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Home › Lexus › 2007 › IS 250 RWD, Automatic › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transaxle - A960E › Automatic Transmission System › Transmission Control Switch Circuit › Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH) 
    1. Disconnect the transmission control switch connector of shift lock control unit assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATIONS

      Switch Condition Tester Connection Specified Condition
      Engine switch on (IG) 3 - Body ground 10 to 14 V
      Engine switch off ↑ Below 1 V
      Fig 1: Identifying J43 Connector Terminals
      G05318127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

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

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      5. Body ground Below 1 Ω
      Fig 2: Identifying J43 Connector Terminals (Wire Harness Side)
      G05318127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT TRANSMISSION CONTROL SWITCH 
    1. Measure resistance between each terminal of shift lock control unit assembly when the shift lever is moved to each position.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      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
      Fig 3: Identifying Terminals Of Transmission Control Switch Connector
      G05318129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 shift lock control unit assembly.
    2. Disconnect the ECM connector.
    3. Turn the engine switch on (IG) position, and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATIONS

      Shift Position Tester Connection Specified Condition
      S, "+" and "-" A6-9 (S) - Body ground 10 to 14 V
      Except S, "+" and "-" ↑ Below 1 V
      Fig 4: Identifying ECM A6 Connector
      G05318130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Turn the engine switch off position.
    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 

      STANDARD RESISTANCE SPECIFICATIONS

      Shift Position Tester Connection Specified Condition
      Press continuously "+" (Up shift) A6-30 (SFTU) - Body ground Below 1 Ω
      S ↑ 10 kΩ or higher
      Press continuously "-" (Down shift) A6-19 (SFTD) - Body ground Below 1 Ω
      S ↑ 10 kΩ or higher
      Fig 5: Identifying ECM A6 Connector
      G05318131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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