AUTOMATIC TRANSMISSION SYSTEM Transmission Control Switch Circuit

DESCRIPTION

The transmission control switch detects when the shift lever is moved to M.

Using the transmission control switch, when the shift lever is in M, it is possible to select between 1st and 6th gears (M1 to M6).

Moving the shift lever to "+" once selects the next higher gear, and moving the shift lever to "-" once selects the next lower gear.

WIRING DIAGRAM

B003U3XE03

PROCEDURE


  1. INSPECT TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)


    1. B003V4RC28
      *a

      Component without harness connected

      (Transmission Control Switch for LHD)
      B003V4RC22
      *a

      Component without harness connected

      (Transmission Control Switch for RHD)

      Disconnect the transmission control switch connector.

    2. Measure resistance between each terminal of transmission control switch when the shift lever is moved to each position.

      Standard Resistance (for LHD)
      Tester Connection Condition Specified Condition
      4 - 5 M, "+" and "-" Below 1 Ω
      Except M, "+" and "-" 10 kΩ or higher
      3 - 2 Press continuously "+" (Up shift) Below 1 Ω
      M 10 kΩ or higher
      1 - 2 Press continuously "-" (Down shift) Below 1 Ω
      M 10 kΩ or higher
      Standard Resistance (for RHD)
      Tester Connection Condition Specified Condition
      4 - 5 M, "+" and "-" Below 1 Ω
      Except M, "+" and "-" 10 kΩ or higher
      1 - 2 Press continuously "+" (Up shift) Below 1 Ω
      M 10 kΩ or higher
      3 - 2 Press continuously "-" (Down shift) Below 1 Ω
      M 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY, BODY GROUND)


    1. B003VDTC21
      *a

      Front view of wire harness connector

      (to Transmission Control Switch)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      K80-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

    2. Turn the engine switch off position.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K80-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)


    1. Connect the transmission control switch connector.

    2. B003VBRC10
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the A77 ECM connector.

    3. Turn the engine 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
      Tester Connection Shift Position Specified Condition
      A77-16 (S) - Body ground M, "+" and "-" 11 to 14 V
      Except M, "+" and "-" Below 1 V

    4. Turn the engine switch off.

    5. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance
      Tester Connection Shift Position Specified Condition
      A77-8 (SFTU) - Body ground Press continuously "+" (Up shift) Below 1 Ω
      M 10 kΩ or higher
      A77-7 (SFTD) - Body ground Press continuously "-" (Down shift) Below 1 Ω
      M 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR