AUTOMATIC TRANSMISSION SYSTEM(for 2GR-FKS), 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, the stop light switch assembly sends a signal to the ECM. The ECM then cancels the operation of the lock-up clutch while braking is in progress.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P070312 Brake Switch "B" Circuit Short to Battery

All of the following conditions are met (2-trip detection logic):


  • The engine switch is on (IG).

  • The battery voltage is 8 V or more.

  • The stop light switch assembly remains on while 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.

  • Short in stop light switch signal circuit

  • Stop light switch assembly

  • ECM

 Comes on DTC stored SAE Code: P0724

MONITOR DESCRIPTION

This DTC indicates that the stop light switch assembly is remaining on. When the stop light switch assembly remains on during GO and STOP driving, the ECM interprets this as a malfunction of the stop light switch circuit, then illuminates the MIL and stores this DTC. The vehicle must GO (30 km/h (19 mph) or more) and STOP (less than 3 km/h (2 mph)) 5 times for 2 driving cycles in order for the DTC to be output.

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Tech Tips

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the engine switch off and wait for 2 minutes or more.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Start the engine.

  7. Repeat the following procedure 5 times:


    • Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (2 mph) or less.

  8. Stop the vehicle.

  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

  10. Input the DTC: P070312.

  11. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

B0074GWE21
*a ENG-B
*b STOP
*c Stop Light Switch Assembly
*d Battery

CAUTION / NOTICE / HINT

Note


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

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

    Click here

PROCEDURE


  1. READ VALUE USING GTS (STOP LIGHT SW)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

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


      Powertrain > Transmission > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch assembly status ON or OFF

      • ON: Brake pedal depressed

      • OFF: Brake pedal released

      		 -

      Powertrain > Transmission > Data List
      Tester Display
      Stop Light SW
      Result
      Result Proceed to
      Data List value is normal A
      Data List value is not normal B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

  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.
      Result
      Proceed to
      OK
      NG

    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

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK TERMINAL VOLTAGE (STP VOLTAGE)


    1. Disconnect the A96 ECM connector.

      B00746CC30
      *a Brake pedal depressed *b Brake pedal released
      *c

      Front view of wire harness connector

      (to ECM)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A96-27 (STP) - Body ground Brake pedal released Below 1.5 V
      Brake pedal depressed 7.5 to 14 V

      Tech Tips

      If there is a short in the STP terminal circuit, there may be a malfunction in the circuit of a connected ECU.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here