Code 0402

The tank fuel temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the 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.




DIAGNOSTIC CHART




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
CONSULT
1) Turn ignition switch "ON".
2) Select "DATA MONITOR" mode with CONSULT.
3) Wait for at least 12 seconds.

OR

GST
1) Turn ignition switch "ON" and wait for at least 12 seconds.
2) Select "MODE 3" with GST.

OR

NO TOOLS
1) Turn ignition switch "ON" and wait for at least 12 seconds.
2) Turn ignition switch "OFF", wait for at least 5 seconds and then turn "ON".
3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

COMPONENT INSPECTION
Tank fuel temperature sensor







Check resistance as shown in the figure.
If NG, replace tank fuel temperature sensor.




WIRING DIAGRAM