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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (Engine Control System (A25A-FKS) - Diagnostic Codes (11 Of 12)) >> SFI System >> DTC P2681-11: Engine Coolant Bypass Valve Circuit Short to Ground; DTC P2681-15: Engine Coolant Bypass Valve Circuit Short to Battery or Open [08/2020 - 08/2021] >> Procedure

DTC P2681-11: Engine Coolant Bypass Valve Circuit Short to Ground; DTC P2681-15: Engine Coolant Bypass Valve Circuit Short to Battery or Open [08/2020 - 08/2021]: Procedure

WARNING: This page is about a different car, the 2024 Lexus ES 250, 2023 Lexus ES 250, 2022 Lexus ES 250, and 2021 Lexus ES 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FLOW SHUTTING VALVE (FOR HEATER CONTROL)) 
    GTY948423Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Flow Shutting Valve (for Heater Control) (Water By-pass Hose Assembly))
    1. Disconnect the flow shutting valve (for heater control) (water by-pass hose assembly) connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C69-2 - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - FLOW SHUTTING VALVE (FOR HEATER CONTROL)) 

    Result: 

    OK 

    See step  2

  2. INSPECT FLOW SHUTTING VALVE (FOR HEATER CONTROL) (WATER BY-PASS HOSE ASSEMBLY) 
    1. Inspect the flow shutting valve (for heater control) (water by-pass hose assembly).

      Refer to INSPECTION [08/2020 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOW SHUTTING VALVE (FOR HEATER CONTROL) (WATER BY-PASS HOSE ASSEMBLY). Refer to  REMOVAL [08/2020 - 08/2021] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (FLOW SHUTTING VALVE (FOR HEATER CONTROL) - ECM) 
    1. Disconnect the flow shutting valve (for heater control) (water by-pass hose 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
      C69-1 - C77-42 (WSV1) Always Below 1 Ω
      C69-1 or C77-42 (WSV1) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [08/2020 - 08/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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