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Anti-Lock Brake System - Diagnostics: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Check the indicator.

      When the ignition switch is turned ON, check that the ABS warning light goes on for 3 seconds.

      NOTE: If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit. See ABS WARNING LIGHT CIRCUIT .
      Fig 1: Locating ABS Warning Light W/ Or W/O Tachometer
      G02808856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Locating DLC1 Connector With Terminals Tc And E1
      G02808857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the DTC.
      1. Turn the ignition switch ON.
      2. Disconnect the short pin from DLC1.
      3. Using SST, connect terminals Tc and E1 of DLC1.

        SST 09843-18020

      4. Read the DTC from the ABS warning light on the combination meter.
        NOTE: If no code appears, inspect the ABS warning light circuit or diagnostic circuit. See ABS WARNING LIGHT CIRCUIT  or TC TERMINAL CIRCUIT .
        • As an example, the blinking patterns for normal code and codes 11 and 21 are shown on the left.
      5. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
      6. After completing the check, disconnect terminals Tc and E1 , and turn off the display.

      If 2 or more malfunctions are indicated at the same time the lowest numbered DTC will be displayed 1st.

      Fig 3: Illustrating Pattern Of Normal Code And Codes 11 And 21
      G02808858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Clear the DTC.
      1. Using SST, connect terminals Tc and E1 of DLC1.

        SST 09843-18020

      2. Turn the ignition switch ON.
      3. Clear the DTC stored in ECU by depressing the brake pedal 8 or more times within 5 seconds.
      4. Check that the warning light shows the normal code.
      5. Remove the SST from the terminals of DLC1.

        SST 09843-18020

        Fig 4: Depressing Brake Pedal For Clearing DTC Stored In ECU
        G02808859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. SPEED SENSOR SIGNAL CHECK 

    Check the speed sensor signal.

    1. Turn the ignition switch OFF.
    2. Using SST, connect terminals Ts and E1 of DLC1.

      SST 09843-18020

    3. Start the engine.
      Fig 5: Locating DLC1 Connector Terminals Ts And E1 Of Speed Sensor
      G02808860Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Check that the ABS warning light blinks.
      NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit. See ABS WARNING LIGHT CIRCUIT .
    5. Drive vehicle straight forward.
      NOTE: Drive vehicle faster than 45 km/h (28 mph) for several seconds.
    6. Stop the vehicle.
    7. Using SST, connect terminals Tc and E1 of DLC1.

      SST 09843-18020

    8. Read the number of blinks of the ABS warning light.
      • If every sensor is normal, a normal code is output (A cycle of 0.25 sec. ON and 0.25 sec. OFF is repeating).
      • If 2 or more malfunctions are indicated at the same time, the lowest numbered code will be displayed 1st.
      Fig 6: Illustrating Blinking Pattern Of ABS Warning Light
      G02808861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 7: Identifying Blinking Pattern Of Malfunction Code (Example Code 72, 76)
      G02808862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. After doing the check, disconnect terminals Ts and E1 , Tc and E1 of DLC1, and turn the ignition switch OFF.
    Fig 8: DTC Of Speed Sensor Check Function Table
    G02808863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. 4WD: DECELERATION SENSOR CHECK 
    1. Check the deceleration sensor detection point.
      1. Turn the ignition switch OFF.
      2. Using SST, connect terminals Ts and E1 of the DLC1.

        SST 09843-18020

      3. Start the engine.
        Fig 9: Locating DLC1 Connector Terminals Ts And E1 Of 4WD Deceleration Sensor
        G02808864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check that the ABS warning light blinks.
        NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit. See ABS WARNING LIGHT CIRCUIT .
        Fig 10: Identifying Blinking Pattern Of ABS Warning Light
        G02808865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Jack up the rear side of the vehicle slowly, as shown.
        NOTE: When measuring the height, measure at the center of the lower body of the vehicle.
        Fig 11: Jack Up Rear Side Of Vehicle Slowly
        G02808866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Check that the ABS warning light blinks.

        If the warning light turns on, inspect the deceleration sensor installation. If the sensor installation is OK, replace the deceleration sensor.

      7. Lower the vehicle slowly.
      8. Jack up the front side of the vehicle slowly, as shown.
        NOTE: When measuring the height, measure at the center of the lower body of the vehicle.
        Fig 12: Jack Up Front Side Of Vehicle Slowly
        G02808867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      9. Check that the ABS warning light blinks.

        If the warning light turns on, inspect the deceleration sensor installation. If the sensor installation is OK, replace the deceleration sensor.

      10. Lower the vehicle slowly.
    2. Check the deceleration sensor operation.
      1. Drive the vehicle straight ahead at about 20 km/h (12.4 mph) or more, lightly depress the brake pedal.
      2. Check that there is no change in the warning light pattern.
        Fig 13: Identifying Pattern Of Warning Light When Depressing Brake Pedal
        G02808868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Drive the vehicle straight ahead at about 20 km/h (12.4 mph) or more, and depress the brake pedal moderately.
      4. Check that the warning light turns on while braking.
        Fig 14: Identifying Blinking Pattern Of Warning Light When Depressing Brake Pedal Moderately
        G02808869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Drive the vehicle straight ahead at about 20 km/h (12.4 mph) or more, and depress the brake pedal strongly.
      6. Check that the warning light pattern changes while braking, as shown.

        If the operation is not as specified, inspect the deceleration sensor installation. If the sensor installation is OK, replace the deceleration sensor.

      7. Stop the vehicle and turn the ignition switch OFF.
      8. Remove SST from the terminals Ts and E1 of the DLC1.

        SST 09843-18020

        Fig 15: Identifying Blinking Pattern Of Warning Light When Depressing Brake Pedal Strongly
        G02808870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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