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Anti-Lock Brake System - Diagnosis: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Check the warning lights.
      1. Release the parking break pedal.
      2. When the ignition switch is turned ON, check that the ABS warning light, VSC warning light, TRAC OFF Indicator light*1 and SLIP indicator light goes on for approx. 3 seconds.

        *1: 2WD only

        Fig 1: Identifying Illumination Of Warning Lights
        G03381628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

    2. In case of not using LEXUS hand - held tester:

      Check the DTC.

      1. Using SST, connect terminals Tc and CG of DLC3.

        SST 09843-18040

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

        HINT:

        • If no code appears, inspect the diagnostic circuit, ABS warning light circuit or VSC waning light circuit.
          ABS WARNING LIGHT CIRCUIT OR VSC WANING LIGHT CIRCUIT TROUBLESHOOTING REFERENCE

          Trouble Area See Section
          Tc terminal circuit TC TERMINAL CIRCUIT 
          ABS warning light circuit ABS WARNING LIGHT CIRCUIT 
          VSC warning light circuit DTC ALWAYS ON MALFUNCTION IN ECU VSC WARNING LIGHT CIRCUIT 
          Fig 2: Identifying Terminals TC and CG Of DLC3
          G03381629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • As an example, the blinking patterns for normal code and codes 11 and 21 are shown on the left.
      4. Codes are explained in the code table DIAGNOSTIC TROUBLE CODE CHART  .
      5. After completing the check, disconnect terminals Tc and CG, and turn off the display.
        Fig 3: Blinking Patterns For Normal Code And Codes 11 And 21
        G03381630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If 2 or more malfunction codes are identified at the same time, the lowest numbered DTC will be displayed 1st.

    3. In case of using LEXUS hand - held tester:

      Check the DTC.

      1. Hook up the LEXUS hand - held tester to the DLC3.
      2. Turn the ignition switch ON.
      3. Read the DTC by following the prompts on the tester screen.
        Fig 4: Connecting Lexus Hand Held Tester To DLC3
        G03381631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

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

    4. In case of not using LEXUS hand-held tester:

      Clear the DTC.

      1. Using SST, connect terminals Tc and CG of DLC3.

        SST 09843-18040

      2. Turn the ignition switch ON.
      3. Clear the DTC stored in ECU by depressing the break 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 DLC3.

        SST 09843-18040

        Fig 5: Depressing Brake Pedal
        G03381632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        Cancellation cannot be done by removing the battery cable or ECU-IG fuse.

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

      Clear the DTC.

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

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

        Fig 6: Connecting Lexus Hand Held Tester To DLC3
        G03381633Courtesy 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 LEXUS hand-held tester:

      Check the ABS sensor signal.

      1. Turn the ignition switch OFF.
      2. Using SST, connect terminals Ts and CG of DLC3.

        SST 09843-18040

      3. Start the engine.
      4. Check that the ABS warning light blinks.
        Fig 7: Identifying Terminals TS, TC And CG Of DLC3
        G03381634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

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

      5. Keep the vehicle in the stationary condition on the flat place for 1 sec. or more.
      6. Keeping the vehicle in the stationary condition and the break pedal in free condition for 1 sec. or more, continue to depress the break pedal with 147 N (15 kgf, 33 lbf) or more for 1 sec. or more.
      7. Keeping the vehicle in the stationary condition, depress the brake pedal with 98 N (10 kgf, 22 lbf) or more quickly.
        Fig 8: Blinking Pattern Of ABS Warning Light
        G03381635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        The above mentioned condition comes into existence, the ABS warning light comes ON for 3 seconds.

      8. Drive vehicle straight forward.

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

        HINT:

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

      9. Stop the vehicle.
      10. Using SST, connect terminals Tc and CG of DLC3.

        SST 09843 - 18040

      11. Read the number of blinks of the ABS warning light.

        HINT:

        • See the list of DTC shown below.
        • 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.
      12. After doing the check, disconnect terminals Ts and CG, Tc and CG of DLC3, and turn the ignition switch OFF.

        SST 09843-18040

        Fig 9: Identifying Blinking Pattern Of Malfunction Code (72 And 76)
        G03381636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. In case of using LEXUS hand - held tester:

      Check the ABS sensor signal.

      1. Hook up the LEXUS hand-held tester to the DLC3.
      2. Do step  3 to  9.
      3. Read the DTC by following the prompts on the tester screen.

        HINT:

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

        Fig 10: Connecting Lexus Hand Held Tester To DLC3
        G03381637Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      DTC of ABS sensor check function: 

      DTC OF ABS SENSOR CHECK FUNCTION

      Code No. Diagnosis Trouble Area
      C1271 / 71 Low output voltage of right front speed sensor
      • Right front speed sensor
      • Sensor installation
      • Sensor rotor
      C1272 / 72 Low output voltage of left front speed sensor
      • Left front speed sensor
      • Sensor installation
      • Sensor rotor
      C1273 / 73 Low output voltage of right rear speed sensor
      • Right rear speed sensor
      • Sensor installation
      • Sensor rotor
      C1274 / 74 Low output voltage of left rear speed sensor
      • Left rear speed sensor
      • Sensor installation
      • Sensor rotor
      C1275 / 75 Abnormal change in output voltage of right front speed sensor Right front speed sensor rotor
      C1276 / 76 Abnormal change in output voltage of left front speed sensor Left front speed sensor rotor
      C1277 / 77 Abnormal change in output voltage of right rear speed sensor Right rear speed sensor rotor
      C1278 / 78 Abnormal change in output voltage of left rear speed sensor Left rear speed sensor rotor
      C1279 / 79 Deceleration sensor is faulty
      • Deceleration sensor
      • Sensor installation
      C1281 / 81 Master cylinder pressure sensor output signal is faulty Master cylinder pressure sensor
    3. In case of not using LEXUS hand-held tester:

      Check the VSC sensor signal.

      1. Turn the ignition switch OFF.
      2. Check that the shift lever position is at P range, turn the steering wheel to the neutral position.
      3. Using SST, connect terminals Ts and CG of DLC3.

        SST 09843-18040

      4. Start the engine.
        Fig 11: Identifying Terminals TS, TC And CG Of DLC3
        G03381638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Check that the VSC warning light blinks.

        HINT:

        If the VSC warning light does not blink, inspect the VSC warning light circuit and Ts terminal circuit (See DTC ALWAYS ON MALFUNCTION IN ECU VSC WARNING LIGHT CIRCUIT  and TS TERMINAL CIRCUIT  ).

      6. After a new ECU installed, the first time only:

        Start the engine and keep the vehicle in the stationary condition on the flat place for 3 sec. or more, it's installed the zero point calibration of the yaw rate sensor.

        Fig 12: Blinking Pattern Of VSC Warning Light
        G03381639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Check the steering angle sensor.

        Turn the steering wheel to either left or right to the full lock position, from the vehicle stationary condition, and turn back the steering wheel to the neutral position.

      8. Check the yaw rate sensor.

        Shift the shift lever to the D range and drive the vehicle at the vehicle speed of approx. 5 km/h (3 mph), turn the steering wheel either to left or right 90° or more, and maintain 180° circular drive for the vehicle.

        Stop the vehicle and shift the shift lever to the P position, check that the VSC buzzer sounds for 3 sec.

        Fig 13: Identifying Start And End Position Of Vehicle
        G03381640Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        • If the VSC buzzer sounds, the sensor check is in normal completion.
        • If the VSC buzzer does not sound, check the VSC buzzer circuit (See VSC BUZZER CIRCUIT  ), then do the sensor check again.
        • If the VSC buzzer still won't sound, there is a malfunction in the VSC sensor, so check the DTC.
        • Drive the vehicle in a 180° circle. At the end of the turn, the direction of the vehicle should be within 180° +/- 5° of its start position.
        • Do not spin the wheels.
      9. Using SST, connect terminals Tc and CG of DLC3.

        SST 09843-18040

      10. Read the number of blinks of the VSC warning light.

        HINT:

        • See the list of DTC shown below.
        • 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 14: Blinking Pattern Of Malfunction Code (72 And 71)
          G03381641Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      11. After doing the check, disconnect the SST from terminals Ts and CG, Tc and CG of DLC3 and turn the ignition switch OFF.

        SST 09843-18040

    4. In case of using LEXUS hand-held tester:

      Check the VSC sensor signal.

      1. Hook up the LEXUS hand-held tester to the DLC3.
      2. Do steps  2 and  4 to  8.
      3. Read the DTC by following the prompts on the tester screen.

        HINT:

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

        Fig 15: Connecting Lexus Hand Held Tester To DLC3
        G03381642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        DTC of VSC sensor check function: 

        DTC OF VSC SENSOR CHECK FUNCTION

        Code No. Diagnosis Trouble Area
        C0371 / 71 Yaw rate sensor output signal malfunction
        • Yaw rate sensor
        • Yaw rate sensor circuit
        C1208 / 72 Steering angle sensor output signal malfunction
        • Steering angle sensor
        • Steering angle sensor circuit
  3. YAW RATE SENSOR ZERO POINT CALIBRATION 

    HINT:

    When replacing the yaw rate sensor assembly or ECU, make sure to perform yaw rate sensor zero point calibration.

    Perform yaw rate sensor zero point calibration.

    1. Shift the shift lever in P position and turn the ignition switch ON, repeat connecting and releasing Ts and CG terminals of DLC3 4 times or more for 8 sec.

      HINT:

      When operation (1) is performed, DTC is deleted.

    2. Do not move the vehicle for 15 sec. or more.

      HINT:

      At this time VSC warning light is on for 15 sec. and goes off, and zero point calibration for yaw rate sensor is completed.

  4. 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.
  5. 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 - GGND terminals.
      NOTE:
      • When inspecting deceleration sensor, remove it with the bracket together. Do not remove the sensor from the bracket. When replacing deceleration sensor, replace the sensor with it assembled to the bracket assembly.
      • Do not apply voltage of 6 V or more to terminals VGS and GGND.
    3. Check the output voltage of GL1 and GL2 terminals.
      GL1 AND GL2 OUTPUT VOLTAGE

      Symbols Condition Standard Value
      GL1 Horizontal About 2.3 V
      GL1 Lean forward 0.4 V - about 2.3 V
      GL1 Lean rearward About 2.3 V - 4.1 V
      GL2 Horizontal About 2.3 V
      GL2 Lean forward About 2.3 V - 4.1 v
      GL2 Lean rearward 0.4 V - about 2.3 V
      Fig 16: Checking Deceleration Sensor
      G03381643Courtesy 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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