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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 76 (Automatic Transaxle System (K120) - Diagnostic Codes (5 Of 5) & Circuit Tests) >> K120 Continuously Variable Transaxle System >> Transmission Control Switch Circuit [11/2022 - 09/2024] >> Procedure

Transmission Control Switch Circuit [11/2022 - 09/2024]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT 
    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 / Transmission / Trouble Codes.

      Powertrain > Transmission > Trouble Codes 

    5. Read the DTCs using the Techstream.

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO DTC CHART 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - 09/2024]

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (SHIFT SW STATUS (S RANGE)) 
    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 / Transmission / Data List.
    5. According to the display on the Techstream, read the Data List.

      Powertrain > Transmission > Data List 

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

      Powertrain > Transmission > 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  8

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (SPORT SHIFT UP SW AND SPORT SHIFT DOWN SW) 
    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 / Transmission / Data List.
    5. According to the display on the Techstream, read the Data List.

      Powertrain > Transmission > 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 "+" or "+" shift paddle switch operated
      • OFF: Shift lever not held in "+" and "+" shift paddle switch released
      		 -
      Sport Shift Down SW Sport shift down switch status ON or OFF
      • ON: Shift lever held in "-" or "-" shift paddle switch operated
      • OFF: Shift lever not held in "-" and "-" shift paddle switch released
      		 -

      Powertrain > Transmission > 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 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [06/2018 - 09/2024]

    Result: 

    B 

    See step  4

  4. INSPECT SHIFT LOCK CONTROL UNIT ASSEMBLY (TRANSMISSION CONTROL SWITCH) 
    1. Disconnect the I16 shift lock control unit assembly connector.
      GTY488976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Shift Lock Control Unit Assembly (Transmission Control Switch))
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (SFTU) - 2 (E) Shift lever held in "+" Below 1 Ω
      3 (SFTU) - 2 (E) Shift lever in M 10 kΩ or higher
      1 (SFTD) - 2 (E) Shift lever held in "-" Below 1 Ω
      1 (SFTD) - 2 (E) Shift lever in M 10 kΩ or higher
    3. Connect the I16 shift lock control unit assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY 

    Refer to COMPONENTS [06/2018 - ]

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (SHIFT LOCK CONTROL UNIT ASSEMBLY - BODY GROUND) 
    1. Disconnect the I16 shift lock control unit assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I16-2 (E) - Body ground Always Below 1 Ω
    3. Connect the I16 shift lock control unit assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SHIFT LOCK CONTROL UNIT ASSEMBLY - BODY GROUND) 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (SHIFT LOCK CONTROL UNIT ASSEMBLY - TCM) 
    1. Disconnect the C80 TCM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C80-28 (SFTU) - Body ground Shift lever held in "+" Below 1 Ω
      C80-28 (SFTU) - Body ground Shift lever in M 10 kΩ or higher
      C80-27 (SFTD) - Body ground Shift lever held in "-" Below 1 Ω
      C80-27 (SFTD) - Body ground Shift lever in M 10 kΩ or higher
    3. Connect the C80 TCM connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SHIFT LOCK CONTROL UNIT ASSEMBLY - TCM) 

    Result: 

    OK 

    See step  7

  7. REPLACE TCM 
    1. Replace the TCM.

      Refer to COMPONENTS [03/2019 - 09/2024]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION AND INITIALIZATION 

    for Registration: Refer to REGISTRATION [06/2018 - 09/2024]

    for Initialization: Refer to INITIALIZATION [11/2022 - 09/2024]

  8. INSPECT SHIFT LOCK CONTROL UNIT ASSEMBLY (TRANSMISSION CONTROL SWITCH) 
    1. Disconnect the I16 shift lock control unit assembly connector.
      GTY436101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Shift Lock Control Unit Assembly (Transmission Control Switch))
    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 M Below 1 Ω
      4 (IG) - 5 (S) Shift lever not in M 10 kΩ or higher
    3. Connect the I16 shift lock control unit assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY 

    Refer to COMPONENTS [06/2018 - ]

    Result: 

    OK 

    See step  9

  9. INSPECT SHIFT LOCK CONTROL UNIT ASSEMBLY (POWER SOURCE) 
    1. Disconnect the I16 shift lock control unit assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I16-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      I16-4 (IG) - Body ground Engine switch off Below 1 V
    3. Connect the I16 shift lock control unit assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHECK POWER SOURCE CIRCUIT (SHIFT LOCK CONTROL UNIT ASSEMBLY) 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (SHIFT LOCK CONTROL UNIT ASSEMBLY - TCM) 
    1. Disconnect the C80 TCM connector.
    2. Disconnect the I16 shift lock control unit assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I16-5 (S) - C80-14 (S) Always Below 1 Ω
      I16-5 (S) or C80-14 (S) - Body ground and other terminals Always 10 kΩ or higher
    4. Connect the C80 TCM connector.
    5. Connect the I16 shift lock control unit assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SHIFT LOCK CONTROL UNIT ASSEMBLY - TCM) 

    Result: 

    OK 

    See step  11

  11. REPLACE TCM 
    1. Replace the TCM.

      Refer to COMPONENTS [03/2019 - 09/2024]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION AND INITIALIZATION 

    for Registration: Refer to REGISTRATION [06/2018 - 09/2024]

    for Initialization: Refer to INITIALIZATION [11/2022 - 09/2024]

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