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Abs With EBD & BA & TRAC & VSC System - Diagnosis: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Check the warning lights.
      Fig 1: Identifying Warning Lights
      G01395932Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Release parking brake pedal.
      2. When the ignition switch is turned to the ON position, check that the ABS warning light, BRAKE warning light, VSC warning light, TRAC OFF indicator light (2WD) and SLIP indicator light stay on for approx. 3 seconds.

      HINT:

  2. DTC CHECK (USING SST CHECK WIRE) 
    1. Checking DTCs.
      1. Using SST(s), connect terminals Tc and CG of the DLC3.

        SST 09843-18040

        2. Fig 2: Identifying DLC3 Connector
        G01395934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Turn the ignition switch to the ON position.
      3. Read the DTC from the ABS warning light or VSC warning light on the combination meter.

        HINT:

        Fig 3: Identifying Blinking Patterns
        G01395936Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART  .
      5. After completing the check, disconnect terminal Tc and CG of the DLC3, and turn off the display.
    2. Clearing DTCs.
      1. Using SST(s), connect the terminals Tc and CG of the DLC3.

        SST 09843-18040

      2. Turn the ignition switch ON.
      3. Clear DTCs stored in ECU by depressing the brake pedal 8 or more times within 5 sec.
        4. Fig 4: Identifying Brake Pedal Operation
        G01395937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check that the ABS warning light and VSC warning light shows normal blinking patterns.
      5. Remove the SST(s) from the DLC3.

        SST 09843-18040

      HINT:

      Cancellation cannot be preformed by removing the battery cable or the ECU-IG2 fuse.

  3. DTC CHECK (USING HAND-HELD TESTER) 
    1. Checking DTCs.
      1. Connect the hand-held tester to the DLC3.
      2. Turn the ignition switch to the ON position.
      3. Read the DTCs by following the prompts on the tester screen.

      HINT:

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

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

      HINT:

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

  4. DATA LIST 

    HINT:

    With the hand-held tester connected to the DLC3 and the ignition switch on, the ABS, TRAC and VSC data list can be displayed. Follow the prompts on the tester screen to access the Data List.

    Fig 5: Data List (1 Of 3)
    G01395938Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Data List (2 Of 3)
    G01395939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 7: Data List (3 Of 3)
    G01395940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. ACTIVE TEST 

    HINT:

    Performing the ACTIVE TEST using the hand-held tester allows the relay and actuator, etc. to operate without removing any parts. Performing the ACTIVE TEST as the first step of troubleshooting is one of the methods to shorten labor 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 to the ON position.
    3. According to the display on the tester, perform the "ACTIVE TEST".

    HINT:

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

    Fig 8: Diagnosis Table (1 Of 2)
    G01395941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: Diagnosis Table (2 Of 2)
    G01395942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. FREEZE FRAME DATA 
    1. The vehicle (sensor) status, stored during ABS and/or VSC operation or at the time of an error code detection, can be displayed by the hand-held tester.
    2. Only one record of freeze frame data is stored and the freeze frame data generated during ABS and/or VSC operation are updated whenever the vehicle status is changed. Also, the number of the ignition switch is ON after the freeze frame data is stored can be stored up to 31 and it can be displayed. After storing the DTC, the freeze frame data is not up-dated.

      HINT:

      If the ignition switch "ON" operation exceeds 31 times, "31" appears on the display.

    3. If a malfunction occurs, the freeze frame data is stored but the ABS actuation data is deleted.
    Fig 10: Freeze Frame Data
    G01395943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. SENSOR SIGNAL CHECK (TEST MODE) (USING SST CHECK WIRE) 
    NOTE: When having replaced the yaw rate sensor (deceleration sensor) and/or ABS & TRAC actuator assembly (skid control ECU), perform zero point calibration of the yaw rate sensor and deceleration sensor (See step  9 .)

    HINT:

    • If the ignition switch is turned from ON to the ACC or LOCK position during test mode, DTC of sensor check function will be erased.
    • During test mode, ECU records all DTC of sensor check functions. By preforming sensor signal check, the codes are erased if normality is confirmed. The codes left over are the codes where an abnormality was found.
    1. Procedures for test mode:
      1. Turn the ignition switch off.
      2. Check that the steering wheel is in the straight ahead position and shift the shift lever is in the P position.
      3. Using SST(s), connect terminals Ts and CG of the DLC3.

        SST 09843-18040

        Fig 11: Identifying DL3C Connector
        G01395944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Turn the ignition switch to the ON position.
      5. Check that the ABS warning light and VSC warning light blink.
      Fig 12: Checking ABS & VSC Blinking Pattern
      G01395946Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If the ABS warning light and VSC warning light do not blink, inspect the ABS warning light circuit, VSC warning light and Ts terminal circuit.

      Trouble area See
      TS and CG terminal circuit TS AND CG TERMINAL CIRCUIT 
      ABS warning light circuit ABS WARNING LIGHT CIRCUIT (REMAINS ON) 
      VSC warning light circuit VSC WARNING LIGHT CIRCUIT (REMAINS ON) 
    2. Check the master cylinder pressure sensor:
      1. Leaving the vehicle in a stationary condition and the brake pedal in a free condition for 1 second or more continue to quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.

      HINT:

      • At this time, the ABS warning light stays on for 3 seconds.
      • While the ABS warning light stays on, continue to depress the brake pedal with a force of 98N (10 kgf) or more.
      • The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed.
      • If master cylinder pressure sensor check can not be completed, do not depress the brake pedal frequently. It may further reduce negative pressure and make the sensor check difficult to complete.
      • If the negative pressure is insufficient, master cylinder pressure sensor check may not be completed. In this case, idle the engine to get enough negative pressure.
      • If the brake pedal is depressed during engine stop, negative pressure may become insufficient and the BRL may come on. (It runs the motor and performs incorrect control.)
    3. Check the yaw rate sensor:
      1. Shift the shift lever to the D position and drive the vehicle at a speed of approx. 5 km/h (3 mph), turn the steering wheel either to the left or right 90° or more, and maintain a 180° circular drive for the vehicle.
        2. Fig 13: Identifying Start And End Position
        G01395947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Stop the vehicle and shift the shift lever to the P position, check that the skid control buzzer sounds for 3 sec.
      NOTE: Deceleration sensor check should be completed before performing speed sensor check.

      HINT:

      • If the skid control buzzer sounds, the sensor check is completed normally.
      • If the skid control buzzer does not sound, check the skid control buzzer circuit (See SKID CONTROL BUZZER CIRCUIT  ), then perform the sensor check again. If the skid control buzzer still does not sound, there is a malfunction in the VSC sensor, so check the DTC.
      • Drive the vehicle in a 180° circle. At the end of the turn, ensure that the vehicle is within +/- 5° exactly 180°, and facing the other direction from its original start position.
      • Do not spin the wheels.
    4. Check the speed sensor signal:
      1. Drive the vehicle straight forward at the speed of 45 km/h (28 mph) or higher for several seconds and check that the ABS warning light goes off.

        HINT:

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

      2. Stop the vehicle.
        NOTE:
        • Before performing speed sensor check, complete master cylinder pressure sensor and deceleration sensor checks.
        • Speed sensor check may not be completed if speed sensor check is started while turning the steering wheel or spinning the wheels.
        • After the ABS warning light goes off, if the vehicle speed exceeds 80 km/h, sensor check code is stored again. Decelerate or stop before the speed reaches 80 km/h.
        • If sensor check has not been completed, the ABS warning light blinks while driving and ABS system does not operate.

        HINT:

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

      3. Using SST(s), connect terminals Tc and CG of the DLC3.

        SST 09843-18040

        Fig 14: Identifying DL3C Connector
        G01395948Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Read the number of blinks of the ABS warning light and VSC warning light.

        HINT:

        • See the list of DTC. (See DIAGNOSTIC TROUBLE CODE CHART  )
        • If every sensor is normal, the normal blinking patterns are output. (A cycle of 0.25 seconds. ON and 0.25 seconds. OFF is repeated.)
        • If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
        Fig 15: Identifying Blinking Patterns
        G01395949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. After performing the check, disconnect the SST(s) from terminals Ts and CG, Tc and CG of the DLC3 and turn the ignition switch OFF.
  8. SENSOR SIGNAL CHECK (TEST MODE) (USING HAND-HELD TESTER) 
    NOTE: When having replaced the yaw rate sensor (deceleration sensor) and/or ABS & TRAC actuator assembly (skid control ECU), perform zero point calibration of the yaw rate sensor and deceleration sensor (See step  10 .)

    HINT:

    • If the ignition switch is turned from ON to the ACC or LOCK position during test mode, DTC of sensor check function will be erased.
    • During test mode, ECU records all DTC of sensor check function. By performing sensor signal check, the codes are erased if normality is confirmed. The codes left over are the codes where abnormality was found.
    1. Procedures for test mode:
      1. Turn the ignition switch off.
      2. Check that the shift lever position is in the P position.
      3. Connect the hand-held tester to the DLC3.
      4. Put the hand-held tester in test mode.
      5. Check that the ABS warning light and VSC warning light blink.
      Fig 16: Identifying Blinking Pattern
      G01395951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If the ABS warning light and VSC warning light do not blink, inspect the ABS warning light circuit and VSC warning light circuit.

      Trouble area See
      ABS warning light ABS WARNING LIGHT CIRCUIT (REMAINS ON) 
      VSC warning light VSC WARNING LIGHT CIRCUIT (REMAINS ON) 
    2. Check the master cylinder pressure sensor:
      1. Leaving the vehicle in a stationary condition and the brake pedal in a free condition for 1 second. or more, continue to quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.

      HINT:

      At this time, the ABS warning light stays on for 3 seconds.

    3. Check the yaw rate:
      1. Shift the shift lever to the D position and drive the vehicle at a speed of approx. 5 km/h (3 mph), and maintain a 180° circular drive for the vehicle.
        2. Fig 17: Identifying Start And End Position
        G01395952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Stop the vehicle and shift the shift lever to the P position, check that the skid control buzzer sounds for 3 seconds.

      HINT:

      • If the skid control buzzer sounds, the sensor check is completed normally.
      • If the skid control buzzer does not sound, check the skid control buzzer circuit (See SKID CONTROL BUZZER CIRCUIT  ), then perform the sensor check again. If the skid control buzzer still does not sound, there is a malfunction in the VSC sensor, so check the DTC.
      • Drive the vehicle in a 180° circle. At the end of the turn, ensure that the vehicle is within +/- 5° exactly 180°, and facing the other direction from its original start position.
      • Do not spin the wheels.
    4. Check the speed sensor:
      1. Drive the vehicle straight forward at the speed of 45 km/h (28 mph) or higher for several seconds and check that the ABS warning light goes off.

        HINT:

        The sensor check may not be completed if the vehicle has its wheels spun or its steering wheel is steered during this check.

      2. Stop the vehicle.
    5. Read the DTC by following the tester screen.

      HINT:

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

  9. IF NECESSARY, PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR (USING SST CHECK WIRE) 
    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it, and keep in a stationary condition. (Do not start the engine.)
    • Be sure to do this on a level surface (within an inclination of 1 %).
    1. Check that the steering wheel is in the straight-ahead position and shift the shift lever to the P position.
    2. Clear the zero point calibration:
      1. Turn the ignition switch to the ON position.
      2. Using SST(s), connect and disconnect terminals Ts and CG of the DLC3 4 times or more within 8 seconds.

        SST 09843-18040

        3. Fig 18: Identifying DL3C Connector
        G01395953Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Remove the SST(s) from the terminals of the DLC3
    3. Obtain the zero point calibration:
      1. Turn the ignition switch off.
      2. Using SST(s), connected terminals Ts and CG of the DLC3.

        SST 09843-18040

      3. Turn the ignition switch to the ON position.
      4. Keep the vehicle in the stationary condition on the level surface for 2 seconds. or more.
      5. Check that the VSC warning light blinks.

      HINT:

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

    4. Remove the SST(s) from the terminals of the DLC3.

      SST 09843-18040

    5. Turn the ignition switch off.
  10. IF NECESSARY, PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION SENSOR (USING HAND-HELD TESTER) 
    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it, and keep in a stationary condition. (Do not start the engine.)
    • Be sure to do this on a level surface (within an inclination of 1 %).
    1. Check that the steering wheel is in the straight-ahead position and shift the shift lever to P position.
    2. Hook up the hand-held tester to the DLC3.
    3. Turn the ignition switch to the ON position.
    4. Operate the hand-held tester to clear zero point calibration.
    5. Operate the hand-held tester to test mode.
    6. Obtain zero point of yaw rate sensor and deceleration sensor:
      1. Keep the vehicle in the stationary condition on the level surface for 2 seconds. or more.
      2. Check that the VSC warning light blinks.

      HINT:

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

    7. Turn the ignition switch off.
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