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Home >> Toyota >> 2022 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Engine Control System (A25A-FXS) (W/ Canister Pump Module) - Diagnostic Codes (07 Of 13)) >> SFI SYSTEM (w/ Canister Pump Module) >> DTC P0597-14: Thermostat Heater Control Circuit Short to Ground or Open [02/2019 - 06/2020] >> Procedure

DTC P0597-14: Thermostat Heater Control Circuit Short to Ground or Open [02/2019 - 06/2020]: Procedure

WARNING: This page is about a different car, the 2020 Toyota RAV4 and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF THERMOSTAT HEATER (WATER INLET WITH THERMOSTAT SUB-ASSEMBLY)) 
    GTY913167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Water Inlet with Thermostat Sub-assembly)
    1. Disconnect the thermostat heater (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
      F5-1 (ETM+) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. INSPECT THERMOSTAT HEATER (WATER INLET WITH THERMOSTAT SUB-ASSEMBLY) 
    1. Inspect the thermostat heater (water inlet with thermostat sub-assembly).

      Refer to INSPECTION [11/2018 - 12/2021]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE THERMOSTAT HEATER (WATER INLET WITH THERMOSTAT SUB-ASSEMBLY) 

    Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (THERMOSTAT HEATER (WATER INLET WITH THERMOSTAT SUB-ASSEMBLY) - ECM) 
    1. Disconnect the thermostat heater (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
      F5-2 (ETM-) - C45-7 (HTHM) Always Below 1 Ω
      F5-2 (ETM-) or C45-7 (HTHM) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [02/2019 - 08/2020]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. INSPECT EFI-MAIN NO. 2 RELAY 
    1. Inspect the EFI-MAIN NO. 2 relay.

      Refer to PROCEDURE - Step 2

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE EFI-MAIN NO. 2 RELAY 

    Result: 

    OK 

    See step  5

  5. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY) 
    GTY853759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
    *2 EFI-MAIN NO. 2 Relay
    1. Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      3 (EFI-MAIN NO. 2 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 2 RELAY) 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND) 
    1. Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (EFI-MAIN NO. 2 relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - THERMOSTAT HEATER (WATER INLET WITH THERMOSTAT SUB-ASSEMBLY)) 
    1. Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the thermostat heater (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
      5 (EFI-MAIN NO. 2 relay) - F5-1 (ETM+) Always Below 1 Ω
      5 (EFI-MAIN NO. 2 relay) or F5-1 (ETM+) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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