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Transmission Control Switch Circuit [08/2020 - 12/2021]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ VALUE USING TECHSTREAM (Shift SW Status (S Range)) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Shift SW Status (S Range).
    5. Read the Data List according to the display on the Techstream.

      Powertrain > Engine > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift SW Status (S Range) Sport (S) mode select switch status ON or OFF
      • ON: Shift lever in S, "+" or "-"
      • OFF: Shift lever not in S, "+" or "-"
      		 -

      Powertrain > Engine > Data List 

      Tester Display
      Shift SW Status (S Range)

      Result

      Result Proceed to
      Data List value is normal A
      Data List value is not normal B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (SPORT SHIFT UP SW AND SPORT SHIFT DOWN SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Sport Shift Up SW and Sport Shift Down SW.
    5. Read the Data List according to the display on the Techstream.

      Powertrain > Engine > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Sport Shift Up SW Sport shift up switch status ON or OFF
      • ON: Shift lever held in "+"
      • OFF: Shift lever not held in "+"
      		 -
      Sport Shift Down SW Sport shift down switch status ON or OFF
      • ON: Shift lever held in "-"
      • OFF: Shift lever not held in "-"
      		 -

      Powertrain > Engine > Data List 

      Tester Display
      Sport Shift Up SW
      Sport Shift Down SW

      Result

      Result Proceed to
      Data List values are normal A
      Data List values are not normal B

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2020 - ] 

    Result: 

    B 

    See step  3

  3. INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    1. Disconnect the transmission control switch connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY682737Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Control Switch (Shift Lock Control Unit Assembly))

      Standard Resistance

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY). Refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) 
    1. Disconnect the transmission control switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G23-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 
    1. Connect the transmission control switch 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
      A24-20 (SFTU) - Body ground Shift lever held in "+" (Up shift) Below 1 Ω
      A24-20 (SFTU) - Body ground Shift lever not held in "+" 10 kΩ or higher
      A24-19 (SFTD) - Body ground Shift lever held in "-" (Down shift) Below 1 Ω
      A24-19 (SFTD) - Body ground Shift lever not held in "-" 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 [08/2020 - ] 

    Result: 

    NG 

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

  6. INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    1. Disconnect the transmission control switch connector.
      GTY658972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Control Switch (Shift Lock Control Unit Assembly))
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (IG) - 5 (S) Shift lever in S, "+" or "-" Below 1 Ω
      Shift lever not in S, "+" or "-" 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY). Refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH (POWER SOURCE)) 
    1. Disconnect the transmission control switch 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
      G23-4 (IG) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH (POWER SOURCE)) 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 
    1. Disconnect the transmission control switch 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
      G23-5 (S) - A24-14 (S) Always Below 1 Ω
      G23-5 (S) or A24-14 (S) - Body ground and other terminals Always 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 [08/2020 - ] 

    Result: 

    NG 

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

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