ANTI-LOCK BRAKE SYSTEM TEST MODE PROCEDURE

  1. WARNING LIGHT INITIAL CHECK

    1. Release the parking brake.

      Note:

      • Before releasing the parking brake, use wheel chocks to secure the vehicle.

      • Start Test Mode with the vehicle stopped.

      Tip:

      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 and brake warning lights come on for approximately 3 seconds.

      Tip:

      • If the skid control ECU (brake actuator assembly) stores a DTC, the ABS warning light 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

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

    Tip:

    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. Apply the parking brake.

      4. Check that the shift lever is in neutral.

      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 light comes on for several seconds and then blinks in the Test Mode pattern.

        Tip:

        If the ABS warning light does not blink, inspect the ABS warning light circuit.

      10. Check the ABS sensor.

        Tip:

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

    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.

        Tip:

        • 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.

        Tip:

        • 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.

        Tip:

        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 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.

        Tip:

        See "Sensor Check DTCs".

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

    5. Sensor Check DTCs

      Table 1. ABS Sensor

      DTC No.

      Detection Item

      Trouble Area

      C1271

      Low Output Signal of Front Speed Sensor RH

      • Front speed sensor RH

      • Sensor installation

      • Front speed sensor rotor RH (front axle hub bearing RH)

      C1272

      Low Output Signal of Front Speed Sensor LH

      • Front speed sensor LH

      • Sensor installation

      • Front speed sensor rotor LH (front axle hub bearing LH)

      C1273

      Low Output Signal of Rear Speed Sensor RH

      • Rear speed sensor 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

      • 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 bearing RH)

      C1276

      Abnormal Change in Output Signal of Front Speed Sensor LH

      Front speed sensor rotor LH (front axle hub bearing 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)
      Tip:

      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)

    Tip:

    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. Apply the parking brake.

      4. Check that the shift lever is in neutral.

      5. C166029C33

        *a

        Front view of DLC3

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

        09843-18040

      6. Turn the ignition switch to ON.

      7. Check that the ABS warning light comes on for several seconds and then blinks in the Test Mode pattern.

        Tip:

        If the ABS warning light does not blink, inspect the TS and CG terminal circuit and ABS warning light circuit.

      8. Check the ABS sensor.

        Tip:

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

    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.

        Tip:

        • 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.

        Tip:

        • 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.

        Tip:

        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 checks have 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. C166029C34

      *a

      Front view of DLC3

      Reading Sensor Check DTCs

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

        09843-18040

      2. Count the number of blinks of the ABS warning light.

        Tip:

        • 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.

        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.

        Tip:

        • 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 Test Mode.

        Tip:

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

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

    5. Sensor Check DTCs

      Table 2. ABS Sensor

      DTC No.

      Detection Item

      Trouble Area

      71

      Low Output Signal of Front Speed Sensor RH

      • Front speed sensor RH

      • Sensor installation

      • Front speed sensor rotor RH (front axle hub bearing RH)

      72

      Low Output Signal of Front Speed Sensor LH

      • Front speed sensor LH

      • Sensor installation

      • Front speed sensor rotor LH (front axle hub bearing LH)

      73

      Low Output Signal of Rear Speed Sensor RH

      • Rear speed sensor 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

      • 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 bearing RH)

      76

      Abnormal Change in Output Signal of Front Speed Sensor LH

      Front speed sensor rotor LH (front axle hub bearing 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)
      Tip:

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