Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics): Pre-Check

1. Check the warning lights.
   1. Release the parking brake pedal.
   2. When the ignition switch is turned ON, check that the ABS warning light, VSC warning light, TRAC OFF indicator light, brake warning light and slip indicator light comes on for approx. 3 seconds.

   HINT:

   • When the parking brake is applied or the level of the brake fluid is low, the brake warning light comes on.
   • If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit, TRAC warning light circuit, TRAC OFF indicator light circuit, brake warning light circuit or slip indicator light circuit.
   Fig 1: Identifying Warning Lights

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   WARNING LIGHT TROUBLE AREA
   
   

   Trouble Area	Refer to
   ABS warning light circuit	ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)
   VSC warning light circuit	VSC WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)
   TRAC OFF indicator light circuit	TRAC OFF INDICATOR LIGHT, TRAC OFF SWITCH CIRCUIT
   Brake warning light circuit	BRAKE WARNING LIGHT CIRCUIT
   Slip indicator light circuit	SLIP INDICATOR LIGHT CIRCUIT

2. When not using the hand-held tester:

   Check the DTC.

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

      SST 09843-18040

   2. Turn the ignition switch ON.
   3. Read the DTC from the ABS warning light and VSC warning light on the combination meter.

      HINT:

      Fig 2: Connecting Terminals TC And CG Of DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • If no code appears, inspect the diagnostic circuit, ABS warning light circuit or VSC warning light circuit.
        ABS WARNING LIGHT CIRCUIT OR VSC WARNING LIGHT CIRCUIT TROUBLE AREA
        
        

        Trouble Area	Refer to
        TC terminal circuit	CIRCUIT INSPECTION
        ABS warning light circuit	ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)
        VSC warning light circuit	VSC WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)

      • As an example, the blinking patterns for normal code and codes 11 and 21 are shown on the left.
   4. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
   5. After completing the check, disconnect terminals TC and CG of the DLC3, and turn off the display.

   If 2 or more malfunction codes are identified at the same time, the DTC will be displayed in ascending order.

   Fig 3: Blinking Patterns For Normal Code And Codes 11 And 21

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. When not using the hand-held tester:

   Clear the DTC.

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

      SST 09843-18040

   2. Turn the ignition switch ON.
   3. Clear the DTC stored in the ECU by depressing the brake pedal 8 times or more within 5 seconds.
   4. Check that the warning light indicates the normal code.
      Fig 4: Depressing Brake Pedal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Remove the SST from the terminals of the DLC3.

      SST 09843-18040

   HINT:

   Cancellation cannot be performed by removing the battery cable or ECU-IG fuse.

4. When using the hand-held tester:

   Check the DTC.

   1. Connect hand-held tester to the DLC3.
   2. Turn the ignition switch ON.
   3. Read the DTC by following the prompts on the tester screen.

   HINT:

   Refer to the hand-held tester operator's manual for further details.

   Fig 5: Connecting Hand-Held Tester To DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. When using the hand-held tester:

   Clear the DTC.

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON.
   3. Operate the hand-held tester to erase the codes.

HINT:

Refer to the hand-held tester operator's manual for further details.

Fig 6: Connecting Hand-Held Tester To DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

According to the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor, actuator and so on without removing any parts. Reading the DATA LIST as a first step of troubleshooting is one of the method to shorten the labor time.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Read the "DATA LIST" on the tester.

HINT:

Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to operate without removing any parts. Performing the ACTIVE TEST as a first step of troubleshooting is one of the methods to reduce troubleshooting time.

It is possible to display the DATA LIST during the ACTIVE TEST.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Perform the "ACTIVE TEST", according to the display on the tester.

HINT:

Ignition switch must be turned ON to proceed to Active Test using a hand-held tester.

HINT:

• Whenever a DTC is detected or the ABS operates, the skid control ECU stores the current vehicle (sensor) state as freeze frame data.
• The skid control ECU stores the number of times (maximum: 31) the ignition switch has been turned from OFF to ON since the last time ABS was activated. However, if the vehicle was stopped or driver at low speed (7 km/h (4.3 mph) or less), or if a DTC is detected, the skid control ECU will not count the number since then.
• Freeze frame data at the time the ABS operates:

  The skid control ECU stores and updates data whenever the ABS system operates.

  When the ECU stores data at the time a DTC is detected, the data stored when the ABS operated is erased.

• Freeze frame data at the time a DTC is detected:

  When the skid control ECU stores data at the time a DTC is detected, no updates will be performed until the data is cleared.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. From the display on the tester, select the "FREEZE FRAME DATA".

ABS SENSOR SIGNAL CHECK (TEST MODE) 

HINT:

If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.

1. Procedures for test mode:
   1. Turn the ignition switch OFF.
   2. Move the shift lever to the P position.
   3. Using SST, connect terminals TS and CG of the DLC3.

      SST 09843-18040

   4. Check that the steering wheel is in the straight-ahead position.
   5. Turn the ignition switch ON.
   6. Check that the ABS warning light blinks.

   HINT:

   If the ABS warning light does not blink, inspect the ABS warning light circuit or TS terminal circuit.

   Fig 7: Connecting Terminals TS And CG Of DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   ABS WARNING LIGHT CIRCUIT OR TS TERMINAL CIRCUIT TROUBLE AREA
   
   

   Trouble Area	Refer to
   TS terminal circuit	Fig 2
   ABS warning light circuit	ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)

2. Check the brake pedal load sensing switch.
   1. By pumping the brake pedal, release the booster vacuum.
   2. Turn the ignition switch to ON (do not start the engine) and keep depressing the brake pedal for 1 second or more with a force of approximately 59 N (6 kgf, 14 Ibf) or more.
   3. Check that the brake warning light is illuminated and the operating sound of the ABS motor is heard.
   4. Start the engine and depress the brake pedal with a force of approximately 59 N (6 kgf, 14 Ibf) or more.
   5. Check that the brake warning light turns off.

   HINT:

   When rechecking, exit test mode and then activate test mode again.

3. Check the deceleration sensor.

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

4. Check the master cylinder pressure sensor.
   1. Leaving the vehicle in a stationary condition and the brake pedal in free condition for 1 second or more, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 Ibf) or more for 1 second or more.
   2. While the vehicle is stopped, release the brake pedal.
   3. While the vehicle is stopped, quickly depress the brake pedal once or more and check that the ABS warning light is illuminated for 3 seconds.

   HINT:

   Repeat the operation until the ABS warning light is illuminated.

5. Check the speed sensor signal.

   Drive the vehicle straightforward.

   Drive the vehicle with the speed faster than 45 km/h (28 mph) for several seconds and check that the ABS warning light turns off.

   HINT:

   The sensor check may not be completed if the wheels spin or the steering wheel is steered during this check.

6. Stop the vehicle.
7. Using SST, connect terminals TC and CG of the DLC3.

   SST 09843-18040

8. Read the number of blinks of the ABS warning light.

   HINT:

   • See the list of DTC on the next page.
   • If every sensor is normal, the normal code is output (a cycle of 0.25 seconds ON and 0.25 seconds OFF is repeated).
   • If 2 or more malfunctions are detected at the same time, the lowest numbered will be displayed first.
   Fig 8: Connecting Terminals TC And CG Of DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 9: Blinking Pattern Of Malfunction Code (Example Code 72, 76)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. After doing the check, disconnect the SST from terminals TS and CG, TC and CG of the DLC3 and turn the ignition switch OFF.

   SST 09843-18040

ABS SENSOR SIGNAL CHECK (TEST MODE) 

HINT:

If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.

1. Connect the hand-held tester to the DLC3.
2. Do steps  4 and from ( b) to  f on the previous pages.
3. Read the DTC by following the prompts on the tester screen.

HINT:

Please Refer to the hand-held tester operator's manual for further details.

Fig 10: Connecting Hand-Held Tester To DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC of ABS sensor check function: 

Fig 11: ABS Sensor Check Function DTC Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

VSC SENSOR SIGNAL CHECK (TEST MODE) 

HINT:

If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.

1. Procedures for test mode:
   1. Turn the ignition switch OFF.
   2. Check that the shift lever position is P. Turn the steering wheel to the straight-ahead position.
   3. Using SST, connect terminals TS and CG of the DLC3.

      SST 09843-18040

   4. Start the engine.
      Fig 12: Connecting Terminals TS And CG Of DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Check that the VSC warning light blinks.
   Fig 13: Blinking Pattern Of VSC Warning Light

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the yaw rate sensor.
   1. Move the shift lever to the D position and drive the vehicle at the vehicle speed of approximately 5 km/h (3 mph). Turn the steering wheel either to left or right for 90° or more, and maintain 180° circular drive for the vehicle.
   2. Stop the vehicle and move the shift lever to the P position. Check that the VSC warning buzzer sounds for 3 seconds.
      Fig 14: Checking Yaw Rate Sensor

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the VSC warning buzzer sounds, the sensor check is completed normally.

      If the VSC warning buzzer does not sound, check the VSC warning buzzer circuit, then do the sensor check again.

      VSC WARNING BUZZER CIRCUIT TROUBLE AREA
      
      

      Trouble Area	Refer to
      VSC warning buzzer circuit	VSC WARNING BUZZER CIRCUIT

      If the VSC warning buzzer still does not sound, there is malfunction in the VSC sensor, so check the DTC.

      HINT:

      • Drive the vehicle circularly 180°. At the end of the turn, the direction of the vehicle should be within 180°+/- 5° from its start position.
      • Do not spin the wheels.
   3. Check the steering angle sensor.

      Turn the steering wheel to either left or right to the full lock position, from the vehicle stationary condition, and turn back the steering wheel to the neutral position.

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

      SST 09843-18040

   2. Read the number of blinks of the VSC warning light.

      HINT:

      • See the list of DTC shown on the next page.
      • If every sensor is normal, a normal code is output (a cycle of 0.25 seconds ON and 0.25 seconds OFF is repeated).
      Fig 15: Connecting Terminals TC And CG Of DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. After doing the check, disconnect the SST from terminals TS and CG, TC and CG of the DLC3 and turn the ignition switch OFF.

   SST 09843-18040

VSC SENSOR SIGNAL CHECK (TEST MODE) 

HINT:

If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.

1. Connect the hand-held tester to the DLC3.
2. Do steps  2,  4 and  b on the previous pages.
3. Read the DTC by following the prompts on the tester screen.

HINT:

Please Refer to the hand-held tester operator's manual for further details.

Fig 16: Connecting Hand-Held Tester To DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC of VSC sensor check function: 

Fig 17: VSC Sensor Check Function DTC Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

IF NECESSARY, PERFORM ZERO POINT CALIBRATION OF YAW RATE AND DECELERATION SENSORS 

HINT:

• When having replaced the yaw rate sensor, deceleration sensor or/and the ECU, make sure to perform yaw rate sensor (including deceleration sensor) zero point calibration.
• This operation is also required when the deceleration sensor or yaw rate sensor has been replaced since the calibrated zero point of both sensors will be erased.

1. Clear the zero points of the yaw rate and deceleration sensors.
   1. Move the shift lever to P position.
   2. Turn the ignition switch ON in a stationary condition.
   3. With the ignition switch ON, using SST, repeat a cycle of short and open between terminals TS and CG of the DLC3 4 times or more within 8 seconds. Check that the TRAC OFF indicator and VSC warning lights are illuminated, indicating that the recorded zero point is erased.

      SST 09843-18040

   4. Turn the ignition switch OFF and VSC within 15 seconds.
      Fig 18: Connecting TS And CG Terminals Of DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Obtain zero point of the yaw rate sensor.
   1. Disconnect terminals TS and CG of the DLC3.
   2. Turn the ignition switch ON.

      HINT:

      The vehicle should be in a stationary condition with the shift lever in P position.

   3. Check that the TRAC OFF indicator and VSC warning light turns off about 15 seconds after the ignition switch is turned ON.

      HINT:

      Even if the ignition is not turned OFF in step  4 and remains ON, the yaw rate sensor zero point calibration can be completed. In this case, the TRAC OFF indicator and VSC warning lights are illuminated for about 15 seconds and then the VSC warning light starts blinking (normal code).

   4. After ensuring that the TRAC OFF indicator and VSC warning light remains OFF for 2 seconds, turn the ignition switch OFF.

   HINT:

   If the ignition switch is not turned OFF in step  4, make sure that the TRAC OFF indicator and VSC warning light blinks for 2 seconds. Then turn the ignition switch OFF.

3. Perform deceleration sensor zero point calibration.

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

   SST 09843-18040

2. Turn the ignition switch ON.

   HINT:

   Place the vehicle in a stationary condition with the shift lever in P position.

   Fig 19: Connecting Terminals TS And CG Of DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. After turning the ignition switch ON, check that the VSC warning light is illuminated for about 4 seconds and then starts quick blinking at 0.13 seconds intervals.
4. After ensuring the blinking of the VSC warning light for 2 seconds, turn the ignition switch OFF.
5. Remove the SST and disconnect terminals TS and CG of the DLC3.

   SST 09843-18040

Fig 20: Blinking Pattern Of VSC Warning Light

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

IF NECESSARY, PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR 

HINT:

When having replaced the yaw rate sensor and/or the brake actuator assembly, make sure to perform yaw rate sensor and deceleration sensor zero point calibration.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Move the shift lever to P position.
4. Operate the hand-held tester to clear zero point calibration.
5. Operate the hand-held tester to test mode.

   HINT:

   When the zero point memorized in the skid control ECU was cleared, the VSC warning light turns ON. When the zero point calibration is completed, the VSC warning light blinks.

6. Keep the vehicle in the stationary condition on the level surface for 2 seconds or more.
7. Check that the VSC warning light blinks.

   HINT:

   If the VSC warning light does not blink, perform the zero point calibration.

8. Turn the ignition switch OFF.