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Anti-Lock Brake System - Diagnostics: Pre-Check

  1. Diagnosis system  :
    1. Check the warning lights.
      Fig 1: Locating Brake & ABS Check Warning Lights (USA & CANADA)
      G01081428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Release the parking brake pedal.
        2. NOTE:

        When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light is lit.

        If the warning light check result is not normal, proceed to troubleshooting for the ABS warning light circuit and BRAKE warning light circuit.

        When isolating abnormal warning light check results, see ABS WARNING LIGHT CIRCUIT  and BRAKE WARNING LIGHT CIRCUIT 

      2. When the ignition switch is turned ON, check that the ABS warning light and BRAKE warning light go on for approximately 3 seconds.
    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.
        Fig 2: Locating DLC1 Terminals E1 & Tc And DLC3 Terminals Tc & CG
        G01081430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        SST 09843-18020 or 09843-18040

      2. Turn the ignition switch ON.
        3. NOTE:
        • If no code appears, inspect the diagnostic circuit, ABS warning light circuit or BRAKE warning light circuit. See TC TERMINAL CIRCUIT , ABS WARNING LIGHT CIRCUIT  or BRAKE WARNING LIGHT CIRCUIT 
        • When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light is lit.
        • As an example, the blinking patterns for normal code and codes 11 and 21 are shown in Fig 3.
        Fig 3: Reading DTCs Output By Flashes Of ABS Warning Light
        G01081431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Read the DTC from the ABS warning light, on the combination meter.
      4. Codes are explained in the code table. See 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 malfunctions are indicated at the same time the lowest numbered DTC will be displayed 1st.

    3. In case of using hand-held tester:

      Check the DTC.

      1. Hook up the hand-held tester to the DLC3.
        Fig 4: Connecting Hand Held Tester To DLC3
        G01081432Courtesy 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.
    4. In case of not using hand-held tester:

      Clear the DTC of skid control ECU.

      NOTE: Cancellation cannot be done by removing the battery cable or ECU-IG fuse.
      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. Clear the DTC stored in ECU by depressing the brake pedal 8 or more times within 5 seconds.
        Fig 5: Inputting Brake Pedal Depressed Signal By Ensuring Stop Light Switch Activation & Deactivation
        G01081433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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

    5. 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 6: Connecting Hand Held Tester To DLC3
      G01081434Courtesy 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 7: Locating Terminals E1, Ts & Tc Of DLC1
        G01081435Courtesy 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 8: Identifying Blinking Duration
        G01081436Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check that the ABS warning light blinks.
        5. NOTE: The sensor check may not be completed if the front wheels are spun or the steering wheel is steered during this check.
      5. Drive vehicle straight forward.

        Drive vehicle at a speed faster than 45 km/h (28 mph) for several seconds and check that the ABS warning light comes 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. NOTE:
        • See the list of DTC shown on Fig 11.
        • 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 9: Reading DTCs Output By Flashes Of ABS Warning Light
        G01081437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      9. Read the number of blinks of the ABS warning light.
      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.
      2. Do step ( 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.
      Fig 10: Connecting Hand Held Tester To DLC3
      G01081438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 11: Isolating Speed Sensor Check Function DTC's
      G01081439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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