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Transmission Control Switch Circuit: Procedure

WARNING: This page is about a different car, the 2010 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH) 
    1. Disconnect the transmission control switch connector of shift lock control unit assembly.
      Fig 1: Checking Harness And Connector (Transmission Control Switch - Body Ground)
      GTY200937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Switch Condition Tester Connection Specified Condition
      Ignition switch ON (IG) 3 - Body ground 10 to 14 V
      Ignition switch OFF Below 1 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: Checking Harness And Connector (Transmission Control Switch - Body Ground)
      GTY200937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Specified Condition
      5 - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT TRANSMISSION CONTROL SWITCH 
    1. Measure the resistance between each terminal of the shift lock control unit assembly when the shift lever is moved to each position.
      Fig 3: Identifying E31 Connector Terminals
      GTY182884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Shift Position Tester Connection Specified Condition
      S, "+" and "-" 3 - 7 Below 1 Ω
      Except S, "+" and "-" 10 kΩ or higher
      Press continuously
      "+"
      (Up shift)      		 2 - 5 Below 1 Ω
      S 10 kΩ or higher
      Press continuously
      "-"
      (Down shift)      		 1 - 5 Below 1 Ω
      S 10 kΩ or higher

    NG → REPLACE TRANSMISSION CONTROL SWITCH 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 
    1. Connect the transmission control switch connector of the shift lock control unit assembly.
      Fig 4: Identifying ECM Connector Terminals
      GTY210024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A55 ECM connector.
    3. Turn the ignition switch on (IG), and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

      Standard voltage

      Shift Position Tester Connection Specified Condition
      S, "+" and "-" A55-25 (S) - Body ground 10 to 14 V
      Except S, "+" and "-" Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the ECM connector.
    6. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard resistance

      Shift Position Tester Connection Specified Condition
      Press continuously
      "+"
      (Up shift)      		 A55-16 (SFTU) - Body ground Below 1 Ω
      S 10 kΩ or higher
      Press continuously
      "-"
      (Down shift)      		 A55-51 (SFTD) - Body ground Below 1 Ω
      S 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → PROCEED TO  ELECTRONIC CIRCUIT INSPECTION PROCEDURE 

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