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Park / Neutral Position Switch Circuit: Procedure

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  1. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Disconnect the park/neutral position switch connector.
      Fig 1: Identifying C1 Connector Terminals
      GTY170837Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. 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
      P 1 - 3 and 4 - 9 Below 1 Ω
      Except P 10 kΩ or higher
      R 1 - 2 Below 1 Ω
      Except R 10 kΩ or higher
      N 1 - 8 and 4 - 9 Below 1 Ω
      Except N 10 kΩ or higher
      D, S, "+" and "-" 1 - 7 Below 1 Ω
      Except D, S, "+" and "-" 10 kΩ or higher

    NG → REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    OK: Go to next step 

  2. INSPECT TRANSMISSION CONTROL SWITCH 
    1. Connect the park/neutral position switch connector.
      Fig 2: Identifying E31 Connector Terminals
      GTY182884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the transmission control switch connector of the shift lock control unit assembly.
    3. 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
      S, "+" and "-" 3 - 7 Below 1 Ω
      Except S, "+" and "-" 10 kΩ or higher

    NG → REPLACE TRANSMISSION CONTROL SWITCH 

    OK: Go to next step 

  3. CHECK ECU TERMINAL VOLTAGE (STA TERMINAL) 
    1. Connect the transmission control switch connector of the shift lock control unit assembly.
      Fig 3: Checking ECU Terminal Voltage (STA Terminal)
      GTY184323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below while cranking the engine.

      Standard voltage

      Tester Connection Specified Condition
      STA (C56-10) - Body ground 9 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - ECM) 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - TCM) 
    1. Disconnect the TCM connector.
      Fig 4: Checking Harness And Connector
      GTY182461Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. 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
      R R (C56-15) - Body ground 10 to 14 V *
      Except R Below 1 V
      D D (C56-16) - Body ground 10 to 14 V
      Except D Below 1 V

      HINT: 

      *: The voltage will drop slightly because the back up light is turned on.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - TCM) 

    OK → REPLACE TCM 

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