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Inspection Procedure

NOTE: If the vehicle speed is outside the allowable range when tested, perform the following procedure (See ON-VEHICLE INSPECTION  ).
  1. PERFORM ACTIVE TEST BY TECHSTREAM (SPEED METER OPERATION) 
    1. Connect Techstream to the DLC3.
    2. Ignition switch on (IG).
    3. Turn the tester on.
    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
    5. Check the operation by referring to the table below.

      Combination Meter: 

      ACTIVE TEST DETAIL - COMBINATION METER

      Tester Display Test Part Control Range
      Speed Meter Operation Speedometer 0, 40, 80, 120 mph ((1))
      0, 40, 80, 120, 160, 200, 240 km/h ((2))
      (1) U.S.A.
      (2) Except U.S.A.

      OK: 

      Needle indication is normal. 

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: Go to next step 

  2. READ VALUE OF TECHSTREAM (VEHICLE SPEED METER) 
    1. Connect Techstream to the DLC3.
    2. Ignition switch on (IG).
    3. Turn the tester on.
    4. Enter the following menus: Body Electrical / Combination Meter / Data List.
    5. Check the values by referring to the table below.

      Combination Meter: 

      DATA LIST - COMBINATION METER

      Tester Display Measurement Item/Range Normal Condition
      Vehicle Speed Meter Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph) Almost same as actual speed (When driving)

      OK: 

      Vehicle speed displayed on the tester is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer). 

    NG: Go to step 3 

    OK : REPLACE COMBINATION METER ASSEMBLY 

  3. READ VALUE OF TECHSTREAM (FR/FL/RR/RL WHEEL SPEED) 
    1. Connect Techstream to the DLC3.
    2. Ignition switch on (IG).
    3. Turn the tester on.
    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
    5. Check the values by referring to the table below.

      ABS/TRAC/VSC: 

      DATA LIST - ABS/TRAC/VSC

      Tester Display Measurement Item/Range Normal Condition
      FR/FL/RR/RL Wheel Speed Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Almost same as actual speed (When driving)

      OK: 

      Vehicle speed displayed on the tester is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer). 

    NG:  GO TO BRAKE CONTROL SYSTEM

    OK: Go to next step 

  4. INSPECT COMBINATION METER ASSEMBLY 
    1. Disconnect the A34 (A40) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A34-12 (SP1) (2)- Body ground Ignition switch on (IG) 10 to 14 V
      A40-23 (SP1) (1)- Body ground Ignition switch on (IG) 10 to 14 V
      (1) w/o VSC
      (2) w/ VSC

    NG:  Go to step  6

    Fig 1: Identifying Brake Actuator, ABS And Traction Actuator Connector Terminals
    G05006138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  5. INSPECT COMBINATION METER ASSEMBLY 
    1. Check the input signal waveform.
      1. Remove the combination meter assembly.
      2. Connect the oscilloscope to the terminals E3-14 (IS) and body ground.
      3. Start the engine.
        Fig 2: Identifying Combination Meter Connector Terminals
        G05006139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check the signal waveform according to the condition(s) in the table below.

        OK: 

        The waveform is displayed as shown in the illustration. 

        WAVEFORM REFERENCE

        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Driving at approx. 20 km/h (12 mph)

        HINT:

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

        Fig 3: Waveform Graph
        G05407654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY 

    OK : REPLACE COMBINATION METER ASSEMBLY 

  6. CHECK HARNESS AND CONNECTOR (ABS AND TRACTION ACTUATOR ASSEMBLY (VSC) - COMBINATION METER) 
    1. Disconnect the E3 and A34 (A40) connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      E3-14 (SI) - A34-12 (SP1)(2) Always Below 1 Ω
      E3-14 (SI) - A40-23 (SP1) (1) Always Below 1 Ω
      E3-14 (SI) - Body ground Always 10 kΩ or higher
      (1) w/o VSC
      (2) w/ VSC

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Identifying ABS And Traction Actuator Assembly And Combination Meter Connector Terminals
    G05006141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE COMBINATION METER ASSEMBLY 

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