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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (Automatic Transmission System (Aa81E, For 8AR-FTS) - Diagnostic Codes (4 Of 4) & Circuit Tests) >> AUTOMATIC TRANSMISSION SYSTEM (for 8AR-FTS) >> Transmission Control Switch Circuit [09/2020 - ] >> Procedure

Transmission Control Switch Circuit [09/2020 - ]: Procedure

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  1. INSPECT TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY) 
    1. Disconnect the K80 transmission floor shift assembly (transmission control switch) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY497942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Floor Shift Assembly (Transmission Control Switch))

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (IG) - 5 (S) Shift lever in M, "+" and "-" Below 1 Ω
      Shift lever not in M, "+" and "-" 10 kΩ or higher
      3 (SFTU) - 2 (E) Shift lever held in "+" (Up shift) Below 1 Ω
      Shift lever in M 10 kΩ or higher
      1 (SFTD) - 2 (E) Shift lever held in "-" (Down shift) Below 1 Ω
      Shift lever in M 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSMISSION FLOOR SHIFT ASSEMBLY (TRANSMISSION CONTROL SWITCH). Refer to  COMPONENTS [09/2020 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY, BODY GROUND) 
    1. Turn the engine switch on (IG).
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      K80-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
    3. Turn the engine switch off.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K80-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY, BODY GROUND) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 
    1. Connect the K80 transmission floor shift assembly (transmission control switch) connector.
    2. Disconnect the A91 ECM connector.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A91-59 (S) - Body ground Shift lever in M, "+" and "-" 11 to 14 V
      Shift lever not in M, "+" and "-" Below 1 V
    5. Turn the engine switch off.
    6. Disconnect the spiral cable sub-assembly connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A91-42 (SFTU) - Body ground Shift lever held in "+" (Up shift) Below 1 Ω
      Shift lever in M 10 kΩ or higher
      A91-43 (SFTD) - Body ground Shift lever held in "-" (Down shift) Below 1 Ω
      Shift lever in M 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 

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