ECD SYSTEM, Diagnostic DTC:P0180/39, P0182/39, P0183/39

DTC Code DTC Name
P0180/39 Fuel Temperature Sensor "A" Circuit
P0182/39 Fuel Temperature Sensor "A" Circuit Low Input
P0183/39 Fuel Temperature Sensor "A" Circuit High Input

DESCRIPTION

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 (see below). 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, and the voltage at terminal THF also changes. Based on this signal, and the ECM corrects the pressure control compensation of the supply pump and errors.

A01BBBAE03
DTC No. DTC Detection Condition Trouble Area
P0180/39

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
P0182/39

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
P0183/39

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

A01BB39E01

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

PROCEDURE


  1. CHECK ECM TERMINAL VOLTAGE (THF TERMINAL)


    1. A01BF68E06

      Start the engine.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      D1-29 (THF) - D1-28 (E2) Idling, fuel temperature at 20°C (68°F) 0.5 to 3.4 V

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. INSPECT FUEL TEMPERATURE SENSOR


    1. A01BADWE06

      Remove the sensor.

    2. Measure the resistance of the sensor.

      Standard resistance
      Condition Specified Condition
      Approx. 20°C (68°F) 2.21 to 2.69 kΩ
      Approx. 80°C (176°F) 0.287 to 0.349 kΩ

      Note

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


    NG

    REPLACE FUEL TEMPERATURE SENSOR

    OK

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


    1. A01BDP1E07

      Disconnect the D1 ECM connector.

    2. Disconnect the D46 sensor connector.

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

      Standard resistance
      Tester Connection Specified Condition
      D1-29 (THF) - D46-2 Below 1 Ω
      D1-28 (E2) - D46-1 Below 1 Ω
      D1-29 (THF) or D46-2 - Body ground 10 kΩ or higher
      D1-28 (E2) or D46-1 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM