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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 is on for 3 seconds.

      HINT:

      If the indicator check result is not normal, proceed to troubleshooting of the ABS warning light circuit (see ABS WARNING LIGHT CIRCUIT ).

      Fig 1: Locating ABS Indicator
      G02929595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. In case of not using 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 on the combination meter.

        HINT:

        • If no code appears, inspect the ABS warning light circuit or diagnostic circuit (see ABS WARNING LIGHT CIRCUIT  or TC TERMINAL CIRCUIT ).
          Fig 2: Identifying DLC3 Connector Terminals
          G02929596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • As an example, the blinking patterns of normal code and codes 11 and 21 are shown on the left.
      4. Codes are explained in the code table on page DIAGNOSTIC TROUBLE CODE CHART .
      5. After completing the check, disconnect terminals Tc and CG, and turn off the display.

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

      Fig 3: Diagnostic Trouble Code Blinking Pattern
      G02929597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. In case of using hand-held tester: Check the DTC.
      1. Connect the 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:

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

      Fig 4: Locating DLC3 Connector
      G02929598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. In case of not using 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.
        Fig 5: Identifying DLC3 Connector Terminals
        G02929599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Clear the DTC stored in the ECU by depressing the brake pedal 8 or more times within 5 seconds.
      4. Check that the warning light indicates the normal code.
      5. Remove the SST from the terminals of the DLC3.

        SST 09843-18040

      Fig 6: Clearing DTC Using Brake Pedal
      G02929600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. In case of using 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:

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

      Fig 7: Connecting The Hand-Held Tester To The DLC3
      G02929601Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. SPEED SENSOR SIGNAL CHECK (Test Mode) 

    HINT:

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

    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 CG of the DLC3.

        SST 09843-18040

        Fig 8: Identifying DLC3 Connector Terminals
        G02929602Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Start the engine.
        NOTE: Be sure to turn the ignition switch ON on flat place.
      4. Check that the ABS warning light blinks.

        HINT:

        If the ABS warning light does not blink, inspect the ABS warning light circuit and Ts circuit (see ABS WARNING LIGHT CIRCUIT , TS TERMINAL CIRCUIT ).

      5. Drive the vehicle straight forward.
        NOTE: Step the vehicle for 1 second after turning the ignition switch ON, and then start driving.
        Fig 9: ABS Warning Light Blinking Pattern
        G02929603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

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

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

        SST 09843-18040

      8. Turn the ignition switch ON.
      9. Read the number of blinks of the ABS warning light.
        Fig 10: Identifying DLC 3 Connector Terminals
        G02929604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        • See the DTC list 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).
        • If 2 or more malfunctions are indicated at the same time, the lowest numbered code will be displayed first.
      10. After doing the check, disconnect the SST from terminals Ts, Tc and CG of the DLC3, and turn the ignition switch OFF.
      Fig 11: ABS Malfunction Lamp Blinking Pattern
      G02929605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. In case of using hand-held tester: Check the sensor signal.
      1. Connect the hand-held tester to the DLC3.
      2. Do step (3), (5) and (6) described and on the previous page.
      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 12: Connecting The Hand-Held Tester To The DLC3
      G02929606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      DTC of speed sensor check function: 

      Fig 13: Speed Sensor DTC List
      G02929607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. DATA LIST 

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

    Fig 14: ABS Diagnostic Data List (1 Of 2)
    G02929608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 15: ABS Diagnostic Data List (2 Of 2)
    G02929609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. ACTIVE TEST 

    HINT:

    Performing the ACTIVE TEST using the hand-held tester allows the relay, 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 shorten the 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. From to the display on the tester, select the "ACTIVE TEST".

    HINT:

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

    Fig 16: Active Test Table
    G02929610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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