AUTOMATIC TRANSMISSION SYSTEM Stop Light Switch Circuit

DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling while driving in the lock-up condition when the brakes are suddenly applied.

When the brake pedal is depressed, this switch sends signals to the ECM. Then the ECM cancels the operation of the lock-up clutch during braking.

WIRING DIAGRAM

A01J65QE05

INSPECTION PROCEDURE

Tech Tips

Using the intelligent tester's Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to save time.


  1. Warm up the engine.

  2. Turn the ignition switch OFF.

  3. Connect the intelligent tester to the DLC3.

  4. Turn the ignition switch ON and push the tester main switch ON.

  5. Enter the following menus: Powertrain / Engine and ECT / Data List.

  6. Follow the instructions on the tester and read the Data List.

Tester Display Measurement Item/Range Normal Condition Diagnostic Note
Stop Light Switch

Stop light switch status/

ON or OFF

Brake pedal is


  • ON: Depressed

  • OFF: Released

 -

Note

In the table above, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

PROCEDURE


  1. INSPECT STOP LIGHT SWITCH


    1. A01J7MUE03

      Remove the S14 stop light switch.

    2. Measure the resistance of the switch.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Pin pushed (pedal released) 10 kΩ or higher
      1 - 2 Pin not pushed (pedal depressed) Below 1 Ω
      3 - 4 Pin pushed (pedal released) Below 1 Ω
      3 - 4 Pin not pushed (pedal depressed) 10 kΩ or higher

    NG

    REPLACE STOP LIGHT SWITCH

    OK

  2. CHECK WIRE HARNESS (ECM - BATTERY)


    1. A01J5GRE02

      Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      E9-4 (STP) - Body ground Brake pedal is depressed 10 to 14 V
      E9-4 (STP) - Body ground Brake pedal is released Below 1 V

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM