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. When the ignition switch is turned to ON, check that the ABS warning, brake warning, TRC OFF indicator, VSC OFF indicator and slip indicator lights all come on 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 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

      TRC OFF indicator light circuit (Remains on)

      Click here

      TRC OFF indicator 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 the GTS)

    Tech Tips

    DTCs are stored if any malfunctions are detected during each sensor check.


    1. Procedure to enter Test Mode


      1. Turn the ignition switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

      4. Connect the GTS to the DLC3.

      5. Turn the ignition switch to ON.

      6. Turn the GTS on.

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

      8. A01EKE6E84

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

        Tech Tips


        • The TRC OFF indicator light remains on during Test Mode because TRC is prohibited.

        • 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 Judgment Check

      Note

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


      1. Turn the ignition switch to ON.

      2. Check that the brake warning light comes on when depressing the brake pedal with a force of 65.5 N (6.7 kgf, 15.0 lbf) or more for 1 second or more. (The lost booster pressure state is judged to be normal.)

      3. Start the engine while depressing the brake pedal with a force of 65.5 N (6.7 kgf, 15.0 lbf) or more 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 to be normal.)

        Note


        • If the lost booster pressure judgment check is not completed normally, the master cylinder pressure sensor check is not judged.

        • If a recheck is performed after the engine has started, end the Test Mode, enter Test Mode again, and release the vacuum in the booster by pumping the brake pedal prior to the recheck.

        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 recorded.

    3. 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 wheel spin occurs.

        • The ABS warning light goes off when the sensor check has been completed.

        • The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.

      3. Stop the vehicle.

        Note


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

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

        • 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).

        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 stationary.

    4. VSC OFF Switch Check


      1. Check that the TRC OFF indicator light comes on and VSC OFF indicator light goes off.

      2. Press the VSC OFF switch.

      3. Check that the TRC OFF indicator light goes off.

      4. Press and hold the VSC OFF switch for 3 seconds or more.

      5. Check that the TRC OFF indicator and VSC OFF indicator lights come on.

    5. End of Sensor Check


      1. A01EKE6E84

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

        Note

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

    6. Read Sensor Check DTCs


      1. Read the DTC(s) 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 ignition switch off and disconnect the GTS.

    7. Sensor Check DTCs

      ABS Sensor
      DTC Code Detection Item Trouble Area
      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
      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 GTS)

    Tech Tips

    DTCs are stored if any malfunctions are detected during each sensor check.


    1. Procedure to enter Test Mode


      1. Turn the ignition switch off.

      2. Check that the steering wheel is centered.

      3. Check that the shift lever is in P.

      4. A01ELGJE13
        Text in Illustration
        *1 Front view of DLC3

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

        SST
        09843-18040

      5. Turn the ignition switch to ON.

      6. A01EKE6E84

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

        Tech Tips


        • The TRC OFF indicator light remains on during Test Mode because TRC is prohibited.

        • 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 Judgment Check

      Note

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


      1. Turn the ignition switch to ON.

      2. Check that the brake warning light comes on when depressing the brake pedal with a force of 65.5 N (6.7 kgf, 15.0 lbf) or more for 1 second or more. (The lost booster pressure state is judged to be normal.)

      3. Start the engine while depressing the brake pedal with a force of 65.5 N (6.7 kgf, 15.0 lbf) or more 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 to be normal.)

        Note


        • If the lost booster pressure judgment check is not completed normally, the master cylinder pressure sensor check is not judged.

        • If a recheck is performed after the engine has started, end the Test Mode, enter Test Mode again, and release the vacuum in the booster by pumping the brake pedal prior to the recheck.

        Tech Tips

        If the lost booster pressure state is not judged to be normal, the brake warning light comes on and Test Mode DTC 81 (Master Cylinder Pressure Sensor Output Malfunction) is recorded.

    3. 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 wheel spin occurs.

        • The ABS warning light goes off when the sensor check has been completed.

        • The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.

      3. Stop the vehicle.

        Note


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

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

        • 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).

        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 stationary.

    4. VSC OFF Switch Check


      1. Check that the TRC OFF indicator light comes on and VSC OFF indicator light goes off.

      2. Press the VSC OFF switch.

      3. Check that the TRC OFF indicator light goes off.

      4. Press and hold the VSC OFF switch for 3 seconds or more.

      5. Check that the TRC OFF indicator and VSC OFF indicator lights come on.

    5. End of Sensor Check


      1. A01EKE6E84

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

        Note

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

    6. Read Sensor Check DTCs


      1. A01ELGJE14
        Text in Illustration
        *1 Front view of DLC3

        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.

        A01EJ55E03

        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 ignition switch off.

      4. Turn the ignition switch to ON to cancel the Test Mode.

        Tech Tips


        • If the ignition switch is not turned to ON after SST is removed from the DLC3, the previous Test Mode will continue.

        • If the ignition switch is turned to ON with terminals TS and CG shorted, the previous Test Mode will continue.

    7. 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
      81 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).