LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> IS F >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle >> Automatic Transmission System >> Transmission Control Switch Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

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

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      J43-5 (E) - Body ground Always Below 1 Ω
    4. Fig 1: Identifying J43 Transmission Control Switch Connector Terminal
      G05750785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY) 
    1. Disconnect the transmission control switch connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      J43-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
    4. Fig 2: Identifying J43 Transmission Control Switch Connector Terminal
      G05750785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  3. INSPECT TRANSMISSION CONTROL SWITCH 
    1. Disconnect the transmission control switch connector.
    2. Measure the resistance between each terminal of the transmission control switch when the shift lever is moved to each position.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      3 (IG) - 7 (S) Shift lever in M, "+" or "-" Below 1 Ω
      Shift lever not in M, "+" or "-" 10 kΩ or higher
      2 (SFTU) - 5 (E) Shift lever held in "+" (Up-shift) Below 1 Ω
      Shift lever not held in "+" 10 kΩ or higher
      1 (SFTD) - 5 (E) Shift lever held in "-" (Down-shift) Below 1 Ω
      Shift lever not held in "-" 10 kΩ or higher
      Fig 3: Identifying Transmission Control Switch Connector Terminal
      G04948381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE TRANSMISSION CONTROL SWITCH  (See REMOVAL  )

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 
    1. Connect the transmission control switch connector.
    2. Disconnect the ECM connector.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A6-16 (S) - Body ground
      • Engine switch on (IG)
      • Shift lever in M, "+" or "-"
      11 to 14 V
      A6-16 (S) - Body ground
      • Engine switch on (IG)
      • Shift lever not in M, "+" or "-"
      Below 1 V
      Fig 4: Identifying ECM Connector Terminal
      G05750788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Turn the engine switch off.
    6. Disconnect the spiral cable connector
    7. Measure the resistance according to the value(s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A6-8 (SFTU) - Body ground Shift lever held in "+" (Up-shift) Below 1 Ω
      Shift lever not held in "+" 10 kΩ or higher
      A6-7 (SFTD) - Body ground Shift lever held in "-" (Down-shift) Below 1 Ω
      Shift lever not held in "-" 10 kΩ or higher
    8. Fig 5: Identifying A6 ECM Connector Terminal
      G05750789Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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