P0181

P0181 FTT SENSOR





DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - GO TO 3.
3.CHECK ENGINE COOLANT TEMPERATURE
1. Select "COOLAN TEMP/S" in "DATA MONITOR" with CONSULT-III.
2. Check "COOLAN TEMP/S" value.
"COOLAN TEMP/S" less than 60�C (140�F)?
YES - INSPECTION END
NO - GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE-II
1. Cool engine down until "COOLAN TEMP/S" is less than 60�C (140�F).
2. Wait at least 10 seconds.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connection.
2.CHECK DTC WITH "COMBINATION METER"
Scan Tool Testing and Procedures.
Is the inspection result normal?
YES - GO TO 3.
NO - Go to Fuel Level Sensor Signal Circuit.
3.CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
3. Turn ignition switch ON.
4. Check the voltage between "fuel level sensor unit and fuel pump" harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M117, B201
- 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.
5.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect "combination meter" harness connector.
3. Check the continuity between "fuel level sensor unit and fuel pump" harness connector and "combination meter" harness connector.





4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 7.
NO - GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M117, B201
- Harness for open or short between "fuel level sensor unit and fuel pump" and "combination meter"
- Repair open circuit, short to ground or short to power in harness or connector.
7.CHECK FUEL TANK TEMPERATURE SENSOR
SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 8.
NO - Replace "fuel level sensor unit and fuel pump".
8.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END




Component Inspection
1.CHECK FUEL TANK TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
3. Remove fuel level sensor unit.





4. Check resistance between "fuel level sensor unit and fuel pump" terminals by heating with hot water as shown in the figure.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace "fuel level sensor unit and fuel pump".