MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0703

DTC Code DTC Name
P0703 Brake Switch "B" Circuit

DESCRIPTION

When the brake pedal is depressed, stop light switch signal STP turns on and stop light switch signal ST1- turns off. The TCM detects whether the brake pedal is depressed or released based on those signals. If the signal conditions, STP and ST1-, do not match the standard condition, the TCM interprets this as a malfunction in the stop light switch circuit and stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Memory

P0703

Brake Switch "B" Circuit

Following conditions detected simultaneously for 1.0 second or more:

(1-trip detection logic)

  1. Ignition switch is ON.

  2. STP signal is OFF.

  3. ST1- signal is OFF.

  • Wire harness or connector

  • Stop light switch

  • TCM

Does not come on

Comes on

DTC stored

WIRING DIAGRAM

C303964E02

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

  1. READ VALUE USING GTS (BRAKE SWITCH SIGNAL 1 AND 2)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Multi-Mode M/T / Data List / Brake Switch Signal1 and Brake Switch Signal2.

    5. Read the Data List according to the display on the GTS.

      Powertrain > Multi-Mode M/T > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Brake Switch Signal2

      Brake switch signal (ST1-)

      OFF or ON

      OFF: Brake pedal depressed

      ON: Brake pedal released

      ST1- terminal signal of TCM

      Brake Switch Signal1

      Brake switch signal (STP)

      OFF or ON

      OFF: Brake pedal released

      ON: Brake pedal depressed

      STP terminal signal of TCM

      Powertrain > Multi-Mode M/T > Data List

      Tester Display

      Brake Switch Signal2

      Brake Switch Signal1

      OK

      When the brake pedal is operated, the display changes as shown above.

    Result

    Proceed to

    OK

    NG
    OK

    SYMPTOM SIMULATION AND DTC CHECK

    Click here

    NG

  2. INSPECT STOP LIGHT SWITCH

    1. Inspect the stop light switch.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE STOP LIGHT SWITCH

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BATTERY - STOP LIGHT SWITCH)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A20-2 - Body ground

      Always

      11 to 14 V

      A20-4 - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - TCM)

    1. C234394C03

      *a

      Front view of wire harness connector

      (to TCM)

      Reconnect the stop light switch connector.

    2. Disconnect the TCM connector.

    3. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A26-34 (STP) - Body ground

      Brake pedal depressed

      11 to 14 V

      Brake pedal released

      Below 1 V

      A26-35 (ST1-) - Body ground

      Brake pedal depressed

      Below 1 V

      Brake pedal released

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE TCM

    1. Replace the TCM.

      Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR