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.

Reference Data:

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

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

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

Diagnostic Procedure Step 1 - 2:

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 T and E by heating with hot water or heat gun as shown in the figure.
If NG, replace fuel level sensor unit.