detected

- An excessively high or low voltage is sent to ECM. - Rationally incorrect voltage is sent to ECM, compared with

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.