Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Brake Switch "B" Circuit Short to Battery (P070312)

DESCRIPTION

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

When the brake pedal is depressed, the stop light switch assembly sends a signal to the TCM. Then the TCM 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 ignition switch is to ON.
  • The auxiliary 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 assembly circuit
  • Stop light switch assembly
  • TCM

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 "stop and go" driving, the TCM interprets this as a malfunction of the stop light switch assembly, 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.

MONITOR STRATEGY

Related DTCs

P0724: Stop light switch/Verify switch input

Required sensors/Components

Stop light switch assembly

Frequency of operation

Continuous

Duration

GO and STOP 5 times

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The stop light switch remains on during GO and STOP driving 5 times.

GO and STOP are defined as follows:

The monitor will run whenever the following DTCs are not stored

None

GO (Vehicle speed is 30 km/h (18.65 mph) or more)

Once

STOP (Vehicle speed is less than 3 km/h (1.86 mph))

Once

Auxiliary battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Stop light switch

ON

CONFIRMATION DRIVING PATTERN

CAUTION:

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

HINT:

  • 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.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

    Click here

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Turn the ignition switch to ON and turn the GTS on.
  4. Start the engine.
  5. Repeat the following procedure 5 times [*1]:
    • Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to less than 3 km/h (2 mph).

      HINT:

      [*1]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  6. Stop the vehicle.
  7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  8. Input the DTC: P070312.
  9. 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

    HINT:

    • 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 normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

  • Strictly observe posted speed limits, traffic laws and road conditions.
  • Do not drive the vehicle with the cable of the GTS contacting the pedals, shift lever or steering wheel.
  • Driving the vehicle with the cable of the GTS contacting these areas could impede vehicle control, resulting in a serious accident.
  • Do not operate the GTS while driving the vehicle.
  • Operating the GTS while driving the vehicle will prevent you from paying sufficient attention to vehicle surroundings, and could result in a serious accident.

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here

  • Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

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

PROCEDURE

1.

READ VALUE USING GTS (STOP LIGHT SW)

(a) Enter the following menus:

(b) According to the display on the GTS, read the Data List while the vehicle is being driven.

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light SW

Stop light switch assembly status

OFF or ON

  • OFF: Brake pedal released
  • ON: Brake pedal depressed

-

Powertrain > Transmission > Data List

Tester Display

Stop Light SW

OK:

On the GTS screen, ON or OFF is displayed accordingly.

NOTICE:

In the table above, the conditions listed under "Normal Condition" are reference conditions. Do not depend solely on these reference conditions when deciding whether a part is faulty or not.

OK

CHECK FOR INTERMITTENT PROBLEMS

Click here

Click here

NG

2.

CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

Click here

OK:

Stop light switch assembly is installed correctly.

NG

SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY

OK

3.

INSPECT STOP LIGHT SWITCH ASSEMBLY

Click here

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

4.

CHECK TERMINAL VOLTAGE (STP VOLTAGE)

(a) Disconnect the TCM connector.

*a

Brake pedal depressed

*b

Brake pedal released

*c

Front view of wire harness connector

(to TCM)

-

-

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C80-43 (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

OK

5.

REPLACE TCM

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

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