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 transmission control ECU detects whether the brake pedal is depressed or released using those signal input. If the signal conditions, STP and ST1-, do not match the standard condition, the transmission control ECU interprets this as a malfunction in the stop light switch circuit and sets the DTC.

DTC No. DTC Detection Condition Trouble Area
P0703

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

  • Transmission control ECU

WIRING DIAGRAM

A0135WFE03

INSPECTION PROCEDURE

Note

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

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. In accordance with the display on the tester, read the Data List.

      Multi-Mode M/T
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note

      Brake Switch Signal2

      [Brake SW Sig2]

      Brake switch signal (ST1-):

      Open (OFF) or Gnd (ON)

      Open (OFF): Brake pedal depressed

      Gnd (ON): Brake pedal released

      		 ST1- terminal signal of transmission control ECU

      Brake Switch Signal1

      [Brake SW Sig1]

      Brake switch signal (STP):

      Open (OFF) or Gnd (ON)

      Open (OFF): Brake pedal released

      Gnd (ON): Brake pedal depressed

      		 STP terminal signal of transmission control ECU
      OK
      The normal conditions listed above are shown on the tester when the brake pedal is operated.

    NG

    CHECK STOP LIGHT SWITCH INSTALLATION Click here

    OK

    SYMPTOM SIMULATION AND DTC CHECK Click here

  2. CHECK STOP LIGHT SWITCH INSTALLATION


    1. Check the stop light switch installation Click here.

      OK
      Stop light switch is installed correctly.

    NG

    SECURELY REINSTALL STOP LIGHT SWITCH

    OK

  3. INSPECT STOP LIGHT SWITCH


    1. A0136IGE01
      Text in Illustration
      *a

      Component without harness connected

      (Stop Light Switch)
      *b Released
      *c Pushed in

      Disconnect the A17 stop light switch connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Stop light switch pin released Below 1 Ω
      Stop light switch pin pushed in 10 kΩ or higher
      3 - 4 Stop light switch pin released 10 kΩ or higher
      Stop light switch pin pushed in Below 1 Ω

    NG

    REPLACE STOP LIGHT SWITCH Click here

    OK

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


    1. A0138LUE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Switch)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A17-2 - Body ground Always 11 to 14 V
      A17-3 - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - TRANSMISSION CONTROL ECU)


    1. Reconnect the A17 stop light switch connector.

    2. Disconnect the A27 transmission control ECU 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
      A27-34 (STP) - Body ground Brake pedal is depressed 11 to 14 V
      Brake pedal is released Below 1 V
      A27-35 (ST1-) - Body ground Brake pedal is depressed Below 1 V
      Brake pedal is released 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE TRANSMISSION CONTROL ECU


    1. Replace the transmission control ECU Click here.


    NEXT

  7. PERFORM INITIALIZATION


    1. Perform the initialization and learning for multi-mode manual transaxle system Click here.


    NEXT

    END