- Open or short in speed sensor
- Open or short in sensor system wire harness
- Defective connector contact or increased terminal resistance
- Speed sensor installation defect
- Front speed sensor rotor RH (front axle hub sub-assembly RH) malfunction
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM10000000260QY |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): TEST MODE PROCEDURE; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 - ] | ||
TEST MODE PROCEDURE
ACTIVATE DEALER MODE (SIGNAL CHECK)
NOTICE:
- After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
- After replacing or removing and installing a speed sensor rotor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
HINT:
- Signals related to the electronically controlled brake system can be inspected by performing a Dealer Mode (Signal Check) inspection. During the inspection, the display of items determined normal by the skid control ECU (brake actuator assembly) changes from incomplete to complete.
- During Dealer Mode (Signal Check), the VSC system does not operate regardless of whether the system is normal or a malfunction is detected.
- If a sensor is malfunctioning, ABS does not operate and the ABS warning and slip indicator lights illuminate.
(a) Procedure to enter Dealer Mode (Signal Check).
(1) Turn the ignition switch off.
(2) Apply the parking brake.
(3) Check that the shift lever is in neutral.
(4) Connect the GTS to the DLC3.
(5) Turn the ignition switch to ON.
(6) Check that the steering wheel is centered.
(7) Turn the GTS on.
(8) Enter the following menus: Chassis / Brake / Utility / Signal Check.
Chassis > Brake/EPB > Utility
|
Tester Display |
|---|
|
Signal Check |
(b) Confirm the system has entered Dealer Mode (Signal Check)
(1) Confirm that the ABS warning light and slip indicator light indicate the Dealer Mode pattern (blinking at 0.25 second intervals).
HINT:
- If the ABS warning light or slip indicator light remains illuminated or does not illuminate when Dealer Mode (Signal Check) is entered, a component or wire harness may be malfunctioning.
- When entering Dealer Mode (Signal Check), if the parking brake is engaged, the parking brake indicator light (red) will illuminate, and if the parking brake is not engaged, the parking brake indicator light (red) will blink in the Dealer Mode pattern (blinking at 0.25 seconds intervals).
(c) Master Cylinder Pressure Sensor Check
(1) With the vehicle stopped, release the brake pedal for 1 second or more and check that the value of Dealer Mode (Signal Check) Inspection Item Output Master Cylinder Pressure Sensor changes from incomplete to complete.
HINT:
- The status of the ABS warning light and slip indicator light will not change.
- If the master cylinder pressure sensor is normal and the above step is performed when in Dealer Mode (Signal Check), the master cylinder pressure sensor check will complete normally.
(d) Speed Sensor Check
NOTICE:
Before performing the speed sensor signal check, complete the master cylinder pressure sensor check.
(1) Start the engine.
(2) Drive the vehicle straight-ahead.
Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds.
(3) Accelerating to a vehicle speed of 3 km/h (2 mph) or more, drive the vehicle in reverse for 1 second or more.
(4) Check that the ABS warning light goes off.
NOTICE:
- If the sensor check does not complete successfully or a malfunctioning sensor is detected, the ABS warning light indicates the Dealer Mode pattern (blinking at 0.25 second intervals) and the ABS system will not operate.
- If the vehicle is driven at 80 km/h (50 mph) or more after the ABS warning light turns off, the speed sensor check will be performed again. In this situation, the ABS warning light will start blinking again.
- The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.
(5) Stop the vehicle.
(e) End of Sensor Check
(1) If the sensor check completes successfully, the ABS warning light turns off when the vehicle is being driven, and indicates the Dealer Mode pattern (blinking at 0.25 second intervals) when the vehicle is stopped.
NOTICE:
- When Dealer Mode (Signal Check) is started with the GTS and all items display complete, the sensor check ends.
- If the sensor checks have not completed, the ABS warning light will remain blinking while the vehicle is being driven, and the ABS will not operate.
- If a DTC is detected in Dealer Mode (Signal Check), the ABS warning light or slip indicator light illuminates.
- If any DTCs are output or if Dealer Mode (Signal Check) items do not complete even after repeated attempts, repair or replace the malfunctioning part.
(f) End of Dealer Mode (Signal Check)
(1) Turn the ignition switch off and enter normal mode.
(2) Disconnect the GTS.
(g) Dealer Mode (Signal Check) Inspection Item Chart
|
Item Name |
Range |
Judgment Description |
Trouble Area |
|
Output Signal of Front Speed Sensor RH |
Incomplete/complete |
Check for foreign matter, evaluate the gap between the sensor and rotor |
|
|
Output Signal of Front Speed Sensor LH |
Incomplete/complete |
Check for foreign matter, evaluate the gap between the sensor and rotor |
|
|
Output Signal of Rear Speed Sensor RH |
Incomplete/complete |
Check for foreign matter, evaluate the gap between the sensor and rotor |
|
|
Output Signal of Rear Speed Sensor LH |
Incomplete/complete |
Check for foreign matter, evaluate the gap between the sensor and rotor |
|
|
Change in Output Signal of Front Speed Sensor RH |
Incomplete/complete |
Check the stability of the sensor input waveform |
|
|
Change in Output Signal of Front Speed Sensor LH |
Incomplete/complete |
Check the stability of the sensor input waveform |
|
|
Change in Output Signal of Rear Speed Sensor RH |
Incomplete/complete |
Check the stability of the sensor input waveform |
|
|
Change in Output Signal of Rear Speed Sensor LH |
Incomplete/complete |
Check the stability of the sensor input waveform |
|
|
Output in Master Cylinder Pressure Sensor |
Incomplete/complete |
Evaluate the master cylinder pressure sensor zero point voltage |
|
|
|