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Home >> Lexus >> 2017 >> IS 200t Base >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Stability Control System - Diagnostics - Introduction (1 Of 3) >> Vehicle Stability Control System >> Test Mode Procedure [04/2013 - 10/2016] >> Test Mode Procedure [04/2013 - 10/2016]
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Test Mode Procedure [04/2013 - 10/2016]

  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.

      HINT: 

      When the parking brake is applied or the brake fluid level is low, the brake warning light comes on.

    2. When the engine switch is turned on (IG), check that the ABS warning, brake warning, 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 [04/2013 - 08/2015] , or refer to ABS Warning Light Remains ON [08/2015 - 10/2016]
      ABS warning light circuit (Does not come on) Refer to ABS Warning Light does not Come ON [04/2013 - 09/2020]
      Brake warning light circuit (Remains on) Refer to Brake Warning Light Remains ON [04/2013 - 08/2015] , or refer to Brake Warning Light Remains ON [08/2015 - 10/2016]
      Brake warning light circuit (Does not come on) Refer to Brake Warning Light does not Come ON [04/2013 - 09/2020]
      VSC OFF indicator light circuit (Remains on) Refer to VSC OFF Switch Circuit [04/2013 - 08/2015] , or refer to VSC OFF Switch Circuit [08/2015 - 10/2016]
      VSC OFF indicator light circuit (Does not come on) Refer to VSC OFF Switch Circuit [04/2013 - 08/2015] , or refer to VSC OFF Switch Circuit [08/2015 - 10/2016]
      Slip indicator light circuit (Remains on) Refer to Slip Indicator Light Remains ON [04/2013 - 08/2015] , or refer to Slip Indicator Light Remains ON [08/2015 - 10/2016]
      Slip indicator light circuit (Does not come on) Refer to Slip Indicator Light does not Come ON [04/2013 - 09/2020]
  2. SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using Techstream) 

    HINT: 

    • If the engine 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 (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
      1. Turn the engine switch off.
      2. Check that the steering wheel is centered.
      3. Apply the parking brake.
      4. Check that the shift lever is in P.
      5. Connect the Techstream to the DLC3.
      6. Turn the engine switch on (IG).
      7. Turn the Techstream on.
      8. 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
      9. 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.

      10. Check the ABS sensors.

        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 by following the master cylinder pressure sensor check procedure below.

    3. Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration
      NOTE:

      Perform this check in the lost booster pressure state (vacuum in the booster is released by pumping the brake pedal).

      1. Turn the engine switch on (IG).
      2. Check that the brake warning light comes on when depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 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 59.0 N (6.0 kgf, 13.2 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.)
      5. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
        NOTE:
        • If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
        • If the lost booster pressure judgment check results are not normal, then the master cylinder pressure sensor check cannot be performed.
        • If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.

        HINT: 

        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 stored.

    4. Master Cylinder Pressure Sensor Check
      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, 22.0 lbf) for 1 second.
      2. 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.
    5. 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.

        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.
        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).
      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.

        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.

        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.

    6. VSC Sensor Check

      HINT: 

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

    7. Yaw Rate Sensor Zero Point Check
      1. Check that the shift lever is in P.
      2. Keep the vehicle stationary on a level surface for 5 seconds or more after the engine switch is turned on (IG).
    8. VSC OFF Switch (Combination Switch Assembly) Check
      1. Press the VSC OFF switch (combination switch assembly).
      2. Check that the VSC OFF indicator light comes on.
      3. Press the VSC OFF switch (combination switch assembly) again.
    9. 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.

    10. Reading Sensor Check DTCs
      1. Read the DTCs by following the Techstream 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.

        HINT: 

        See "Sensor Check DTCs".

      2. Turn the engine switch off and disconnect the Techstream.
    11. Sensor Check DTCs

      ABS Sensor

      DTC No. Detection Item Trouble Area
      C1270 Initialization Incomplete
      • ECM
      • CAN communication system (Skid control ECU to ECM)
      • Skid control ECU (brake actuator assembly)
      C1271 Low Output Signal of Front Speed Sensor RH
      • Sensor installation
      • for 2WD: Front speed sensor RH (front axle hub sub-assembly RH)
      • for AWD: Front speed sensor RH
      C1272 Low Output Signal of Front Speed Sensor LH
      • Sensor installation
      • for 2WD: Front speed sensor LH (front axle hub sub-assembly LH)
      • for AWD: Front speed sensor 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 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)
      C1279 Acceleration Sensor Output Voltage Malfunction
      • Sensor installation
      • Acceleration sensor (yaw rate and acceleration sensor)
      C1281 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
      C1473 Yaw Rate Sensor Malfunction Yaw rate sensor (yaw rate and acceleration sensor)

      HINT: 

      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) 

    HINT: 

    • If the engine 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 (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
      1. Turn the engine switch off.
      2. Check that the steering wheel is centered.
      3. Apply the parking brake.
      4. Check that the shift lever is in P.
      5. Using SST, connect terminals TS and CG of the DLC3.
        Fig 1: DLC3 Connector Terminals Identification
        GTY438847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of DLC3
        • SST: 09843-18040 
      6. Turn the engine switch on (IG).
      7. 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.

      8. Check the ABS sensors.

        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 by following the master cylinder pressure sensor check procedure below.

    3. Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration
      NOTE:

      Perform this check in the lost booster pressure state (vacuum in the booster is released by pumping the brake pedal).

      1. Turn the engine switch on (IG).
      2. Check that the brake warning light comes on when depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 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 59.0 N (6.0 kgf, 13.2 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.)
      5. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
        NOTE:
        • If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
        • If the lost booster pressure judgment check results are not normal, then the master cylinder pressure sensor check cannot be performed.
        • If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.

        HINT: 

        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 stored.

    4. Master Cylinder Pressure Sensor Check
      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, 22.0 lbf) for 1 second.
      2. 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.
    5. 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.

    6. VSC Sensor Check

      HINT: 

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

    7. Yaw Rate Sensor Zero Point Check
      1. Check that the shift lever is in P.
      2. Keep the vehicle stationary on a level surface for 5 seconds or more after the engine switch is turned on (IG).
    8. VSC OFF Switch (Combination Switch Assembly) Check
      1. Press the VSC OFF switch (combination switch assembly).
      2. Check that the VSC OFF indicator light comes on.
      3. Press the VSC OFF switch (combination switch assembly) again.
    9. 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.

    10. Reading Sensor Check DTCs
      Fig 2: DLC3 Connector Terminals Identification
      GTY438848Courtesy 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 engine switch off.
      4. Turn the engine switch on (IG) to cancel Test Mode.

        HINT: 

        • If the engine switch is not turned off and back on (IG) after SST is removed from the DLC3, the previous Test Mode will continue.
        • If the engine switch is turned back on (IG) with terminals TS and CG connected, the previous Test Mode will continue.
    11. Sensor Check DTCs

      ABS Sensor

      DTC No. Detection Item Trouble Area
      71 Low Output Signal of Front Speed Sensor RH
      • Sensor installation
      • for 2WD: Front speed sensor RH (front axle hub sub-assembly RH)
      • for AWD: Front speed sensor RH
      72 Low Output Signal of Front Speed Sensor LH
      • Sensor installation
      • for 2WD: Front speed sensor LH (front axle hub sub-assembly LH)
      • for AWD: Front speed sensor 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 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)
      79 Acceleration Sensor Output Voltage Malfunction
      • Sensor installation
      • Acceleration sensor (yaw rate and acceleration sensor)
      81 Master Cylinder Pressure Sensor Output Malfunction
      • Stop light switch assembly
      • Master cylinder pressure sensor (brake actuator assembly)
      88 Initialization Incomplete
      • ECM
      • CAN communication system (Skid control ECU to ECM)
      • Skid control ECU (brake actuator assembly)

      VSC

      DTC No. Detection Item Trouble Area
      71 Yaw Rate Sensor Malfunction Yaw rate sensor (yaw rate and acceleration sensor)

      HINT: 

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

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