SFI SYSTEM, Diagnostic DTC:P059714

DTC Code DTC Name
P059714 Thermostat Heater Control Circuit Short to Ground or Open

DESCRIPTION

Refer to DTC P059712.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P059714 Thermostat Heater Control Circuit Short to Ground or Open

Open or short in thermostat heater circuit and power supply circuit

(1 trip detection logic).

  • Open or short in thermostat heater circuit

  • Thermostat heater (water inlet with thermostat sub-assembly)

  • ECM

 Comes on DTC stored SAE Code: P0598

MONITOR DESCRIPTION

The ECM monitors the output voltage while the thermostat heater is operating.

The thermostat heater turns on and off according to ON/OFF switching of a transistor inside the ECM.

If a continuous mismatch occurs between the ECM transistor state and the output voltage, the ECM determines there is a malfunction in the thermostat heater circuit and stores a DTC.

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

A002AC8E45

  1. Connect the GTS to the DLC3.

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

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for at least 30 seconds.

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

  6. Enter the following menus: Powertrain / Engine / Data List / Calculate Load and Coolant Temperature.

  7. Start the engine and warm it up.

  8. Drive the vehicle for at least 3 seconds at the Calculate Load of 45% or more and the Coolant Temperature of 90°C (194°F) or higher [B].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  9. Stop the vehicle.

  10. Enter the following menus: Powertrain / Engine / Trouble Codes [C].

  11. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  13. Input the DTC: P059714.

  14. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P059712.

Click here

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Read freeze frame data using the GTS. 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 moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY


    1. Inspect the water inlet with thermostat sub-assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY Click here

    OK

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF WATER INLET WITH THERMOSTAT SUB-ASSEMBLY)

    A002AB3C11
    *a

    Front view of wire harness connector

    (to Water Inlet with Thermostat Sub-assembly)

    1. Disconnect the water inlet with thermostat sub-assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C82-1 (ETM+) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - WATER INLET WITH THERMOSTAT SUB-ASSEMBLY) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (WATER INLET WITH THERMOSTAT SUB-ASSEMBLY - ECM)


    1. Disconnect the water inlet with thermostat sub-assembly 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
      C82-2 (ETM-) - C1-64 (PTCR) Always Below 1 Ω
      C82-2 (ETM-) or C1-64 (PTCR) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P059714)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for at least 30 seconds.

    6. Start the engine.

    7. Turn the GTS on.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine / Trouble Codes.

    10. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P059714 is output B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE ECM Click here

  5. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - WATER INLET WITH THERMOSTAT SUB-ASSEMBLY)


    1. Disconnect the semiconductor pwr integration ECU connector.

    2. Disconnect the water inlet with thermostat sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1G-7 - C82-1 (ETM+) Always Below 1 Ω
      1G-7 or C82-1 (ETM+) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR