ECD SYSTEM, Diagnostic DTC:P0180

DTC Code DTC Name
P0180 Fuel Temperature Sensor "A" Circuit

DESCRIPTION

The fuel temperature sensor senses the fuel temperature. A thermistor built into the sensor changes the resistance value according to the fuel temperature. The lower the fuel temperature, the greater the thermistor resistance value, and the higher the fuel temperature, the lower the thermistor resistance value.

The fuel temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the fuel temperature sensor from terminal THF via a resistor R. That is, resistor R and the fuel temperature sensor are connected in series. When the resistance value of the fuel temperature sensor changes in accordance with changes in the fuel temperature, the potential at the terminal THF also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability during low engine revolution and high fuel temperature.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0180 Fuel Temperature Sensor "A" Circuit Open or short in fuel temperature sensor circuit for 0.5 seconds or more.
  • Open or short in fuel temperature sensor circuit

  • Fuel temperature sensor

  • ECM

Comes on DTC stored

WIRING DIAGRAM

A01SAIAE42
*a Fuel Temperature Sensor

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING GTS (FUEL TEMPERATURE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.


      Powertrain > Engine > Data List
      Tester Display
      Fuel Temperature
    4. Read the value.

      Result
      Display Proceed to
      -40°C (-40°F) A
      140°C (284°F) or more B
      The same as actual engine coolant temperature C

      Tech Tips


      • If there is an open circuit, the GTS indicates -40°C (-40°F).

      • If there is a short circuit, the GTS indicates 140°C (284°F) or more.


    B
    C
    A
  2. CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN)


    1. A01SBZOC27
      *1 Fuel Temperature Sensor
      *2 ECM
      *a

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

      Disconnect the fuel temperature sensor connector.

    2. Connect terminals 1 and 2 of the fuel temperaturesensor connector.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON and turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.


      Powertrain > Engine > Data List
      Tester Display
      Fuel Temperature
    6. Read the value.

      OK
      140°C (284°F) or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG
  3. CHECK HARNESS AND CONNECTOR (ECM - FUEL TEMPERATURE SENSOR)


    1. Disconnect the fuel temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      C78-2 - C128-23 (THF) Always Below 1 Ω
      C78-1 - C128-31 (ETHF) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)


    1. A01W9R7C38
      *1 Fuel Temperature Sensor
      *2 ECM

      Disconnect the fuel temperature sensor connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON and turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.


      Powertrain > Engine > Data List
      Tester Display
      Fuel Temperature
    5. Read the value.

      OK
      -40°C (-40°F)
      Result
      Proceed to
      OK
      NG

    OK
    NG
  5. CHECK HARNESS AND CONNECTOR (ECM - FUEL TEMPERATURE SENSOR)


    1. Disconnect the fuel temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      C78-2 or C128-23 (THF) - Body ground and other terminals Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG