K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P070312; Brake Switch "B" Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback [11/2022

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.

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

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

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

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for 2 minutes or more.
Turn the engine switch on (IG) and turn the Techstream on.
Start the engine.
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.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P070312.

Check the DTC judgment result.

Techstream 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 Techstream contacting the pedals, shift lever or steering wheel.
Driving the vehicle with the cable of the Techstream contacting these areas could impede vehicle control, resulting 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.
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Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

(d) Enter the following menus: Powertrain / Transmission / Data List / Stop Light SW.

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

Powertrain > Transmission > Data List

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.