P0181

DTC P0181 FTT SENSOR







Component Description
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.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the 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-II
1. Turn ignition switch ON.




2. Select "DATA MONITOR" mode with CONSULT-II.
3. Wait at least 10 seconds.
If the result is NG, go to "Diagnostic Procedure" below.
If the result is OK, go to following step.

4. Check "COOLAN TEMP/S" value.
If "COOLAN TEMP/S" is less than 60 °C (140 °F), the result will be OK.
If "COOLAN TEMP/S" is above 60 °C (140 °F), go to the following step.

5. Cool engine down until "COOLAN TEMP/S" is less than 60 °C (140 °F).
6. Wait at least 10 seconds.
7. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

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

EC-FTTS-01:

Wiring Diagram

Diagnostic Procedure (Steps 1 - 3):

Diagnostic Procedure (Steps 4 - 8):

Diagnostic Procedure

Component Inspection

FUEL TANK TEMPERATURE SENSOR
1. Remove fuel level sensor unit.




2. Check resistance between "fuel level sensor unit and fuel pump" terminals 4 and 5 by heating with hot water or heat gun as shown in the figure.