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 the brake pedal condition whether the pedal is depressed or released from 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 and sets the DTC.

DTC No. DTC Detection Conditions Trouble Areas
P0703

Following conditions detected simultaneously for 1.0 second or more

(1 trip detection logic)


  1. Ignition switch ON

  2. STP signal OFF

  3. ST1- signal OFF

  • Open or short in STP or ST1- signal circuits

  • Stop light switch assembly

  • Transmission control ECU

WIRING DIAGRAM

A01363RE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester ON.

    3. Select the following menu items: Powertrain / Multi-Mode M/T / Data List / Brake Switch Signal1, Brake Switch Signal2 and STP Switch Signal.

    4. Read the value, and check the stop light operation.

      Items

      [Abbreviation]

      		 Measurement Items: Display Normal Conditions Diagnostic Notes

      Brake Switch Signal1

      [Brake SW Sig1]

      Brake switch signal (STP):

      Open (OFF) or Gnd (ON)

      Gnd: Brake pedal depressed

      Open: Brake pedal released

      		 STP terminal signal of transmission control ECU

      Brake Switch Signal2

      [Brake SW Sig2]

      Brake switch signal (ST1-):

      Open (OFF) or Gnd (ON)

      Open: Brake pedal depressed

      Gnd: Brake pedal released

      		 ST1- terminal signal of transmission control ECU

      STP Switch Signal

      [STP SW Sig]

      Brake operation signal:

      ON or OFF

      ON: Operated

      OFF: Not operated

      		 -
      OK
      The normal conditions listed above are shown on the tester when the brake pedal is operated.

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY

    A0138Y7E02

    1. Disconnect the stop light switch assembly connector.

    2. Check the resistance.

      Standard Resistance
      Switch Positions Tester Connections Specified Conditions
      Switch pin released 1-2 Below 1 Ω
      Switch pin released 3-4 10 kΩ or higher
      Switch pin pushed in 1-2 10 kΩ or higher
      Switch pin pushed in 3-4 Below 1 Ω

    3. Reconnect the stop light switch assembly connector.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    OK

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

    A0136APE01

    1. Disconnect the stop light switch assembly connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage between the terminals of stop light switch assembly connector.

      Standard Voltage
      Tester Connections Specified Conditions
      A17-2 - Body ground 10 to 14 V
      A17-3 - Body ground 10 to 14 V

    4. Reconnect the stop light switch assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT TRANSMISSION CONTROL ECU ASSEMBLY

    A0137MZE04

    1. Disconnect the transmission control ECU connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage between the terminals of transmission control ECU connector.

      Standard Voltage
      Pedal Conditions Tester Connections Specified Conditions
      Depressed

      STP (A27-34) - Body

      ground

      		 10 to 14 V
      Released

      STP (A27-34) - Body

      ground

      		 Below 1 V
      Depressed

      ST1- (A27-35) - Body

      ground

      		 Below 1 V
      Released

      ST1- (A27-35) - Body

      ground

      		 10 to 14 V

    4. Reconnect the transmission control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - TRANSMISSION CONTROL ECU)

    OK

    REPLACE TRANSMISSION CONTROL ECU ASSEMBLY