P0181

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)

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 "Diagnostic Procedure" below.
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 "Diagnostic Procedure" below.

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

EC-FTTS-01:

Wiring Diagram

Step 1-3:

Step 4-7:

Diagnostic Procedure

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".