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Home >> Toyota >> 2019 >> Corolla XLE >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Stability Control System - Diagnostics - Introduction (1 Of 2) (Model Code: ZRE172) >> Vehicle Stability Control System >> Test Mode Procedure [08/2015 - 08/2016] >> Test Mode Procedure [08/2015 - 08/2016]
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Test Mode Procedure [08/2015 - 08/2016]

  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 continuously variable transaxle or automatic transaxle) or use wheel chocks to secure the vehicle (for manual transaxle).

      HINT: 

      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, TRAC OFF indicator, VSC OFF indicator and slip indicator lights all come on for approximately 3 seconds.

      HINT: 

      • 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) Refer to ABS Warning Light Remains ON [08/2015 - 08/2016]
      ABS warning light circuit (Does not come on) Refer to ABS Warning Light does not Come ON [08/2015 - 08/2016]
      Brake warning light circuit (Remains on) Refer to Brake Warning Light Remains ON [08/2015 - 08/2016]
      Brake warning light circuit (Does not come on) Refer to Brake Warning Light does not Come ON [08/2015 - 08/2016]
      TRAC OFF indicator light circuit (Remains on) Refer to VSC OFF Switch Circuit [08/2015 - 08/2016]
      TRAC OFF indicator light circuit (Does not come on) Refer to VSC OFF Switch Circuit [08/2015 - 08/2016]
      VSC OFF indicator light circuit (Remains on) Refer to VSC OFF Switch Circuit [08/2015 - 08/2016]
      VSC OFF indicator light circuit (Does not come on) Refer to VSC OFF Switch Circuit [08/2015 - 08/2016]
      Slip indicator light circuit (Remains on) Refer to Slip Indicator Light Remains ON [08/2015 - 08/2016]
      Slip indicator light circuit (Does not come on) Refer to Slip Indicator Light does not Come ON [08/2015 - 08/2016]
  2. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using Techstream) 

    HINT: 

    • If the ignition switch is turned from ON to 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 (brake actuator assembly) records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found.
    1. Procedure to enter Test Mode (signal check)
      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 (for manual transaxle).
      5. Check that the shift lever is in P (for continuously variable transaxle or automatic transaxle).
      6. Connect the Techstream to the DLC3.
      7. Turn the ignition switch to ON.
      8. Turn the Techstream on.
      9. Switch the skid control ECU (brake actuator assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.

        Chassis > ABS/VSC/TRAC > Utility 

        Tester Display
        Signal Check

        HINT: 

        Signals related to the VSC system can be inspected by performing a Test Mode (signal check) inspection. During the inspection, the display of items determined normal by the skid control ECU (brake actuator assembly) changes from incomplete to complete.

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

        HINT: 

        If the ABS warning and slip indicator lights do not blink, inspect the ABS warning and slip indicator light circuits.

      11. ABS Sensor Check

        HINT: 

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

    2. Acceleration Sensor Check
      1. Keep the vehicle stationary on a level surface for 1 second or more.

        HINT: 

        The acceleration sensor check can be performed with the master cylinder pressure sensor check below.

    3. Master Cylinder Pressure Sensor Check
      1. Start the engine.
      2. Keep the vehicle stationary without the brake pedal depressed for 1 second or more. After that, depress the brake pedal quickly and strongly with a force of more than 98 N (10 kgf, 22.0 lbf) within 0.1 seconds and keep depressing the brake pedal with the same amount of force for 1 second.
      3. Check that the ABS warning light stays on for 3 seconds.

        HINT: 

        • 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, 22.0 lbf) or more.
        • The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
        • If the master cylinder pressure sensor check is not completed, depressing the brake pedal causes further decreases in vacuum in the brake booster, making the sensor check difficult to complete.
        • If the vacuum is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient vacuum.
        • If the brake pedal is strongly depressed when the vacuum is insufficient, the brake warning light may come on in accordance with booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.
    4. 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.

        NOTE:
        • The speed sensor check may not complete 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).

        HINT: 

        • The sensor check may not complete if wheelspin occurs.
        • The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
      2. Check that the ABS warning light goes off.

        HINT: 

        • 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.
        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.

        HINT: 

        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.

    5. VSC Sensor Check

      HINT: 

      Check that the slip indicator light is blinking in the Test Mode pattern before performing the following VSC sensor check.

    6. Yaw Rate Sensor Zero Point Check
      1. Check that the shift lever is in neutral (for manual transaxle).
      2. Check that the shift lever is in P (for continuously variable transaxle or automatic transaxle).
      3. Keep the vehicle stationary on a level surface for 5 seconds or more after the ignition switch is turned to ON.
    7. VSC OFF Switch Check
      1. Press the VSC OFF switch.
      2. Check that the VSC OFF indicator light comes on.
      3. Press the VSC OFF switch again.
    8. 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:
        • When Test Mode (signal check) is started with the Techstream and all items display complete, the sensor check ends.
        • If the sensor check is not complete, the ABS warning light blinks when the vehicle is in motion and the ABS does not operate.
        • If a DTC is detected in Test Mode (signal check), the ABS warning light or slip indicator light illuminates.
    9. Test Mode (Signal Check) Inspection Item Chart
      Item Name Range Judgment Description Trouble Area
      Output Signal of Front Speed Sensor RH Incomplete/complete Check for foreign matter, check the gap between the sensor and rotor
      • Open or short in speed sensor
      • Open or short in sensor system wire harness
      • Defective connector contact or increased terminal resistance
      • Speed sensor installation defect
      • Sensor rotor system malfunction
      Output Signal of Front Speed Sensor LH Incomplete/complete Check for foreign matter, check the gap between the sensor and rotor
      • Open or short in speed sensor
      • Open or short in sensor system wire harness
      • Defective connector contact or increased terminal resistance
      • Speed sensor installation defect
      • Sensor rotor system malfunction
      Output Signal of Rear Speed Sensor RH Incomplete/complete Check for foreign matter, check the gap between the sensor and rotor
      • Open or short in speed sensor
      • Open or short in sensor system wire harness
      • Defective connector contact or increased terminal resistance
      • Speed sensor installation defect
      • Sensor rotor system malfunction
      Output Signal of Rear Speed Sensor LH Incomplete/complete Check for foreign matter, check the gap between the sensor and rotor
      • Open or short in speed sensor
      • Open or short in sensor system wire harness
      • Defective connector contact or increased terminal resistance
      • Speed sensor installation defect
      • Sensor rotor system malfunction
      Change in Output Signal of Front Speed Sensor RH Incomplete/complete
      • Check the stability of the sensor input waveform
      • Check the straight ahead / reverse signal inputs
      • Foreign object attached to speed sensor
      • Sensor rotor system malfunction
      Change in Output Signal of Front Speed Sensor LH Incomplete/complete
      • Check the stability of the sensor input waveform
      • Check the straight ahead / reverse signal inputs
      • Foreign object attached to speed sensor
      • Sensor rotor system malfunction
      Change in Output Signal of Rear Speed Sensor RH Incomplete/complete
      • Check the stability of the sensor input waveform
      • Check the straight ahead / reverse signal inputs
      • Foreign object attached to speed sensor
      • Sensor rotor system malfunction
      Change in Output Signal of Rear Speed Sensor LH Incomplete/complete
      • Check the stability of the sensor input waveform
      • Check the straight ahead / reverse signal inputs
      • Foreign object attached to speed sensor
      • Sensor rotor system malfunction
      Output Voltage Deceleration Sensor Incomplete/complete Check the acceleration sensor output voltage
      • Acceleration sensor zero point stored incorrectly
      • Acceleration sensor (airbag sensor assembly) connector connection malfunction
      • Acceleration sensor (airbag sensor assembly) internally stuck
      • Defective acceleration sensor (airbag sensor assembly) installation
      Memory System Information Incomplete/complete Check stored system information (skid control ECU (brake actuator assembly)) against vehicle specification
      • ECM incorrectly installed
      • Brake actuator assembly incorrectly installed
      • CAN communication between ECM and skid control ECU (brake actuator assembly)
      Output Master Cylinder Pressure Sensor Incomplete/complete
      • Check the master cylinder pressure sensor zero point voltage
      • Check that the sensitivity of the master cylinder pressure sensor is normal
      • Open circuit or short in master cylinder pressure sensor circuit
      • Open or short in stop light switch assembly circuit or defective connector connection
      • Stop light switch assembly stuck OFF
  3. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using SST Check Wire) 

    HINT: 

    • If the ignition switch is turned from ON to 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 (brake actuator assembly) records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found.
    1. Procedure to enter Test Mode (signal check)
      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 (for manual transaxle).
      5. Check that the shift lever is in P (for continuously variable transaxle or automatic transaxle).
      6. Using SST, connect terminals TS and CG of the DLC3.
        Fig 1: TS and CG of the DLC3 Connector End Views (1 Of 2)
        GTY438818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of DLC3
        • SST: 09843-18040 
      7. Turn the ignition switch to ON.
      8. Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.

        HINT: 

        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. ABS Sensor Check

        HINT: 

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

    2. Acceleration Sensor Check
      1. Keep the vehicle stationary on a level surface for 1 second or more.

        HINT: 

        The acceleration sensor check can be performed with the master cylinder pressure sensor check below.

    3. Master Cylinder Pressure Sensor Check
      1. Start the engine.
      2. Keep the vehicle stationary without the brake pedal depressed for 1 second or more. After that, depress the brake pedal quickly and strongly with a force of more than 98 N (10 kgf, 22.0 lbf) within 0.1 seconds and keep depressing the brake pedal with the same amount of force for 1 second.
      3. Check that the ABS warning light stays on for 3 seconds.

        HINT: 

        • 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, 22.0 lbf) or more.
        • The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
        • If the master cylinder pressure sensor check is not completed, depressing the brake pedal causes further decreases in vacuum in the brake booster, making the sensor check difficult to complete.
        • If the vacuum is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient vacuum.
        • If the brake pedal is strongly depressed when the vacuum is insufficient, the brake warning light may come on in accordance with booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.
    4. 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.

        NOTE:
        • The speed sensor check may not complete 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).

        HINT: 

        • The sensor check may not complete if wheelspin occurs.
        • The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
      2. Check that the ABS warning light goes off.

        HINT: 

        • 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.
        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.

        HINT: 

        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.

    5. VSC Sensor Check

      HINT: 

      Check that the slip indicator light is blinking in the Test Mode pattern before performing the following VSC sensor check.

    6. Yaw Rate Sensor Zero Point Check
      1. Check that the shift lever is in neutral (for manual transaxle).
      2. Check that the shift lever is in P (for continuously variable transaxle or automatic transaxle).
      3. Keep the vehicle stationary on a level surface for 5 seconds or more after the ignition switch is turned to ON.
    7. VSC OFF Switch Check
      1. Press the VSC OFF switch.
      2. Check that the VSC OFF indicator light comes on.
      3. Press the VSC OFF switch again.
    8. 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:
        • When Test Mode (signal check) is started with the Techstream and all items display complete, the sensor check ends.
        • If the sensor check is not complete, the ABS warning light blinks when the vehicle is in motion and the ABS does not operate.
        • If a DTC is detected in Test Mode (signal check), the ABS warning light or slip indicator light illuminates.
    9. Reading Sensor Check DTCs
      Fig 2: TS and CG of the DLC3 Connector End Views (2 Of 2)
      GTY453669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of DLC3
      1. 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.
        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.

        HINT: 

        • 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.

        • 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.

        HINT: 

        • 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.
    10. Sensor Check DTCs

      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 drive shaft assembly RH)
      72 Low Output Signal of Front Speed Sensor LH
      • Front speed sensor LH
      • Sensor installation
      • Front speed sensor rotor LH (front drive shaft 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 drive shaft assembly RH)
      76 Abnormal Change in Output Signal of Front Speed Sensor LH Front speed sensor rotor LH (front drive shaft 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)
      79 Acceleration Sensor Output Voltage Malfunction
      • Sensor installation
      • Acceleration sensor (airbag sensor assembly)
      81 Master Cylinder Pressure Sensor Output Malfunction
      • Stop light switch assembly
      • Master cylinder pressure sensor (brake actuator assembly)

      VSC Sensor

      DTC No. Detection Item Trouble Area
      71 Yaw Rate Sensor Malfunction Yaw rate sensor (airbag sensor assembly)

      HINT: 

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

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