ECD SYSTEM (w/o EGR Cooler), Diagnostic DTC:P0180, P0182, P0183

DTC Code DTC Name
P0180 Fuel Temperature Sensor "A" Circuit
P0182 Fuel Temperature Sensor "A" Circuit Low Input
P0183 Fuel Temperature Sensor "A" Circuit High Input

DESCRIPTION

A01DZUUE03

The fuel temperature sensor monitors the fuel temperature. The fuel temperature sensor has a thermistor that varies its resistance depending on the fuel temperature. When the fuel temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance decreases. The variations in resistance are communicated to the ECM as changes in voltage (see Fig. 1).

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 resistor R.

The resistor R and 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 voltage at terminal THF also changes. Based on this signal, the ECM corrects the pressure control compensation of the supply pump and errors.

DTC No. DTC Detection Condition Trouble Area
P0180

Open or short in fuel temperature sensor circuit for 0.5 seconds

(1 trip detection logic)


  • Open or short in fuel temperature sensor circuit

  • Fuel temperature sensor

  • ECM

P0182

Short in fuel temperature sensor circuit for 0.5 seconds

(1 trip detection logic)


  • Open or short in fuel temperature sensor circuit

  • Fuel temperature sensor

  • ECM

P0183

Open in fuel temperature sensor circuit for 0.5 seconds

(1 trip detection logic)


  • Open or short in fuel temperature sensor circuit

  • Fuel temperature sensor

  • ECM

WIRING DIAGRAM

A01DVMIE09

INSPECTION PROCEDURE

Tech Tips


  • If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

Note

If the ECM is replaced, the new ECM needs initialization Click here.

PROCEDURE


  1. CHECK ECM (THF VOLTAGE)

    A01DYCSE35

    1. Start the engine.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      E8-29 (THF) - E8-28 (E2) Idling, intake air temperature at 20°C (68°F) 0.5 to 3.4 V

    OK
    NG
  2. INSPECT FUEL TEMPERATURE SENSOR

    A01DXMME01

    1. Remove the sensor.

    2. Measure the resistance of the sensor.

      Standard resistance
      Condition Specified Condition
      Approximately 20°C (68°F) 2.32 to 2.59 kΩ
      Approximately 80°C (176°F) 0.310 to 0.326 kΩ

      Note

      When checking the fuel temperature sensor in water, keep the terminals dry. After the check, wipe the sensor dry.


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

    A01DXW1E02

    1. Disconnect the E8 ECM connector.

    2. Disconnect the F11 sensor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      E8-29 (THF) - F11-2 (THF) Below 1 Ω
      E8-28 (E2) - F11-1 (E2) Below 1 Ω
      E8-29 (THF) or F11-2 (THF) - Body ground 10 kΩ or higher
      E8-28 (E2) or F11-1 (E2) - Body ground 10 kΩ or higher

    NG
    OK