VEHICLE STABILITY CONTROL SYSTEM TEST MODE PROCEDURE


  1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK


    1. Release the parking brake.

      Note

      Before releasing the parking brake, move the shift lever to P.

      Tech Tips

      When the parking brake is applied or the brake fluid level is low, the brake warning light comes on.

    2. When the engine switch is turned on (IG), check that the ABS warning, brake warning, VSC OFF indicator and slip indicator lights all come on for approximately 3 seconds.

      Tech Tips


      • 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

  2. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using GTS)

    Tech Tips


    • If the engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs stored during the sensor check will be cleared.

    • During Test Mode (signal check), the skid control ECU (brake actuator assembly) records all DTCs detected in the sensor check. By performing Test Mode (signal check), the DTCs are cleared as the normal condition for each item is confirmed. The remaining DTCs are the DTCs that indicate where an abnormality was found.


    1. Procedure to enter Test Mode


      1. Turn the engine 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 engine switch on (IG).

      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 engine switch on (IG).

      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 DTC C1281 (Master Cylinder Pressure Sensor Output Malfunction) is stored.

    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) or more 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 in reverse for more than 1 second at 3 km/h (2 mph) or more (Reverse signal check).

      2. Check that the ABS warning light goes off.

        Tech Tips

        Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 45 km/h (28 mph) or more.

      3. Drive the vehicle straight-ahead.

        Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds (Forward signal check).

        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.

        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 DTC will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).

      4. 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.

      5. Stop the vehicle.

        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.

        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.

    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. Yaw Rate Sensor Zero Point Check


      1. Check that the shift lever is in P.

      2. Keep the vehicle stationary on a level surface for 5 seconds or more after the engine switch is turned on (IG).

    8. VSC OFF Switch (Combination Switch Assembly) Check


      1. Press the VSC OFF switch (combination switch assembly).

      2. Check that the VSC OFF indicator light comes on.

      3. Press the VSC OFF switch (combination switch assembly) again.

    9. End of Sensor Check


      1. If the sensor checks have completed, the ABS warning light blinks in the Test Mode pattern when the vehicle is stopped and the ABS warning light goes off while the vehicle is being driven.

        Note

        If the sensor checks have not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.

    10. Reading Sensor Check DTCs


      1. Read the DTCs by following the GTS screen.

        Note


        • If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs.

        • If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform Test Mode inspection again.

        Tech Tips

        See "Sensor Check DTCs".

      2. Turn the engine switch off and disconnect the GTS.

    11. Sensor Check DTCs

      Tech Tips

      The DTCs in this table are output only in Test Mode (signal check).

    12. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using SST Check Wire)

      Tech Tips


      • If the engine switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs stored during the sensor check will be cleared.

      • During Test Mode (signal check), the skid control ECU (brake actuator assembly) records all DTCs detected in the sensor check. By performing Test Mode (signal check), the DTCs are cleared as the normal condition for each item is confirmed. The remaining DTCs are the DTCs that indicate where an abnormality was found.


      1. Procedure to enter Test Mode


        1. Turn the engine 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. B0076VXC64
    13. *a Front view of DLC3

Using SST, connect terminals TS and CG of the DLC3.

SST
09843-18040
  • Turn the engine switch on (IG).

  • 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 TS and CG terminal circuit and ABS warning and slip indicator light circuits.

  • 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.

  • 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.

  • 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 engine switch on (IG).

    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 DTC C1281 (Master Cylinder Pressure Sensor Output Malfunction) is stored.

  • 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) or more 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.

  • Speed Sensor Check


    1. Drive the vehicle in reverse for more than 1 second at 3 km/h (2 mph) or more (Reverse signal check).

    2. Check that the ABS warning light goes off.

      Tech Tips

      Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 45 km/h (28 mph) or more.

    3. Drive the vehicle straight-ahead.

      Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds (Forward signal check).

      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 DTC 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.

    4. 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.

    5. 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.

  • 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.

  • Yaw Rate Sensor Zero Point Check


    1. Check that the shift lever is in P.

    2. Keep the vehicle stationary on a level surface for 5 seconds or more after the engine switch is turned on (IG).

  • VSC OFF Switch (Combination Switch Assembly) Check


    1. Press the VSC OFF switch (combination switch assembly).

    2. Check that the VSC OFF indicator light comes on.

    3. Press the VSC OFF switch (combination switch assembly) again.

  • End of Sensor Check


    1. If the sensor checks have completed, the ABS warning light blinks in the Test Mode pattern when the vehicle is stopped and the ABS warning light goes off while the vehicle is being driven.

      Note

      If the sensor checks have not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.

  • A01R6URC65
    *a Front view of DLC3

    Reading Sensor Check DTCs


    1. Using SST, connect terminals TC and CG of the DLC3.

      SST
      09843-18040
    2. Count the number of blinks of the ABS warning and slip indicator lights.

      Note


      • If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs.

      • If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform Test Mode inspection again.

      Tech Tips


      • How to read DTCs:

        Diagnostic trouble codes are represented by the number of blinks of a warning light. For example, code 21 would be shown by 2 blinks, a pause of 1.5 seconds, and then 1 blink.

      • If one code is detected:

        The light repeats the same code after a pause of 4 seconds.

      • If multiple codes are detected:

        The light outputs one code after another with a 2.5-second pause between each code.

        When all codes have been output, there is a 4-second pause and then the light begins to output the codes again.

      • If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.

      • See "Sensor Check DTCs".

    3. After performing the check, disconnect SST from terminals TS and CG, and TC and CG of the DLC3, and turn the engine switch off.

    4. Turn the engine switch on (IG) to cancel Test Mode.

      Tech Tips


      • If the engine switch is not turned off and back on (IG) after SST is removed from the DLC3, the previous Test Mode will continue.

      • If the engine switch is turned back on (IG) with terminals TS and CG connected, the previous Test Mode will continue.

  • Sensor Check DTCs

    Tech Tips

    The DTCs in this table are output only in Test Mode (signal check).