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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System - Diagnostic Codes (13 Of 14) >> SFI System >> DTC P2533-14: Ignition Switch On/Start Position Circuit Low Circuit Short to Ground or Open [10/2023 - ] >> Procedure
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DTC P2533-14: Ignition Switch On/Start Position Circuit Low Circuit Short to Ground or Open [10/2023 - ]: Procedure

  1. READ VALUE USING TECHSTREAM (IGR) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / IGR.

      Powertrain > Engine > Data List 

      Tester Display
      IGR
    5. Read the Data List.

      Result

      Result Proceed to
      The value of IGR is ON A
      None of the above conditions are met B

    Result: 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [12/2017 - ] 

    Result: 

    See step  2

  2. CHECK TERMINAL VOLTAGE (IGR VOLTAGE) 
    1. Disconnect the ECM 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 Switch Condition Specified Condition
      A95-12 (IGR) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECM) 

    Pre-procedure1

    1. Disconnect the ECM connector.
    2. Disconnect the instrument panel junction block assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      8E-13 - A95-12 (IGR) Always Below 1 Ω
      8E-13 or A95-12 (IGR) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND) 

    Pre-procedure1

    1. Disconnect the instrument panel junction block assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      8B-36 - Body ground Always Below 1 Ω
      8C-41 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR