VEHICLE STABILITY CONTROL SYSTEM TEST MODE PROCEDURE


  1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK


    1. When the ignition is turned to ON, check that the ABS warning light, brake system warning light (red indicator), slip indicator light and VSC OFF indicator light come on for approximately 3 seconds.

      Tech Tips


      • When the brake fluid level is low, the brake system warning light (red indicator) 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 system warning light (red indicator) circuit (Remains on)

      Click here

      Brake system warning light (red 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 GTS)

    Note

    Perform Test Mode with the vehicle stopped.

    Tech Tips

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


    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 neutral.

      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 (brake actuator assembly) to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.

      8. 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.

      9. 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. 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.

        Tech Tips


        • The speed sensor check may not complete if wheelspin occurs.

        • The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel.

        Note

        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).

      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.

        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.

    3. 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.

    4. 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 ignition switch off and disconnect the GTS.

    5. Sensor Check DTCs

      ABS Sensor
      DTC No. Detection Item Trouble Areas
      C1271 Low Output Signal of Front Speed Sensor RH

      • Front speed sensor RH

      • Sensor installation

      • Front speed sensor rotor RH (front axle hub sub-assembly RH)
      C1272 Low Output Signal of Front Speed Sensor LH

      • Front speed sensor LH

      • Sensor installation

      • Front speed sensor rotor LH (front axle hub sub-assembly LH)
      C1273 Low Output Signal of Rear Speed Sensor RH

      • Rear speed sensor RH (rear axle hub and bearing assembly RH)

      • Sensor installation

      • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
      C1274 Low Output Signal of Rear Speed Sensor LH

      • Rear speed sensor LH (rear axle hub and bearing assembly LH)

      • Sensor installation

      • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
      C1275 Abnormal Change in Output Signal of Front Speed Sensor RH Front speed sensor rotor RH (front axle hub sub-assembly RH)
      C1276 Abnormal Change in Output Signal of Front Speed Sensor LH Front speed sensor rotor LH (front axle hub sub-assembly LH)
      C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
      C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)

      Tech Tips

      The codes in this table are output only in Test Mode (Signal Check).

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

    Note

    Perform Test Mode with the vehicle stopped.

    Tech Tips

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


    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 neutral.

      4. A004SVSE76
        Text in Illustration
        *a 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. 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.

      7. 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. 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.

        Tech Tips


        • The speed sensor check may not complete if wheelspin occurs.

        • The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel.

        Note

        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).

      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.

        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.

    3. 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.

    4. Reading Sensor Check DTCs


      1. A004SVSE78
        Text in Illustration
        *a Front view of DLC3

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

        SST
        09843-18040

        Tech Tips


        • When the system is operating correctly, each light will blink continuously in a pattern of 0.25 seconds on, and then 0.25 seconds off.

        • When one DTC is output, each light will output the same code at 4 second intervals (for example, code 21 would be output as 2 flashes, a 1.5 second pause, and then 1 flash).

        • When 2 or more DTCs are output, each light will output a different code at 2.5 second intervals, and when all codes have been output, there will be a 4 second pause and the sequence will repeat.

        • When multiple codes are stored, they are output in order starting with the lowest DTC number.

        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 SST from the DLC3.

        Tech Tips


        • Test Mode (Signal Check) is continued if 12 (TS) and 4 (CG) are disconnected while the ignition switch is to ON.

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

    5. Sensor Check DTCs

      ABS Sensor
      DTC No. Detection Item Trouble Areas
      71 Low Output Signal of Front Speed Sensor RH

      • Front speed sensor RH

      • Sensor installation

      • Front speed sensor rotor RH (front axle hub sub-assembly RH)
      72 Low Output Signal of Front Speed Sensor LH

      • Front speed sensor LH

      • Sensor installation

      • Front speed sensor rotor LH (front axle hub sub-assembly LH)
      73 Low Output Signal of Rear Speed Sensor RH

      • Rear speed sensor RH (rear axle hub and bearing assembly RH)

      • Sensor installation

      • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
      74 Low Output Signal of Rear Speed Sensor LH

      • Rear speed sensor LH (rear axle hub and bearing assembly LH)

      • Sensor installation

      • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
      75 Abnormal Change in Output Signal of Front Speed Sensor RH Front speed sensor rotor RH (front axle hub sub-assembly RH)
      76 Abnormal Change in Output Signal of Front Speed Sensor LH Front speed sensor rotor LH (front axle hub sub-assembly LH)
      77 Abnormal Change in Output Signal of Rear Speed Sensor RH Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
      78 Abnormal Change in Output Signal of Rear Speed Sensor LH Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)

      Tech Tips

      The codes in this table are output only in Test Mode (Signal Check).