For California

DTC P0181 FTT SENSOR





Component Description





The fuel tank temperature sensor (4) 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.
- Fuel level sensor unit and fuel pump (1)
- Fuel pressure regulator (2)
- Fuel level sensor (3)





[Reference data]






CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result damage the ECM's transistor. Use ground other than ECM, such as ground.




On Board Diagnosis Logic









DTC Confirmation Procedure

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-III
1. Turn ignition switch ON wait at least 10 seconds.
2. Check 1st trip DTC.
If 1st trip DTC is detected, go to For California.
If 1st trip DTC is not detected, go to following step.
3. Select "DATA MONITOR" mode with CONSULT-III.
4. Check "COOLAN TEMP/S" value.
If the "COOLAN TEMP/S" is less than 60�C (140�F), the result will be OK.
If the "COOLAN TEMP/S" is above 60�C (140�F), go to the following step.
5. Cool engine down until "COOLAN TEMP/S" signal is less than 60�C (140�F).
6. Wait at least 10 seconds.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to For California.

WITH GST
Follow the procedure "WITH CONSULT-III" above.




Wiring Diagram

EC-FTTS-01:

Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.





2. Loosen and retighten ground screws on the body. For California.
Arrow Indicates Vehicle front
- Body ground (1)
OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.





2. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
Arrow Indicates Vehicle front
3. Turn ignition switch ON.





4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-III or tester.

Voltage: Approximately 5 V

OK or NG
OK - GO TO 4.
NG - GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B9, E13
- Harness connectors E3, F2
- Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
- Repair open circuit or short to ground or short to power in harness or connector.
4.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect combination meter harness connector.
3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and combination meter terminal 4, ECM terminal 60. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 6.
NG - GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B8, M8
- Harness connectors B9, E13
- Harness connectors E3, F2
- Harness for open or short between "fuel level sensor unit and fuel pump" and combination meter.
- Harness for open or short between "fuel level sensor unit and fuel pump" and ECM.
- Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to, For California.
OK or NG
OK - GO TO 7.
NG - Replace "fuel level sensor unit and fuel pump".
7.CHECK INTERMITTENT INCIDENT
Perform For California For California.
- INSPECTION END




Component Inspection

FUEL TANK TEMPERATURE SENSOR





1. Check resistance between "fuel level sensor unit and fuel pump" terminal 4 and 5 by heating with hot water as shown in the figure.





2. If NG, replace "fuel level sensor unit and fuel pump".




Removal and Installation

FUEL TANK TEMPERATURE SENSOR
Component Removal and Installation.