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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) >> Shift Paddle Switch Circuit [09/2020 - ] >> Procedure

Shift Paddle Switch Circuit [09/2020 - ]: Procedure

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  1. CHECK HARNESS AND CONNECTOR (SHIFT PADDLE SWITCH - ECM) 
    1. Disconnect the A91 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A91-42 (SFTU) - A91-41 (ECCS) Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher
      A91-43 (SFTD) - A91-41 (ECCS) Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    See step  2

  2. CHECK WIRE HARNESS AND CONNECTORS (ECM - BODY GROUND) 
    1. Disconnect the F78 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F78-53 (E1) - Body ground Always Below 1 Ω

      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 (ECM - BODY GROUND) 

  3. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM) 
    1. Disconnect the K26 spiral cable sub-assembly connector.
    2. Disconnect the A91 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A91-42 (SFTU) - K26-8 (SUP) Always Below 1 Ω
      A91-43 (SFTD) - K26-1 (SDN) Always Below 1 Ω
      A91-41 (ECCS) - K26-2 (ECC) Always Below 1 Ω
      A91-42 (SFTU) or K26-8 (SUP) - Body ground Always 10 kΩ or higher
      A91-43 (SFTD) or K26-1 (SDN) - Body ground Always 10 kΩ or higher
      A91-41 (ECCS) or K26-2 (ECC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM) 

    Result: 

    OK 

    See step  4

  4. INSPECT SPIRAL CABLE SUB-ASSEMBLY 
    1. Inspect the spiral cable sub-assembly.

      Refer to INSPECTION [10/2016 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  COMPONENTS [10/2016 - ] 

    Result: 

    OK 

    See step  5

  5. INSPECT TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH LH) 
    1. Remove the transmission shift switch assembly (shift paddle switch LH).

      Refer to REMOVAL [10/2016 - ]

      GTY512901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Shift Paddle Switch LH (Transmission Shift Switch Assembly))
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B-1 (SDN) - B-2 (ECC) Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH LH). Refer to  COMPONENTS [10/2016 - ] 

    Result: 

    OK 

    See step  6

  6. INSPECT TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH RH) 
    1. Remove the transmission shift switch assembly (shift paddle switch RH).
      GTY497450Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Shift Paddle Switch RH (Transmission Shift Switch Assembly))

      Refer to REMOVAL [10/2016 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-3 (SUP) - A-2 (ECC) Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH RH). Refer to  COMPONENTS [10/2016 - ] 

    Result: 

    OK 

    See step  7

  7. INSPECT NO. 1 SWITCH WIRE 
    1. Install the transmission shift switch assembly.
      GTY674107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Steering Pad Switch Assembly)

      Refer to INSTALLATION [10/2016 - ]

    2. Disconnect the z15 No. 1 switch wire connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z15-1 (SUP) - z15-4 (ECC) Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher
      z15-3 (SDN) - z15-4 (ECC) Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ 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 

    REPLACE NO. 1 SWITCH WIRE. Refer to  COMPONENTS [10/2016 - ] 

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