MULTI-MODE MANUAL TRANSAXLE SYSTEM Parking Brake Switch Circuit

DESCRIPTION

The transmission control ECU detects the ON/OFF status of the parking brake switch. When the parking brake is applied, the parking brake switch turns ON. When the parking brake is released, the switch turns OFF.

Tech Tips

When the brake pedal is not depressed with the gear in 1st, 2nd or reverse, the clutch is half-engaged, even if the accelerator pedal is not depressed. As a result, the vehicle can creep slowly like an automatic transmission vehicle. This assists the vehicle in preparing to move. The take off assist control is cancelled while the parking brake switch is ON.

WIRING DIAGRAM

A01387UE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT PARKING BRAKE SWITCH ASSEMBLY

    A0137SME01

    1. Remove the parking brake switch assembly.

    2. Check the parking brake switch resistance.

      Standard Resistance
      Tester Connections Ignition Switch Position Specified Conditions
      1 - Switch body

      OFF

      (When shaft pressed)

      		 10 kΩ or higher
      1 - Switch body

      ON

      (When shaft released)

      		 Below 1 Ω

    3. Reinstall the parking brake switch assembly.


    NG

    REPLACE PARKING BRAKE SWITCH ASSEMBLY

    OK

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - BODY GROUND)

    A0137MZE01

    1. Disconnect the transmission control ECU connector.

    2. Check the resistance.

      Standard Voltage
      Tester Connections Switch Conditions Specified Conditions
      PKB (A27-4) - Body ground OFF 10 kΩ or higher
      PKB (A27-4) - Body ground ON Below 1 Ω

    3. Reconnect the transmission control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT TRANSMISSION CONTROL ECU ASSEMBLY

    A0135VXE03

    1. Turn the ignition switch to ON.

    2. Measure the voltage between the terminal of transmission control ECU connector and the body ground when the parking brake switch is ON and OFF.

      Standard Voltage
      Tester Connections Switch Conditions Specified Conditions
      PKB (A27-4) - Body ground

      Parking brake switch

      OFF

      		 10 to 14 V
      PKB (A27-4) - Body ground

      Parking brake switch

      ON

      		 Below 1 V

    NG

    REPLACE TRANSMISSION CONTROL ECU ASSEMBLY

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE