AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P070312

DTC Code DTC Name
P070312 Brake Switch "B" Circuit Short to Battery

DESCRIPTION

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

When the brake pedal is depressed, this switch sends a signal to the ECM. Then the ECM cancels the operation of the lock-up clutch while braking is in progress.

DTC No. DTC Detection Condition Trouble Area
P070312

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. The engine switch is on (IG) and battery voltage is 8 V or more.

  2. The stop light switch remains on.

  3. The vehicle is driven in a GO (30 km/h (19 mph) or more) and STOP (less than 3 km/h (2 mph)) pattern 5 times

  4. 2-trip detection logic

  • Wire harness or connector

  • Short in stop light switch signal circuit

  • Stop light switch assembly

  • ECM

MONITOR DESCRIPTION

This DTC indicates that the stop light switch is remaining on. When the stop light switch remains on during "stop and go" driving, the ECM interprets this as a malfunction of the stop light switch, illuminates the MIL and stores this DTC. The vehicle must STOP (less than 3 km/h (2 mph)) and GO (30 km/h (19 mph) or more) five times for two consecutive driving cycles in order to store this DTC.

WIRING DIAGRAM

B000JQHE01

INSPECTION PROCEDURE

Note


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

  • Perform registration and/or initialization when parts related to the automatic transaxle are replaced Click here.

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Repeat above procedure for 5 times:


    • Stop the vehicle (vehicle speed of 3 km/h (2 mph) or less)

    • Drive the vehicle (vehicle speed of 30 km/h (19 mph) or more)

  2. Turn the engine switch off.

  3. Perform step (1) again.

  4. Check for DTCs again Click here.

PROCEDURE


  1. READ VALUE USING GTS (STOP LIGHT SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Data List / Stop Light SW.

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

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

      Stop light switch status/

      ON or OFF

      • ON: Brake pedal depressed

      • OFF: Brake pedal released

      		 -
      Result
      Result Proceed to
      Data List value is normal A
      Data List value is not normal B

    B

    CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION


    1. Check the stop light switch assembly installation Click here.

      OK
      Stop light switch assembly is installed correctly.

    NG

    SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly Click here.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  4. CHECK TERMINAL VOLTAGE (STP VOLTAGE)


    1. Disconnect the A84 ECM connector.

      B000I04E01
      Text in Illustration
      *a Brake pedal depressed *b Brake pedal released
      *c

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A84-9 (STP) - Body ground Brake pedal released Below 1.5 V
      Brake pedal depressed 7.5 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

    OK

    REPLACE ECM Click here