ELECTRONICALLY CONTROLLED BRAKE SYSTEM TEST MODE PROCEDURE

WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

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

   Tech Tips

   
   

   • When the brake fluid level is low, the brake warning light / red (malfunction) comes on.

   • 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. Also, in this state, if the vehicle is under the following conditions and the brake hold switch is turned on, the brake hold operated indicator light blinks.

   
   

   • Vehicle Conditions:

   
   

   1. The driver side door is closed.

   2. The driver side seat belt is fastened.

   • 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

SENSOR CHECK USING TEST MODE (SIGNAL CHECK)

1. Procedure to Enter Test Mode (Signal Check)

   
   

   1. Turn the power switch on (IG).

   2. Check that the shift position is in P.

   3. Check that the steering wheel is centered.

   4. Turn the power switch off.

   5. Connect the GTS to the DLC3.

   6. Turn the power switch on (IG).

   7. Check that the parking brake is released.

   8. Turn the GTS on.

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

      
      Chassis > ABS/VSC/TRC > Utility

      Tester Display
      Signal Check

      Tech Tips

      Do not exit Test Mode within 5 seconds of entering Test Mode. If Test Mode is exited within 5 seconds of entering Test Mode, DTC U1104 may be stored. If DTC U1104 is output after exiting Test Mode, enter Test Mode again, wait at least 5 seconds, then recheck for DTCs.

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

       Tech Tips

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

   11. Check the ABS sensors.

       Tech Tips

       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.

      Tech Tips

      The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure 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, 22.0 lbf) for 1 second.

   2. Check that the ABS warning light remains on for 3 seconds.

      Tech Tips

      
      

      • Confirm that the ABS warning light comes on.

      • While the ABS warning light remains 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.

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 complete if wheelspin occurs.

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

   2. Stop the vehicle.

      Note

      
      

      • The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.

      • 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.

5. VSC Sensor Checks

   
   

   1. Check that the brake warning / yellow (minor malfunction) and slip indicator lights are blinking in the Test Mode pattern before performing the following VSC sensor checks.

6. VSC OFF Switch (No. 2 Combination Switch Assembly) Check

   
   

   1. Press the VSC OFF switch (No. 2 combination switch assembly).

   2. Check that the TRC OFF message is displayed on the multi-information display.

   3. Press the VSC OFF switch (No. 2 combination switch assembly) again.

   4. Check that the TRC OFF message is not displayed on the multi-information display.

7. 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.

   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.

8. End of Sensor Check

   
   

   1. When the sensor checks have 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

      When the acceleration sensor, speed sensor and master cylinder pressure sensor checks are complete, the sensor check is complete.

      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.

9. End of Test Mode (Signal Check)

   
   

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

10. 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 wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Front speed sensor rotor RH (Front axle hub sub-assembly RH)
    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 wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Front speed sensor rotor LH (Front axle hub sub-assembly LH)
    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 wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
    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 wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
    Change in Output Signal of Front Speed Sensor RH	Incomplete/complete	Check the stability of the sensor output waveform	Front speed sensor RH Front speed sensor rotor RH (Front axle hub sub-assembly RH)
    Change in Output Signal of Front Speed Sensor LH	Incomplete/complete	Check the stability of the sensor output waveform	Front speed sensor LH Front speed sensor rotor LH (Front axle hub sub-assembly LH)
    Change in Output Signal of Rear Speed Sensor RH	Incomplete/complete	Check the stability of the sensor output waveform	Rear speed sensor RH Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)
    Change in Output Signal of Rear Speed Sensor LH	Incomplete/complete	Check the stability of the sensor output waveform	Rear speed sensor LH Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)
    Output Voltage in Deceleration Sensor	Incomplete/complete	Check the acceleration sensor output voltage	Zero point calibration undone Improperly connected connector, deformation or corrosion of terminals Acceleration sensor (Yaw rate sensor) internal stuck malfunction Acceleration sensor (Yaw rate sensor) installed improperly
    Output in 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 or short in master cylinder pressure sensor Open or short in stop light switch assembly Stop light switch assembly stuck off malfunction
    Stroke Sensor Zero Point Learning	Incomplete/complete	Check the stroke sensor zero point output value	Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete) Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Brake pedal stroke sensor assembly