AUTOMATIC TRANSMISSION SYSTEM Transmission Control Switch Circuit

DESCRIPTION

After moving the shift lever to M*1 or S*2, it is possible to switch the shift range between "1" and "8" using the transmission control switch.

Moving the shift lever to "+" once raises the shift range by one, and moving the shift lever to "-" lowers the shift range by one.

*1: w/ Shift Paddle Switch

*2: w/o Shift Paddle Switch

Tech Tips

Depending on the specifications of the vehicle, the shift lever will have an "S" or "M" position. The following inspection procedure refers to this position as the "S" shift lever position.

WIRING DIAGRAM

A001BEUE06

PROCEDURE


  1. INSPECT TRANSMISSION CONTROL SWITCH


    1. A001DLYE38
      *1 Component without harness connected: (Transmission Control Switch)

      Disconnect the L42 transmission control switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (IG) - 7 (S) Shift lever in S, "+" or "-" Below 1 Ω
      2 (SFTU) - 5 (E)

      Shift lever held in "+"

      (Up-shift)

      		 Below 1 Ω
      1 (SFTD) - 5 (E)

      Shift lever held in "-"

      (Down-shift)

      		 Below 1 Ω
      3 (IG) - 7 (S) Shift lever not in S, "+" or "-" 10 kΩ or higher
      2 (SFTU) - 5 (E) Shift lever in S 10 kΩ or higher
      1 (SFTD) - 5 (E) Shift lever in S 10 kΩ or higher

    NG

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

    OK

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


    1. A001DBCE02
      *1 Front view of wire harness connector: (to Transmission Control Switch)

      Disconnect the L42 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
      Tester Connection Switch Condition Specified Condition
      L42-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      L42-3 (IG) - Body ground Engine switch off Below 1 V

    4. Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L42-5 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A001CG4E01
      *1 Component with harness connected: (ECM)

      Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A13-16 (S) - Body ground

      • Engine switch on (IG)

      • Shift lever in S, "+" or "-"

      		 11 to 14 V
      A13-16 (S) - Body ground

      • Engine switch on (IG)

      • Shift lever not in S, "+" or "-"

      		 Below 1 V
    3. A001FLOE01
      *1 Rear view of wire harness connector: (to ECM)

      Turn the engine switch off.

    4. Disconnect the A13 ECM connector.

    5. w/ Shift Paddle Switch:

      Disconnect the transmission shift switch assembly (shift paddle switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-8 (SFTU) - Body ground

      Shift lever held in "+"

      (Up-shift)

      		 Below 1 Ω
      A13-7 (SFTD) - Body ground

      Shift lever held in "-"

      (Down-shift)

      		 Below 1 Ω
      A13-8 (SFTU) - Body ground Shift lever in S 10 kΩ or higher
      A13-7 (SFTD) - Body ground Shift lever in S 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR