ECD SYSTEM(w/o DPF), Diagnostic DTC:P0182, P0183

DTC Code DTC Name
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. 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 the 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 fuel supply pump assembly and determines if there are errors.

A01VFXXE02

Tech Tips

When the fuel temperature sensor output is outside the normal range, the ECM determines that this is a malfunction.

P0182, P0183
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for approximately 15 seconds

Open or short in fuel temperature sensor circuit for 2 seconds

(2 trip detection logic)

  • Open or short in fuel temperature sensor (supply pump assembly) circuit

  • Fuel temperature sensor (supply pump assembly)

  • ECM
Related Data List
DTC No. Data List
P0182 Fuel Temperature
P0183

Tech Tips

When DTC P0182 or P0183 is stored, 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
149°C (300°F) Short circuit

WIRING DIAGRAM

A01VJ23E10
*a Fuel Temperature Sensor (Supply Pump Assembly)

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • Read freeze frame data using the intelligent tester. 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 INTELLIGENT TESTER (FUEL TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Read the value.

      OK
      Same as actual fuel temperature.
      Result
      Result Proceed to
      -40°C (-40°F) A
      149°C (300°F) or higher B
      Same as actual fuel temperature C

      Tech Tips


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

      • If there is a short circuit, the intelligent tester indicates 149°C (300°F) or higher.


    B

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    1. A01VKPUE02
      Text in Illustration
      *1 Fuel Temperature Sensor
      *2 ECM
      *a

      Front view of wire harness connector

      (to Fuel Temperature Sensor)

      Disconnect the fuel temperature sensor connector.

    2. Connect terminals B44-1 and B44-2 of the fuel temperature sensor wire harness side connector.

    3. Connect the intelligent tester to the DLC3.

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

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

    6. Read the value.

      Standard value
      149°C (300°F) or higher

    OK

    CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE SUPPLY PUMP ASSEMBLY (FUEL TEMPERATURE SENSOR) Click here

    NG

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


    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
      B44-1 - B21-29 (THF) Always Below 1 Ω
      B44-2 - B21-28 (ETHF) Always Below 1 Ω

    OK

    CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

  4. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    1. A01VKTQE37
      Text in Illustration
      *1 Fuel Temperature Sensor (Supply Pump Assembly)
      *2 ECM

      Disconnect the fuel temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

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

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

    5. Read the value.

      Standard value
      -40°C (-40°F)

    OK

    REPLACE SUPPLY PUMP ASSEMBLY (FUEL TEMPERATURE SENSOR) Click here

    NG

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


    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
      B44-1 or B21-29 (THF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE SUPPLY PUMP ASSEMBLY (FUEL TEMPERATURE SENSOR)


    1. Replace the supply pump assembly Click here.


    NEXT

    BLEED AIR FROM FUEL SYSTEM Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  9. CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPLACE SUPPLY PUMP ASSEMBLY (FUEL TEMPERATURE SENSOR)


    1. Replace the supply pump assembly Click here.


    NEXT

  11. BLEED AIR FROM FUEL SYSTEM


    1. Bleed air from fuel system Click here.


    NEXT

  12. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON and wait for 15 seconds or more.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    7. Confirm that the pending DTC is not output again.


    NEXT

    END