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 for safety.

      Tech Tips

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

    2. A019LOSE01

      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 and the TRC OFF message will be displayed on the multi-information display for approximately 3 seconds.

      Tech Tips


      • If the skid control ECU stores any DTCs, the ABS warning and slip indicator lights will come on.

      • If any of the indicators remain on or do 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

      Multi-information display (TRC OFF indicator) circuit (Remains on)

      Click here

      Multi-information display (TRC OFF indicator) 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 the intelligent tester)

    Note

    After replacement of the brake actuator assembly and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.

    Tech Tips


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

    • During Test Mode (signal check), the skid control ECU records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes where a malfunction was found.


    1. Procedure to enter Test Mode


      1. Turn the engine switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

      4. Connect the intelligent tester to the DLC3.

      5. Turn the engine switch on (IG).

      6. Turn the intelligent tester on.

      7. Switch the skid control ECU to Test Mode using the intelligent tester. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.

      8. A019KWKE84

        Check that the ABS warning and slip indicator lights come on for several seconds and then blink in Test Mode.

        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.

      9. Check the ABS sensors.

        Tech Tips

        Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check.

    2. Lost Booster Pressure Judgement Check and Master Cylinder Pressure Sensor Zero Point Calibration

      Note

      Perform a check in the lost booster pressure state (vacuum in the booster is depressurized).


      1. Turn the engine switch on (IG).

      2. Check that the brake warning light comes on when depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more. (The lost booster pressure state is judged as normal.)

      3. Start the engine while depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more.

      4. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged as normal.)

      5. 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 judgement 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.

    3. 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 with the master cylinder pressure sensor check below.

    4. Master Cylinder Pressure Sensor Check


      1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, then quickly and continuously depress the brake pedal with a force greater than 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 is illuminated, 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 brake pedal operation above 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.

      2. Check that the ABS warning light goes off.

        Tech Tips


        • The sensor check may not be completed if wheelspin occurs.

        • The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.

        • The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.

      3. Stop the vehicle.

        Note


        • Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.

        • The speed sensor check may not be completed if the speed sensor check is started while turning the steering wheel or spinning the wheels.

        • After the ABS warning light goes off, if the 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).

        • If the sensor check has not been completed, the ABS warning light will blink while driving and the ABS will not operate.

        Tech Tips

        When the sensor check has been completed, the ABS warning light goes off while driving and blinks in the Test Mode pattern while the vehicle is stationary.

    6. End of Sensor Check


      1. A019KWKE84

        If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle is stopped and goes off while the vehicle is driving.

        Note


        • When the acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the sensor check is completed.

        • If the sensor check has not been completed, the ABS warning light will blink while driving and the ABS will not operate.

    7. Read Sensor Check DTCs


      1. Read the DTC(s) by following the intelligent tester 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 intelligent tester.

    8. Sensor Check DTCs

      ABS Sensor
      DTC Code Detection Item Trouble Area
      C1270 Initialization Incomplete
      • ECM

      • CAN communication system (Skid control ECU to ECM)

      • Skid control ECU

      C1271 Low Output Signal of Front Speed Sensor RH
      • Front speed sensor RH

      • Sensor installation

      • Speed sensor rotor

      C1272 Low Output Signal of Front Speed Sensor LH
      • Front speed sensor LH

      • Sensor installation

      • Speed sensor rotor

      C1273 Low Output Signal of Rear Speed Sensor RH
      • Rear speed sensor RH

      • Sensor installation

      • Speed sensor rotor

      C1274 Low Output Signal of Rear Speed Sensor LH
      • Rear speed sensor LH

      • Sensor installation

      • Speed sensor rotor

      C1275 Abnormal Change in Output Signal of Front Speed Sensor RH Speed sensor rotor
      C1276 Abnormal Change in Output Signal of Front Speed Sensor LH Speed sensor rotor
      C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH Speed sensor rotor
      C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH Speed sensor rotor
      C1279 Acceleration Sensor Output Voltage Malfunction
      • Sensor installation

      • Yaw rate and acceleration sensor

      C1281 Master Cylinder Pressure Sensor Output Malfunction
      • Stop light switch

      • Brake pedal load sensing switch

      • Master cylinder pressure sensor

      Tech Tips

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

  3. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When not Using the intelligent tester)

    Note

    After replacement of the skid control ECU and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.

    Tech Tips


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

    • During Test Mode (signal check), the skid control ECU records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes where a malfunction was found.


    1. Procedure to enter Test Mode


      1. Turn the engine switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

      4. A019KN8E50
        Text in Illustration
        *1 DLC3

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

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

      6. A019KWKE84

        Check that the ABS warning and slip indicator lights come on for several seconds and then blink in Test Mode.

        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.

      7. Check the ABS sensors.

        Tech Tips

        Check that the ABS warning light is blinking in the Test Mode blinking pattern before performing the ABS sensor check.

    2. Lost Booster Pressure Judgement Check and Master Cylinder Pressure Sensor Zero Point Calibration

      Note

      Perform a check in the lost booster pressure state (vacuum in the booster is depressurized).


      1. Turn the engine switch on (IG).

      2. Check that the brake warning light comes on when depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more. (The lost booster pressure state is judged as normal.)

      3. Start the engine while depressing the brake pedal with a force greater than 59 N (6 kgf, 13.2 lbf) for 1 second or more.

      4. Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged as normal.)

      5. 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 judgement 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.

    3. 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 with the master cylinder pressure sensor check below.

    4. Master Cylinder Pressure Sensor Check


      1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, then quickly and continuously depress the brake pedal with a force greater than 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 is illuminated, 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 brake pedal operation above 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.

      2. Check that the ABS warning light goes off.

        Tech Tips


        • The sensor check may not be completed if wheelspin occurs.

        • The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.

        • The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.

      3. Stop the vehicle.

        Note


        • Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.

        • The speed sensor check may not be completed if the speed sensor check is started while turning the steering wheel or spinning the wheels.

        • After the ABS warning light goes off, if the 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).

        • If the sensor check has not been completed, the ABS warning light will blink while driving and the ABS will not operate.

        Tech Tips

        When the sensor check has been completed, the ABS warning light goes off while driving and blinks in the Test Mode pattern while the vehicle is stationary.

    6. End of Sensor Check


      1. A019KWKE83

        If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle is stopped and goes off while driving.

        Note


        • When the acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the sensor check is completed.

        • If the sensor check has not been completed, the ABS warning light will blink while driving and the ABS will not operate.

    7. Read Sensor Check DTCs


      1. A019NX5E04
        Text in Illustration
        *1 DLC3

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

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

        A019PEKE05

        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


        • 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).

        Tech Tips


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

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

    8. Sensor Check DTCs

      ABS Sensor
      DTC Code Detection Item Trouble Area
      71 Low Output Signal of Front Speed Sensor RH
      • Front speed sensor RH

      • Sensor installation

      • Speed sensor rotor

      72 Low Output Signal of Front Speed Sensor LH
      • Front speed sensor LH

      • Sensor installation

      • Speed sensor rotor

      73 Low Output Signal of Rear Speed Sensor RH
      • Rear speed sensor RH

      • Sensor installation

      • Speed sensor rotor

      74 Low Output Signal of Rear Speed Sensor LH
      • Rear speed sensor LH

      • Sensor installation

      • Speed sensor rotor

      75 Abnormal Change in Output Signal of Front Speed Sensor RH Speed sensor rotor
      76 Abnormal Change in Output Signal of Front Speed Sensor LH Speed sensor rotor
      77 Abnormal Change in Output Signal of Rear Speed Sensor RH Speed sensor rotor
      78 Abnormal Change in Output Signal of Rear Speed Sensor LH Speed sensor rotor
      79 Acceleration Sensor Output Voltage Malfunction
      • Sensor installation

      • Yaw rate and acceleration sensor

      81 Master Cylinder Pressure Sensor Output Malfunction
      • Stop light switch

      • Brake pedal load sensing switch

      • Master cylinder pressure sensor

      88 Initialization Incomplete
      • ECM

      • CAN communication system (Skid control ECU to ECM)

      • Skid control ECU

      Tech Tips

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