P0181
P0181 FTT SENSOR
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. INSPECTION START
Is it necessary to erase permanent DTC?
YES- GO TO 7.
NO- GO TO 2.
2. 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 3.
3. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-I
1.Turn ignition switch ON and wait at least 10 seconds.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- GO TO 4.
4. CHECK ENGINE COOLANT TEMPERATURE
With CONSULT
1.Select "COOLAN TEMP/S" in "DATA MONITOR" with CONSULT.
2.Check "COOLAN TEMP/S" value.
With GST
Follow the procedure "With CONSULT" above.
"COOLAN TEMP/S" less than 60�C (140�F)?
YES- INSPECTION END
NO- GO TO 5.
5. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-II
With CONSULT
1.Cool engine down until "COOLAN TEMP/S" is less than 60�C (140�F).
Revision: March 20122013 Infiniti JX
2.Wait at least 10 seconds.
3.Check 1st trip DTC.
With GST
Follow the procedure "With CONSULT" above.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- GO TO 6.
6. PERFORM COMPONENT FUNCTION CHECK (FOR MALFUNCTION B)
Perform component function check. Refer to "Component Function Check" .
NOTE:
Use the component function check to check the overall function of the FTT sensor circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .
7. 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.
TESTING CONDITION:
-Before performing the following procedure, do not add fuel.
-Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
-Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
- GO TO 8.
8. PERFORM DTC CONFIRMATION PROCEDURE B
1.Start engine and let it idle for 60 minutes.
2.Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between 10�C (14�F) and 35�C (95�F).
3.Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4.Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
5.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END
Component Function Check
1. CHECK FUEL TANK TEMPERATURE (FTT) SENSOR
1.Turn ignition switch OFF.
2.Disconnect fuel level sensor unit and fuel pump harness connector.
3.Remove fuel level sensor unit. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX
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- GO TO 2.
NO- Proceed to "Diagnosis Procedure" .
2. CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .
Diagnosis Procedure
1. INSPECTION START
Confirm the detected malfunction (A or B). Refer to "DTC Logic" .
Which malfunction is detected?
A - GO TO 2.
B - GO TO 5.
2. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY
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 4.
NO- GO TO 3.
3. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between fuel tank temperature sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.
4. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
Revision: March 20122013 Infiniti JX
3.Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness connector.
4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair open circuit, short to ground or short to power in harness or connector.
5. CHECK FUEL TANK TEMPERATURE SENSOR
Check fuel tank temperature sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace fuel level sensor unit and fuel pump. Refer to "Exploded View" Exploded View.
Component Inspection
1. CHECK FUEL TANK TEMPERATURE SENSOR
1.Turn ignition switch OFF.
2.Remove fuel level sensor unit. Refer to "Exploded View" Exploded View.
3.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. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX