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Anti-Lock Brake System: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Check the warning lights and buzzer.
      1. Release parking brake lever.
      2. When the ignition switch is turned ON, check that the ABS warning lights go on for 3 seconds.
      3. Check the BRAKE warning light lights up when the ignition switch is turned ON and the light goes off when the engine starts.
      4. When depressing the brake pedal repeatedly it may turn on the BRAKE warning light and buzzer.

      HINT: 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 & Brake Warning Lamps
      G01060801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. In case of not using TOYOTA hand-held tester: Check the DTC.
      1. Disconnect the short pin from DLC1.
        Fig 2: View Of DLC1 Short Pin
        G01060802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Using SST, connect terminals Tc and E1 of DLC1 or Tc and CG of DLC3.

        SST 09843-18020 or 09843-18040

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

        HINT:

        • If no code appears, inspect the diagnostic circuit or ABS warning light circuit (See ABS WARNING LIGHT CIRCUIT  or TC TERMINAL CIRCUIT  ).
          Fig 3: View Of DLC1 & DLC3
          G01060803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • 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 DIAGNOSTIC TROUBLE CODE CHART  .
      6. After completing the check, disconnect terminals Tc and E1 of DLC1 or Tc and CG of DLC3, 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 4: Examples Of DTC Codes
      G01060804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. In case of using TOYOTA hand-held tester:

      Check the DTC.

      1. Hook up the TOYOTA hand-held tester to the DLC3.
      2. Read the DTC by following the prompts on the tester screen.

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

      Fig 5: Locating DLC3
      G01060805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. In case of not using TOYOTA hand-held tester:

      Clear the DTC.

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

        SST 09843-18020 or 09843-18040

      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 or DLC3.

        SST 09843-18020 or 09843-18040

      6. Connect the short pin to DLC1.

      HINT: Disconnecting the battery cable during repairs will not erase the DTC in the ECU.

    5. In case of using TOYOTA hand-held tester:

      Clear the DTC.

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

        (See TOYOTA hand-held tester operator's manual.)

    6. (Reference): Using TOYOTA break-out-box and TOYOTA hand-held tester, measure the ECU terminal values.
      1. Turn the ignition switch OFF.
      2. Hook up the TOYOTA break-out-box and TOYOTA hand-held tester to the vehicle.
      3. Turn the ignition switch ON.
      4. Read the ECU input/output values by following the prompts on the tester screen.

      HINT:

      • TOYOTA hand-held tester has a "Snapshot" function. This records the measured values and is effective in the diagnosis of intermittent problems.
      • Please refer to the TOYOTA hand-held tester/TOYOTA break-out-box operator's manual for further details.
    Fig 6: View Of Toyota Hand-Held Tester & Toyota Break-Out-Box
    G01060809Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 7: View Of DLC1 Terminals
    G01060810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. 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. In case of not using TOYOTA hand-held tester:

      Check the 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.
      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  or TS TERMINAL CIRCUIT  ).

      5. Keep the vehicle in the stationary condition on the flat place for 6 sec. or more.
      6. Shift the transfer lever in L4 position and turn the Center diff. lock switch ON.
      7. Shift the transfer lever back.
      8. Drive vehicle straight forward.

        When driving the vehicle with the speed faster than 45 km/h (28 mph) for several seconds, check that the ABS warning light comes off.

        Fig 8: Example Of Indicator Light Flashes (Single Code)
        G01060811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: There is a case that the sensor check is not completed if the vehicle has its rear wheels spun or its steering wheel steered during this check.

      9. Stop the vehicle.
      10. Check ABS warning light lights up when the rear diff. lock indicator light lights up.

        HINT: While the rear diff. is being locked, ECU records DTC 48.

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

        SST 09843-18020 or 09843-18040

      12. 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, a normal code is output (A cycle of 0.25 sec. ON and 0.25 sec. OFF is repeated).
        • If 2 or more malfunctions are indicated at the same time, the lowest numbered code will be displayed 1st.

        Fig 9: Example Of Indicator Light Flashes (2 Codes)
        G01060812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      13. After doing the check, disconnect the SST from terminals of DLC1 or terminals of DLC1 and DLC3, and turn the ignition switch OFF.

        SST 09843-18020 or 09843-18040

    2. In case of using TOYOTA hand-held tester:

      Check the sensor signal.

      1. Hook up the TOYOTA hand-held tester to the DLC3.
      2. Do step (3) to (9) on the previous page.
      3. Read the DTC by following the prompts on the tester screen.

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

    Fig 10: DTC Of Sensor Check Function
    G01060814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. DECELERATION SENSOR OPERATION DIAGNOSIS SYSTEM 
    CAUTION: While checking the deceleration sensor operating diagnosis system, ABS does not work and brake system works as a conventional brake system.
  4. DECELERATION SENSOR CHECK 
    1. Connect 3 dry batteries of 1.5 V in series.
    2. Connect VGS terminal to the batteries' positive (+) terminal, and GGND terminal to the batteries' negative (-) terminal, apply about 4.5 V between VGS and GGND terminals.
      NOTE: Do not apply voltage of 6 V or more to terminals VGS and GGND.
    3. Check the output voltage of GL1 terminals.
      Fig 11: Output Voltage Table
      G01060815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 12: Checking Output Voltage Of GL1 Terminals
      G01060816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • 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.
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