The fuel tank 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.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
Turn ignition switch ON and wait at least 10 seconds.
Check 1st trip DTC. Is 1st trip DTC detected?
YES >> Go to Diagnosis Procedure.
NO >> GO TO 3. 3.CHECK ENGINE COOLANT TEMPERATURE With CONSULT-III
Select "COOLAN TEMP/S" in "DATA MONITOR" with CONSULT-III.
Check "COOLAN TEMP/S" value. With GST
Follow the procedure "With CONSULT-III" above.
Is "COOLAN TEMP/S" less than 60°C (140°F) ?
YES >> Inspection END
NO >> GO TO 4. 4.PERFORM DTC CONFIRMATION PROCEDURE-II With CONSULT-III
Cool engine down until "COOLAN TEMP/S" is less than 60°C (140°F) .
Wait at least 10 seconds.
Check 1st trip DTC. With GST
Follow the procedure "With CONSULT-III" above.
Is 1st trip DTC detected?
YES >> Go to Diagnosis Procedure.
NO >> Inspection END
YES >> GO TO 2.
NO >> Repair or replace ground connection. 2.CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
Turn ignition switch OFF.
Disconnect "fuel level sensor unit and fuel pump" harness connector.
Turn ignition switch ON.
Check the voltage between "fuel level sensor unit and fuel pump" harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3. 3.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors B10, E29
Harness for open or short between ECM and "fuel level sensor unit and fuel pump" >> Repair open circuit, short to ground or short to power in harness or connector.
4.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5. 5.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors B1, M6
Harness connectors E30, M1
Harness for open or short between "fuel level sensor unit and fuel pump" and ECM >> Repair open circuit, short to ground or short to power in harness or connector.
