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Inspection Procedure

  1. SYSTEM CHECK 
    INSPECTION CHART

    w/ABS, w/VSC A
    w/o ABS B
    1. B: Go To step   3 

    A: Go To Next Step 

  2. READ VALUE OF HAND-HELD TESTER (VEHICLE SPEED SIGNAL) 
    1. Operate the hand-held tester according to the steps on the display and select "DATA LIST".
    DIAGNOSTIC CHART

    Item Measurement Item/Range (Display) Normal Condition Diagnostic Note
    (FR/FL/RR/RL) Wheel Speed Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph) Almost same as actual speed (When driving) -

    OK: Go To Next Step 

    Vehicle speed displayed on the tester is almost the same as the actual vehicle speed. 

    1. NG: GO TO BRAKE CONTROL SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 

    B: Go To Next Step 

    OK: Go To Next Step 

  3. INSPECT COMBINATION METER ASSY 

    INSPECTION USING OSCILLOSCOPE 

    1. Check the input signal wave form.
      Fig 1: Connecting Oscilloscope To Terminal C11-18 And Body Ground
      G02677811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the combination meter with connectors still connected.
    2. Connect the oscilloscope to terminal C11-18 and body ground.
    3. Start the engine.
    4. Check the signal wave form according to the condition(s) in the table below.
      Fig 2: Identifying Signal Wave Form Graph
      G02677812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ITEM CONDITION CHART

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

    OK: Go To Next Step 

    As shown in the illustration 

    HINT:

    As vehicle speed increases, the cycle of the signal wave form narrows.

    SIGNAL WAVE FORM DESCRIPTION

    OK A
    NG (w/ABS) B
    NG (w/o ABS) C
    NG (w/VSC) D
    1. B Go to step 4 
    2. C Go to step   8 
    3. D Go to step   6 

    A: Go To Next Step 

    REPLACE COMBINATION METER ASSY (SEE  COMBINATION METER ASSY  ) 

  4. CHECK HARNESS AND CONNECTOR (BETWEEN BRAKE ACTUATOR ASSY AND I COMBINATION METER ASSY) (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Disconnect the C11 and S1 connectors.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 3: Checking Harness And Connector
      G02677813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTIONS SPECIFIED CONDITIONS CHART (1 OF 6)

    Tester connection Condition Specified condition
    C11-18 -Body ground Always 10 k Ω or higher
    C11-18-S1-12 Always Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  5. INSPECT BRAKE ACTUATOR ASSY (ABS) 
    1. Disconnect the S1 connector.
    2. Measure the voltage according to the value(s) in the table below.
      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART (2 OF 6)

      Tester connection Condition Specified condition
      S1 -12 -Body ground Ignition switch ON 10 to 14 V
    3. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying S1 Connector
      G02677814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTIONS SPECIFIED CONDITIONS CHART (3 OF 6)

    Tester connection Condition Specified condition
    S1-1 -Body ground Always Below 1 Ω
    1. NG: REPLACE COMBINATION METER ASSY (SEE  COMBINATION METER ASSY  ) 

    OK: Go To Next Step 

    REPLACE BRAKE ACTUATOR ASSY (ABS) (SEE  REPLACEMENT  ) 

  6. CHECK HARNESS AND CONNECTOR (BETWEEN ABS & TRACTION ACTUATOR ASSY AND COMBINATION METER ASSY) (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Disconnect the C11 and S1 connectors.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 5: Disconnecting C11 And S1 Connectors
      G02677815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTIONS SPECIFIED CONDITIONS CHART (4 OF 6)

    Tester connection Condition Specified condition
    C11-18 -Body ground Always 10 k Ω or higher
    C11-18-S1-18 Always Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  7. INSPECT ABS & TRACTION ACTUATOR ASSY 
    1. Disconnect the S1 connector.
    2. Measure the voltage according to the value(s) in the table below.
      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART (5 OF 6)

      Tester connection Condition Specified condition
      S1 -18 -Body ground Ignition switch ON 10 to 14 V
    3. Measure the resistance according to the value(s) in the table below.
      Fig 6: Identifying S1 Connector
      G02677816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTIONS SPECIFIED CONDITIONS CHART (6 OF 6)

    Tester connection Condition Specified condition
    S1 -32 -Body ground Always Below 1 Ω
    1. NG: REPLACE COMBINATION METER ASSY (SEE  COMBINATION METER ASSY  ) 

    OK: Go To Next Step 

    REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  ) 

  8. INSPECT SPEEDOMETER SENSOR 
    1. Check voltage.
      1. Shift the shift lever to neutral.
      2. Jack up either of the front wheel.
      3. Turn the ignition switch to ON.
      4. Measure voltage between terminals 2 and 3 of speed sensor when the front wheel is turning slowly.
        Fig 7: Identifying Connector Terminal Of Speedometer Sensor
        G02677817Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage: 

      Voltage is generated intermittently. 

      Fig 8: Voltage Graph
      G02677818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE SPEEDOMETER SENSOR 

    OK: Go To Next Step 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEEDOMETER SENSOR CIRCUIT) 

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