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

  1. Diagnosis System 
    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 go on for approximately 3 seconds.
        NOTE: When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light is lit.
        Fig 1: Brake System Warning & Indicator Light Procedures
        G01081142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Fig 2: Locating Instrument Panel Brake System Related Warning & Indicator Lights
        G01081143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE: If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit, VSC warning light circuit, TRAC OFF indicator light circuit, BRAKE warning light circuit or SLIP indicator light circuit.
    2. In case of not using hand-held tester:

      Check the DTC of Skid Control ECU.

      1. Using SST, connect terminals Tc and E1 of the DLC1 or Tc and CG of the DLC3.

        SST 09843-18020 or 09843-18040

        Fig 3: Locating Terminals Tc & E1 Of DLC1 Or Tc & CG Of DLC3
        G01081145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Turn the ignition switch ON.
        3. NOTE: If no code appears, inspect the diagnostic circuit, ABS warning light circuit or VSC warning light circuit.
        Fig 4: Inspecting Tc, ABS & VSC Circuits
        G01081144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        As an example, the blinking patterns for normal code and codes 11 and 21 are shown in Fig 5.

        Fig 5: Reading DTCs Output By Flashes Of Indicator Light
        G01081146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Read the DTC from the ABS warning light and VSC warning light on the combination meter.
      4. Codes are explained in the DIAGNOSTIC TROUBLE CODE CHART .
      5. After completing the check, disconnect terminals Tc and E1 of the DLC1 or Tc and CG of the DLC3, and turn off the display.

        If 2 or more malfunction codes are identified at the same time, the lowest numbered DTC will be displayed first.

    3. In case of not using hand-held tester:

      Check the DTC of Translate ECU.

      1. Release the parking brake pedal.
      2. Check the brake fluid level.
      3. Using SST, connect terminals Tc and E1 of the DLC1 or Tc and CG of the DLC3.
        Fig 6: Locating Terminals Tc & E1 Of DLC1 Or Tc & CG Of DLC3
        G01081148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        SST 09843-18020 or 09843-18040

      4. Turn the ignition switch ON.
        5. NOTE:
        • If no code appears, inspect the diagnostic circuit, and BRAKE warning light circuit.
          Fig 7: Inspecting Ts & VSC Circuits
          G01081147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light is lit.
        • If every sensor is normal, a normal code is output. (A cycle of 0.25 seconds ON and 0.25 seconds OFF is repeated.)
        • If 2 or more malfunction codes are identified at the same time, the lowest numbered code will be displayed 1st.
          Fig 8: Displaying DTC's 42 & 44 In Chronological Order
          G01081149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Read the DTC from the BRAKE warning light.

    4. In case of using hand-held tester:

      Check the DTC.

      1. Hook up the hand-held tester to the DLC3.
        Fig 9: Connecting Hand Held Tester To DLC3
        G01081150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Turn the ignition switch ON.
        3. NOTE: Please refer to the hand-held tester operator's manual for further details.
      3. Read the DTC by following the prompts on the tester screen.

    5. In case of not using hand-held tester:

      Clear the DTC.

      1. Using SST, connect terminals Tc and E1 of the DLC1 or Tc and CG of the DLC3.

        SST 09843-18020 or 09843-18040

      2. Turn the ignition switch ON.
        3. NOTE: Cancellation cannot be done by removing the battery cable or ECU-IG fuse.
        Fig 10: Clearing DTC Using Brake Pedal
        G01081151Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Clear the DTC stored in ECU by depressing the brake pedal 8 times or more within 5 seconds.
      4. Check that the warning light shows the normal code.
      5. Remove the SST from the terminals of the DLC1 or DLC3.

        SST 09843-18020 or 09843-18040

    6. In case of using hand-held tester:

      Clear the DTC.

      1. Hook up the hand-held tester to the DLC3.
      2. Turn the ignition switch ON.
        3. NOTE: Please refer to the hand-held tester operator's manual for further details.
      3. Operate the hand-held tester to erase the codes.
      Fig 11: Connecting Hand Held Tester To DLC3
      G01081152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Speed Sensor Signal Check (Test Mode) 
    1. In case of not using hand-held tester:

      Check the sensor signal.

      1. Turn the ignition switch OFF.
      2. Using SST, connect terminals Ts and E1 of the DLC1.
        Fig 12: Locating Terminals E1, Ts & Tc Of DLC1
        G01081153Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        SST 09843-18020

      3. Start the engine.
        4. NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit. See ABS Warning Light Circuit .
        Fig 13: Reading DTCs Output By Flashes Of ABS Warning Light
        G01081154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check that the ABS warning light blinks.
      5. Drive vehicle straight forward.
        NOTE: The sensor check may not be completed if the front wheels are spun or the steering wheel is steered during this check.

        Drive vehicle at a speed faster than 45 km/h (28 mph) for several seconds. Check that the ABS warning light goes off.

      6. Stop the vehicle.
      7. Using SST, connect terminals Tc and E1 of the DLC1 or Tc and CG of the DLC3.

        SST 09843-18020 or 09843-18040

      8. Turn the ignition switch ON.
      9. Read the number of blinks of the ABS warning light.
        NOTE:

        See the list of DTCs shown in Fig 14.

        If every sensor is normal, a normal code is output (A cycle of 0.25 seconds ON and 0.25 seconds OFF is repeated).

        If 2 or more malfunction codes are identified at the same time, the lowest numbered code will be displayed first.

        Fig 14: Displaying Typical Code Output
        G01081155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      10. After doing the check, disconnect the SST from terminals of the DLC1 or DLC3, and turn the ignition switch OFF.

        SST 09843-18020 or 09843-18040

    2. In case of using hand-held tester:

      Check the sensor signal.

      1. Hook up the hand-held tester to the DLC3.
        Fig 15: Connecting Hand Held Tester To DLC3
        G01081156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Do steps ( 3) - ( 6).
        3. NOTE: Please refer to the hand-held tester operator's manual for further details.
      3. Read the DTC by following the prompts on the tester screen.

      DTC of speed sensor check function: 

      Fig 16: DTC's C1271/71-C1278/78
      G01081157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. NOTE: When replacing the steering angle sensor or ECU, or when adjusting the front wheel alignment or steering wheel center point in accordance with the removing and installing or replacing the suspension, axle or steering parts, make sure to perform steering angle sensor zero point calibration.
  3. Steering Angle Sensor Zero Point Calibration 
    1. Make sure the steering off center angle is < +/-3° when assembling of steering wheels (Smaller value is desirable).
    2. Turn the ignition switch ON.
    3. Using SST, connect terminals Ts and E1 of DLC1.

      SST 09843-18020

    4. Shift the shift lever to P range.
      5. NOTE: Press and hold the TRAC OFF switch until VSC buzzer sounds. When it starts sounding, turn off the switch.
    5. Press the TRAC OFF switch and hold it.
    6. Depress the brake pedal 3 times or more within 2 seconds.
    7. Check that the VSC buzzer sounds for 3 seconds.
      NOTE:
      • If the VSC buzzer sounds, the sensor calibration is in normal completion.
      • If the VSC buzzer does not sound, do the sensor calibration again.
      • If the VSC buzzer still will not sound, there is malfunction in the steering angle sensor, TRAC OFF switch circuit, VSC buzzer circuit or Skid Control ECU, so check the DTC and repair or replace them.
  4. Deceleration Sensor Check 
    1. Connect IGA terminal to the battery positive (+) terminal, and GND terminal to the battery negative (-) terminal, and apply about 12 V between IGA and GND terminals.
      Fig 17: Testing Deceleration Sensor
      G01081159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. NOTE:
      • If the sensor is tilted too much, it may show the wrong value.
      • If dropped, the sensor should be replaced with a new one.
      • The sensor removed from the vehicle should not be placed upside down.
      Fig 18: Identifying GL1 Voltages For Specified Conditions
      G01081158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the output voltage of GL1 terminal.
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