ELECTRONICALLY CONTROLLED BRAKE SYSTEM TEST MODE PROCEDURE


  1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK


    1. When the power switch is turned on (IG), check that the VSC OFF indicator light comes on for approximately 3 seconds, and ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction), slip indicator, brake hold standby indicator and brake hold operated indicator lights remain on until the power switch is turned on (READY).

      Tech Tips


      • If the skid control ECU assembly stores any DTCs, the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights will come on. When the brake hold switch is turned on, the brake hold operated indicator light blinks.

      • 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 / red (malfunction) circuit (Remains on)

      Click here

      Brake warning light / red (malfunction) circuit (Does not come on)

      Click here

      Brake warning light / yellow (minor malfunction) circuit (Remains on)

      Click here

      Brake warning light / yellow (minor malfunction) 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

      Brake hold standby indicator light circuit

      Click here

      Brake hold operated indicator light circuit

      Click here

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

    Note

    Before performing the master cylinder pressure sensor check or yaw rate sensor zero point voltage check, perform linear valve offset learning.

    Tech Tips


    • If the power 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 assembly 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 an abnormality was found.


    1. Procedure to enter the Test Mode


      1. Turn the power switch off.

      2. Apply the parking brake.

      3. Check that the steering wheel is centered.

      4. Check that the shift lever is in P.

      5. Connect the GTS to the DLC3.

      6. Turn the power switch on (IG).

      7. Turn the GTS on.

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

      9. Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in Test Mode.

        Tech Tips

        If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning, brake warning / yellow (minor malfunction) and slip indicator light circuits.

      10. 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. 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.

    3. Master Cylinder Pressure Sensor Check

      Note

      Before performing the master cylinder pressure sensor check, perform linear valve offset learning.


      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 greater than 98 N (10 kgf, 22 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 stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.

        • The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.

    4. Speed Sensor Check

      Note

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


      1. Drive the vehicle straight-ahead.

        Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.

        Tech Tips


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

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

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

      3. 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.

        • If the ABS warning light turns on, check the speed sensor according to the output DTCs.

      4. 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.

        • After the ABS warning light goes off, if 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.

    5. VSC OFF Switch Check


      1. Press the VSC OFF switch.

      2. Check that "TRC OFF" is displayed on the multi-information display in the combination meter assembly.

      3. Press the VSC OFF switch again.

      4. Check that "TRC OFF" disappears from the multi-information display in the combination meter assembly.

    6. Brake Hold Switch Check

      Tech Tips

      Perform the check with the system in a normal condition.


      1. Make sure the following conditions are met:


        • The driver side door is closed.

        • The driver side seat belt is fastened.

        • The engine hood is closed.

        • The trunk is closed.

      2. Press the brake hold switch.

      3. Check that the brake hold standby indicator light is illuminated.

      4. Press the brake hold switch again.

      5. Check that the brake hold standby indicator light turns off.

    7. Skid Control Buzzer Assembly Check


      1. Switch the skid control ECU assembly to Active Test using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      2. Select the Active Test on the GTS. Enter the following menus: Chassis / ABS/VSC/ TRC / Active Test / Buzzer.

      3. Perform the Active Test.

      4. After performing the Active Test, check that the skid control buzzer assembly sounds.

    8. End of Sensor Check


      1. 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.

    9. 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 malfunction 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 malfunction, clear the DTCs, and perform the Test Mode inspection again.

        Tech Tips

        See "Sensor Check DTCs".

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

        Tech Tips

        Immediately after turning the power switch on (IG) once again, the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights will blink twice (for approximately 0.65 seconds). However, this is not a malfunction.

    10. 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

      • Front speed sensor RH

      • Speed sensor rotor
      C1276 Abnormal Change in Output Signal of Front Speed Sensor LH

      • Front speed sensor LH

      • Speed sensor rotor
      C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH

      • Rear speed sensor RH

      • Speed sensor rotor
      C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH

      • Rear speed sensor LH

      • Speed sensor rotor
      C1279 Acceleration Sensor Output Voltage Malfunction

      • Sensor installation

      • Acceleration sensor (yaw rate sensor)
      C1281 Master Cylinder Pressure Sensor Output Malfunction

      • Stop light switch assembly

      • Master cylinder pressure sensor
      Electronically Controlled Brake System Sensor
      DTC Code Detection Item Trouble Area
      C1346 Stroke Sensor Zero Point Learning Malfunction

      • Brake pedal stroke sensor assembly

      • Brake pedal stroke sensor circuit

      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)

    Note

    Before performing the master cylinder pressure sensor check or yaw rate sensor zero point voltage check, perform linear valve offset learning.

    Tech Tips


    • If the power 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 assembly 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 an abnormality was found.


    1. Procedure to enter Test Mode


      1. Turn the power switch off.

      2. Apply the parking brake.

      3. Check that the steering wheel is centered.

      4. Check that the shift lever is in P.

      5. A01FUBME40
        Text in Illustration
        *a Front view of DLC3

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

        SST
        09843-18040

      6. Turn the power switch on (IG).

      7. Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in Test Mode.

        Tech Tips

        If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning, brake warning / yellow (minor malfunction) and slip indicator light circuits.

      8. 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. 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.

    3. Master Cylinder Pressure Sensor Check

      Note

      Before performing the master cylinder pressure sensor check, perform linear valve offset learning.


      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 greater than 98 N (10 kgf, 22 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 stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.

        • The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.

    4. Speed Sensor Check

      Note

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


      1. Drive the vehicle straight-ahead.

        Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.

        Tech Tips


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

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

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

      3. 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.

        • If the ABS warning light turns on, check the speed sensor according to the output DTCs.

      4. 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.

        • After the ABS warning light goes off, if 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.

    5. VSC OFF Switch Check


      1. Press the VSC OFF switch.

      2. Check that "TRC OFF" is displayed on the multi-information display in the combination meter assembly.

      3. Press the VSC OFF switch again.

      4. Check that "TRC OFF" disappears from the multi-information display in the combination meter assembly.

    6. Brake Hold Switch Check

      Tech Tips

      Perform the check with the system in a normal condition.


      1. Make sure the following conditions are met:


        • The driver side door is closed.

        • The driver side seat belt is fastened.

        • The engine hood is closed.

        • The trunk is closed.

      2. Press the brake hold switch.

      3. Check that the brake hold standby indicator light is illuminated.

      4. Press the brake hold switch again.

      5. Check that the brake hold standby indicator light turns off.

    7. End of Sensor Check


      1. 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.

    8. Read Sensor Check DTCs


      1. A01FUBME41
        Text in Illustration
        *a 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, brake warning / yellow (minor malfunction) and slip indicator lights.

        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.

        Note


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

      4. Turn the power switch on (IG).

        Tech Tips


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

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

        • Immediately after turning the power switch on (IG), the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights will blink twice (for approximately 0.65 seconds). However, this is not a malfunction.

    9. 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

      • Front speed sensor RH

      • Speed sensor rotor
      76 Abnormal Change in Output Signal of Front Speed Sensor LH

      • Front speed sensor LH

      • Speed sensor rotor
      77 Abnormal Change in Output Signal of Rear Speed Sensor RH

      • Rear speed sensor RH

      • Speed sensor rotor
      78 Abnormal Change in Output Signal of Rear Speed Sensor LH

      • Rear speed sensor LH

      • Speed sensor rotor
      79 Acceleration Sensor Output Voltage Malfunction

      • Sensor installation

      • Acceleration sensor (yaw rate sensor)
      81 Master Cylinder Pressure Sensor Output Malfunction

      • Stop light switch assembly

      • Master cylinder pressure sensor
      Electronically Controlled Brake System Sensor
      DTC Code Detection Item Trouble Area
      71 Stroke Sensor Zero Point Learning Malfunction

      • Brake pedal stroke sensor assembly

      • Brake pedal stroke sensor circuit

      Tech Tips

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