Test Mode Procedure [10/2023 - ]

HINT: 

• VSC does not operate in dealer mode (signal check mode), regardless of whether the sensor check is normal or abnormal.
• During dealer mode (signal check mode), the VSC system does not operate regardless of whether the system is normal or a malfunction is detected.
• When a malfunction occurs in an ABS system sensor, the ABS warning light illuminates.
• When a malfunction occurs in a VSC system sensor, the slip indicator light illuminates.
• When entering dealer mode (signal check mode), the skid control ECU communicates with the forward recognition camera to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit dealer mode (signal check mode) within 5 seconds of entering dealer mode (signal check mode).

1. Procedure to enter dealer mode (signal check mode).
   1. Turn the engine switch on (IG).
   2. Make sure the shift state is in park (P).
   3. Apply the parking brake.
   4. Put the steering wheel in the neutral position.
   5. Turn the engine switch off and connect the Techstream to the DLC3.
   6. Turn the engine switch on (IG) and turn the Techstream on.
   7. Enter the following menus: Chassis / Brake / Utility / Signal Check.

      Chassis > Brake > Utility 

      Tester Display
      Signal Check

      HINT: 

      Do not exit dealer mode (signal check mode) within 5 seconds of entering dealer mode (signal check mode). If dealer mode (signal check mode) is exited within 5 seconds of entering dealer mode (signal check mode), DTC U023A-87 may be stored. If DTC U023A-87 is output after exiting dealer mode (signal check mode), enter dealer mode (signal check mode) again, wait at least 5 seconds, then recheck for DTCs.

2. Confirm the system has entered dealer mode (signal check mode)
   1. Confirm that the ABS warning light and slip indicator light indicate the dealer mode (signal check mode) pattern (blinking at 0.25 seconds intervals).

      HINT: 

      • If the ABS warning light or slip indicator light remains illuminated or does not illuminate when dealer mode (signal check mode) is entered, a component or wire harness may be malfunctioning.
      • When entering dealer mode (signal check mode), if the parking brake is engaged, the parking brake indicator light (red) will illuminate, and if the parking brake is not engaged, the parking brake indicator light (red) will blink in the dealer mode (signal check mode) pattern (blinking at 0.25 seconds intervals).
      DEALER MODE (SIGNAL CHECK MODE) INSPECTION ITEM CHART
      
      

      Item Name	Range	Judgment Description	Trouble Area
      Output Signal of Front Speed Sensor RH	Incomplete/complete	Check for foreign matter, evaluate 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, evaluate 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, evaluate 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, evaluate 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	Evaluate the stability of the sensor input waveform Evaluate 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	Evaluate the stability of the sensor input waveform Evaluate 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	Evaluate the stability of the sensor input waveform Evaluate 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	Evaluate the stability of the sensor input waveform Evaluate the straight ahead / reverse signal inputs	Foreign object attached to speed sensor Sensor rotor system malfunction
      Output Master Cylinder Pressure Sensor	Incomplete/complete	Evaluate 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
      Judgment of Failure State	Incomplete/complete	Check that the brake pedal load sensing switch is normal	Open or short in brake pedal load sensing switch system wire harness Brake pedal load sensing switch stuck ON/OFF

1. Enter dealer mode (signal check mode).
2. 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.

1. Turn the engine switch on (IG).
2. Enter dealer mode (signal check mode).
3. Depress the brake pedal several times to release vacuum from the brake booster assembly with the engine stopped.
4. Check that the brake system warning light (red indicator) 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.)
5. 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.
6. Check that the brake system warning light (red indicator) goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged to be normal.)
7. Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
   NOTE:

   • If the brake pedal is depressed slowly or repeatedly, the master cylinder pressure sensor zero point calibration will not complete 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 dealer mode (signal check mode), enter dealer mode (signal check mode) again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.

1. With the vehicle stopped, release the brake pedal for 1 second or more and check that value of dealer mode (signal check mode) Data List item Output Master Cylinder Pressure Sensor changes from incomplete to complete.

   HINT: 

   • The status of the ABS warning light and slip indicator light will not change.
   • If the master cylinder pressure sensor is normal and the above step is performed when in dealer mode (signal check mode), the master cylinder pressure sensor check will complete normally.

1. Enter dealer mode (signal check mode).
2. Start the engine.
3. 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.

   • The sensor check may not be completed if wheelspin occurs.
   • The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
   • The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.

   HINT: 

   If the sensor check completes successfully, the ABS warning light turns off when the vehicle is being driven, and indicates the dealer mode (signal check mode) pattern (blinking at 0.25 seconds intervals) when the vehicle is stopped.

1. If the sensor check is completed, the ABS warning light and slip indicator light blink (Test Mode (signal check)) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.
   NOTE:

   • When dealer mode (signal check mode) is started with the Techstream and all items display complete, the sensor check ends.
   • If the sensor checks have not completed, the ABS warning light will remain blinking while the vehicle is being driven, and the ABS will not operate.
   • If a DTC is detected in dealer mode (signal check mode), the ABS warning light or slip indicator light illuminates.
   • If any DTCs are output or if dealer mode (signal check mode) items do not complete even after repeated attempts, repair or replace the malfunctioning part.

1. End dealer mode (signal check mode) using the Techstream
   1. Turn the engine switch off and enter normal mode.
   2. Remove the Techstream.