VEHICLE STABILITY CONTROL SYSTEM TEST MODE PROCEDURE

WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

When the ignition switch is turned to ON, check that the ABS warning, brake warning, VSC OFF indicator, slip indicator and downhill assist control indicator (for AWD) lights all come on for approximately 3 seconds.

Tech Tips

When the brake fluid level is low, the brake warning light comes on.
If the skid control ECU (brake actuator assembly) stores a DTC, the ABS warning and slip indicator lights will come on.
If any of the indicators remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

Trouble Area	See Procedure
ABS warning light circuit (Remains on)	Click here
ABS warning light circuit (Does not come on)	Click here
Brake warning light circuit (Remains on)	Click here
Brake warning light circuit (Does not come on)	Click here
VSC OFF indicator light circuit (Remains on)	Click here
VSC OFF indicator light circuit (Does not come on)	Click here
Slip indicator light circuit (Remains on)	Click here
Slip indicator light circuit (Does not come on)	Click here
Downhill assist control indicator light circuit (Remains on)*	Click here
Downhill assist control indicator light circuit (Does not come on)*	Click here

*: for AWD

Tech Tips
- VSC does not operate in Test Mode (signal check), regardless of whether the sensor check is normal or abnormal.
- When a malfunction occurs in an ABS system sensor, the ABS warning light illuminates.
- When a malfunction occurs in a VSC system sensor, the slip indicator light illuminates.
SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using GTS)
1. Procedure to enter Test Mode
  1. Turn the ignition switch off.
  2. Check that the steering wheel is centered.
  3. Apply the parking brake.
  4. Check that the shift lever is in P.
  5. Connect the GTS to the DLC3.
  6. Turn the ignition switch to ON.
  7. Turn the GTS on.
  8. Switch the skid control ECU (brake actuator assembly) to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.
    
    Chassis > ABS/VSC/TRC > Utility
    
    Tester Display
    
    Signal Check
  9. Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.
    
    Tech Tips
    
    If the ABS warning and slip indicator lights do not blink, inspect the ABS warning and slip indicator light circuits.
  10. Check the ABS sensors.
    
    Tech Tips
    
    Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks.
2. Acceleration Sensor Check
  1. Keep the vehicle stationary on a level surface for 1 second or more.
    
    Tech Tips
    
    The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below.
3. Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration
  1. Depress the brake pedal several times to release vacuum from the brake booster assembly with the engine stopped.
  2. Turn the ignition switch to ON.
  3. Check that the brake warning light comes on when depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged to be normal.)
  4. Start the engine while depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more.
  5. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged to be normal.)
  6. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
    Note
    - If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
    - If the lost booster pressure judgment check results are not normal, then the master cylinder pressure sensor check cannot be performed.
    - If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.
    Tech Tips
    
    If the lost booster pressure state is not judged to be normal, the brake warning light comes on and Test Mode (signal check) inspection item (Output Master Cylinder Pressure Sensor) is displayed.
4. Master Cylinder Pressure Sensor Check
  1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) for 1 second.
  2. Check that the ABS warning light stays on for 3 seconds.
    Tech Tips
    - Confirm that the ABS warning light comes on.
    - While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more.
    - The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
5. Speed Sensor Check
  1. Drive the vehicle straight-ahead.
    
    Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds.
    Note
    - The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.
    - After the ABS warning light goes off, if vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
    Tech Tips
    - The sensor check may not complete if wheelspin occurs.
    - The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
  2. Check that the ABS warning light goes off.
    Tech Tips
    - The ABS warning light goes off when the sensor check has completed.
    - The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.
  3. Stop the vehicle.
    
    Note
    
    If the sensor check has not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.
    
    Tech Tips
    
    When the sensor check has completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped.
6. VSC Sensor Check
  
  Tech Tips
  
  Check that the slip indicator light is blinking in the Test Mode pattern before performing the following VSC sensor check.
7. VSC OFF Switch Check
  1. Press the VSC OFF switch.
  2. Check that the VSC OFF indicator light comes on.
  3. Press the VSC OFF switch again.
8. Downhill Assist Control Switch Check (for AWD)
  1. Press the downhill assist control switch.
  2. Check that the downhill assist control indicator light blinks.
  3. Press the downhill assist control switch again.
9. End of Sensor Check
  1. If the sensor check is completed, the ABS warning light and slip indicator light blink (Test Mode (signal check)) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.
    Note
    - When Test Mode (signal check) is started with the GTS and all items display complete, the sensor check ends.
    - If the sensor check is not complete, the ABS warning light blinks when the vehicle is in motion and the ABS does not operate.
10. End of Test Mode (Signal Check)
  1. End Test Mode (signal check) using the GTS
    1. Turn the ignition switch off and enter normal mode.
    2. Remove the GTS.
11. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using SST Check Wire)
  Tech Tips
  - VSC does not operate in Test Mode (signal check), regardless of whether the sensor check is normal or abnormal.
  - When a malfunction occurs in an ABS system sensor, the ABS warning light illuminates.
  - When a malfunction occurs in a VSC system sensor, the slip indicator light illuminates.
  1. Procedure to enter Test Mode
    1. Turn the ignition switch off.
    2. Check that the steering wheel is centered.
    3. Apply the parking brake.
    4. Check that the shift lever is in P.
  *a Front view of DLC3