ELECTRONICALLY CONTROLLED BRAKE SYSTEM > TEST MODE PROCEDURE

for Preparation Click here

1. Release the parking brake.
   

   NOTICE:

   Before releasing the parking brake, set chocks to hold the vehicle for safety.

   HINT:

   1. When the ignition switch is on, check that the ABS, BRAKE, brake control warning lights and SLIP indicator light come on for approximately 3 seconds.
      
   2. If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS, BRAKE, brake control warning light circuits, and SLIP indicator light circuit.
      If the indicator remains on, proceed to troubleshooting for the light circuit below.
      

   Trouble Area	See procedure
   ABS warning light circuit	Click here or Click here
   BRAKE warning light circuit	Click here or Click here
   Brake control warning light circuit	Click here or Click here
   SLIP indicator light circuit	Click here or Click here

1. When having replaced the skid control ECU and/or yaw rate and deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor.
   

   HINT:

   1. If the ignition switch is turned from the on to the ACC or off during test mode (signal check), DTCs of the signal check function will be erased.
      
   2. During test mode (signal check), the skid control ECU records all DTCs of the signal check function. By performing the test mode (signal check), the codes are erased if normality is confirmed. The remaining codes are the codes where an abnormality was found.
      





2. Procedures for test mode.
   
   

   1. Turn the ignition switch off.
      

   2. Connect the intelligent tester to the DLC3.
      

   3. Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position.
      

   4. Turn the ignition switch on.
      

   
   
   

   5. Set the intelligent tester to test mode (select "Signal Check").
      

      HINT:

      Refer to the intelligent tester operator's manual for further details.

   
   
   

   6. Check that the ABS and warning lights blink and "CHECK VSC SYSTEM" is displayed on the multi information display (test mode).
      

      HINT:

      If the ABS and brake control warning light do not blink, inspect the TS and CG terminal circuit, ABS warning light circuit and/or brake control warning light circuit.

   
   
   

   7. ABS SENSOR CHECK
      

      HINT:

      Check that the ABS warning light is blinking in test mode and perform the check.

1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
   

   HINT:

   Deceleration sensor check can be performed with the following 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 depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.
   

2. Check the ABS warning light stays on for 3 seconds.
   

   HINT:

   1. Ensure that the ABS warning light comes on.
      
   2. 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.
      
   3. The ABS warning light comes on for 3 seconds every time brake pedal operation above is performed.
      

1. Check the backward signal.
   
   

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

      HINT:

      Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 28 mph (45 km/h) or more.

2. Check the forward signal.
   
   

   1. Drive the vehicle straight forward.
      Drive the vehicle at a speed of 28 mph (45 km/h) or higher for several seconds and check that the ABS warning light goes off.
      

      HINT:

      The signal check may not be completed if the vehicle has its wheels spun or the steering wheel turned during this check.





3. Stop the vehicle.
   

   NOTICE:

   1. Before performing the speed sensor signal check, complete the deceleration sensor and master cylinder pressure sensor checks.
      
   2. The speed sensor signal check may not be completed if the speed sensor signal check is started while turning the steering wheel or spinning the wheels.
      
   3. After the ABS warning light goes off and if the vehicle speed exceeds 50 mph (80 km/h), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).
      
   4. If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.
      

   HINT:

   When the signal check has been completed, the ABS warning light goes off while driving and blinks in the test mode pattern while stationary.

   
   
   
   
   

   1. VSC SENSOR CHECK
      Check that the brake warning light blinks and "CHECK VSC SYSTEM" is displayed on the multi information display, and perform the check (refer to step 6).
      

1. Check the zero point voltage of the yaw rate sensor.
   
   

   1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
      





2. Check the output of the yaw rate sensor and the direction of the steering angle sensor.
   
   

   1. Move the shift lever to the D position, drive the vehicle at a speed of approximately 3 mph (5 km/h), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.
      

   2. Stop the vehicle and move the shift lever to the P position. Check that the skid control buzzer sounds for 3 seconds.
      

      HINT:

      1. If the skid control buzzer sounds, the signal check is completed normally.
         
      2. If the skid control buzzer does not sound, check the skid control buzzer circuit, then perform the signal check again.
         
      3. If the skid control buzzer does not sound yet, there is a malfunction in the yaw rate sensor, so check the DTC.
         
      4. Make 180° turn. At the end of the turn, the direction of the vehicle should be within 180° +- 5° of its start position.
         
      5. Do not spin the wheels.
         
      6. Do not turn the ignition switch off while turning.
         
      7. Do not move the shift lever to the P position while turning, but change in the vehicle speed, stopping, or driving in reverse is possible.
         
      8. Complete the turn within 20 seconds.
         

1. If the sensor check is completed, the ABS warning light blinks (test mode) when the vehicle stops and the ABS warning light is off when the vehicle is driving.
   

   NOTICE:

   1. When the yaw rate sensor, deceleration sensor, speed sensor and master cylinder pressure sensor checks are completed, the sensor check is completed.
      
   2. If the sensor check is not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.
      

1. Read the DTC(s) by following the tester screen.
   

   NOTICE:

   1. If the DTCs are displayed, repair the malfunctioning area and clear the DTCs.
      
   2. If the DTCs or test mode codes (DTC of signal check function) are displayed, repair the malfunctioning area, clear the DTCs and perform the test mode inspection.
      

   HINT:

   See the list of DTC.

HINT:

The codes in this table are output only in test mode (signal check).

1. When having replaced the skid control ECU and/or yaw rate and deceleration sensor, perform zero point calibration of the yaw rate and deceleration sensor.
   

   HINT:

   1. If the ignition switch is turned from the on to the ACC or off during test mode (signal check), DTCs of the signal check function will be erased.
      
   2. During test mode (signal check), the skid control ECU records all DTCs of the signal check function. By performing the test mode (signal check), the codes are erased if normality is confirmed. The remaining codes are the codes where an abnormality was found.
      





2. Procedures for test mode.
   
   

   1. Turn the ignition switch off.
      

   2. Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position.
      

   
   
   

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

      SST

      09843-18040  
      

   4. Turn the ignition switch on.
      

   
   
   

   5. Check that the ABS and brake control warning lights blink and "CHECK VSC SYSTEM" is displayed on the multi information display (test mode).
      

      HINT:

      If the ABS and brake control warning lights do not blink, inspect the TS and CG terminal circuit, ABS warning light circuit and/or brake control warning light (multi information display) circuit.

   
   
   

   6. ABS SENSOR CHECK
      

      HINT:

      Check that the ABS warning light is blinking in test mode and perform the check.

1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
   

   HINT:

   Deceleration sensor check can be performed with the following 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 depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.
   

2. Check the ABS warning light stays ON for 3 seconds.
   

   HINT:

   1. Ensure that the ABS warning light comes on.
      
   2. 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.
      
   3. The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed.
      

1. Check the backward signal.
   
   

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

      HINT:

      Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 28 mph (45 km/h) or more.

2. Check the forward signal.
   
   

   1. Drive the vehicle straight forward.
      Drive the vehicle at a speed of 28 mph (45 km/h) or higher for several seconds and check that the ABS warning light goes off.
      

      HINT:

      The signal check may not be completed if the vehicle has its wheels spun or the steering wheel turned during this check.





3. Stop the vehicle.
   

   NOTICE:

   1. Before performing the speed sensor signal check, complete the deceleration sensor and master cylinder pressure sensor checks.
      
   2. The speed sensor signal check may not be completed if the speed sensor signal check is started while turning the steering wheel or spinning the wheels.
      
   3. After the ABS warning light goes off, if vehicle speed exceeds 50 mph (80 km/h), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 50 mph (80 km/h).
      
   4. If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.
      

   HINT:

   When the signal check has been completed, the ABS warning light goes off while driving and blinks in the test mode pattern while stationary.

   
   
   
   
   

   1. VSC SENSOR CHECK
      Check that the brake control warning light blinks and "CHECK VSC SYSTEM" is displayed on the multi information display, and perform the check (refer to step 14).
      

1. Check the zero point voltage of the yaw rate sensor.
   
   

   1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
      





2. Check the output of the yaw rate sensor and the direction of the steering angle sensor.
   
   

   1. Move the shift lever to the D position, drive the vehicle at a speed of approximately 3 mph (5 km/h), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.
      

   2. Stop the vehicle and move the shift lever to the P position. Check that the skid control buzzer sounds for 3 seconds.
      

      HINT:

      1. If the skid control buzzer sounds, the signal check is completed normally.
         
      2. If the skid control buzzer does not sound, check the skid control buzzer circuit, then perform the signal check again.
         
      3. If the skid control buzzer does not sound yet, there is a malfunction in the yaw rate sensor, so check the DTC.
         
      4. Make a 180° turn. At the end of the turn, the direction of the vehicle should be within 180° +- 5° of its start position.
         
      5. Do not spin the wheels.
         
      6. Do not turn the ignition switch off while turning.
         
      7. Do not move the shift lever to the P position while turning, but change in the vehicle speed, stopping, or driving in reverse is possible.
         
      8. Complete the turn within 20 seconds.
         

1. If the sensor check is completed, the ABS warning light blinks (test mode) when the vehicle stops and the ABS warning light is off when the vehicle is driving.
   

   NOTICE:

   1. When the yaw rate sensor, deceleration sensor, speed sensor and master cylinder pressure sensor checks are completed, the sensor check is completed.
      
   2. If the sensor check is not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.
      

1. Using SST, connect terminals TC and CG of the DLC3.
   

   SST

   09843-18040  
   





2. Count the number of blinks of the ABS and brake control warning light, and read "DIAG VSC" indication on the multi information display.
   

   
   
   
   

   NOTICE:

   1. If the DTCs are displayed, repair the malfunctioning area and clear the DTCs.
      
   2. If the DTCs or test mode codes (DTC of signal check function) are displayed, repair the malfunctioning area, clear the DTCs and perform the test mode inspection.
      

   HINT:

   1. If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
      
   2. See the list of DTC.
      

3. After performing the check, disconnect the SST from terminals TS and CG, TC and CG of the DLC3 and turn the ignition switch off.
   

4. Turn the ignition switch on.
   

   HINT:

   If the ignition switch is not turned to the on after the SST is removed from the DLC3, the previous test mode will continue.

HINT:

The codes in this table are output only in test mode (signal check).