ECD SYSTEM, 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

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 of the thermistor is high. When the temperature is high, the resistance is low. The variations of resistance are communicated to the ECM as changes of 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.

Resistor R and fuel temperature sensor are connected in series. When the resistance value of the fuel temperature sensor changes due to a change of 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 determines errors.

A01KI7CE03
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)

  • 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 in fuel temperature sensor circuit

  • Fuel temperature sensor

  • ECM

Tech Tips

When DTC P0180, P0182 and/or P0183 is detected, check the fuel temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Temperature.

Temperature Displayed Malfunction
-40°C (-40°F) Open circuit
140°C (284°F) or more Short circuit

WIRING DIAGRAM

A01KEO1E01

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. INSPECT ECM TERMINAL VOLTAGE (THF TERMINAL)


    1. A01KGW1E24
      Text in Illustration
      *1 ECM Connector

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      E6-29 (THF) - E6-28 (E2)

      Idling, intake air temperature at

      20°C (68°F)

      		 0.5 to 3.4 V

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. INSPECT FUEL TEMPERATURE SENSOR


    1. A01KH2FE01

      Remove the fuel temperature 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.

    3. Reinstall the fuel temperature sensor.


    NG

    REPLACE FUEL TEMPERATURE SENSOR

    OK

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


    1. A01KFLFE08
      Text in Illustration
      *1 ECM Connector
      *2 Fuel Temperature Sensor Connector
      *a Wire Harness Side
      *b Front View

      Disconnect the E6 ECM connector.

    2. Disconnect the F17 fuel temperature sensor connector.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      E6-29 (THF) - F17-2 (THF) Below 1 Ω
      E6-28 (E2) - F17-1 (E2) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      E6-29 (THF) or F17-2 (THF) - Body ground 10 kΩ or higher
      E6-28 (E2) - F17-1 (E2) - Body ground 10 kΩ or higher

    4. Reconnect the fuel temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM