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Home >> Toyota >> 2006 >> Avalon XLS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter >> Meter / Gauge System >> Speedometer Malfunction >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Operate the intelligent tester according to the steps on the display and select the "ACTIVE TEST".

      METER: 

      METER REFERENCE

      Item Test Details Diagnostic Note
      SPEED METER 0 / 40 (24) / 80 (48) / 120 (72) / 160 (96) / 200 (120) / 240 (149) km/m (mph) -

      OK: 

      Needle indication is normal. 

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: GO TO NEXT STEP 

  2. READ VALUE OF INTELLIGENT TESTER (VEHICLE SPEED SIGNAL) 
    1. Operate the intelligent tester according to the steps on the display and select the "DATA LIST".

      METER: 

      METER REFERENCE

      Item Measurement Item / Range (Display) Test Details Diagnostic Note
      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. 

    NG: Go to step 3 

    OK: REPLACE COMBINATION METER ASSEMBLY 

  3. READ VALUE OF INTELLIGENT TESTER (VEHICLE SPEED SIGNAL) 
    1. Operate the intelligent tester according to the steps on the display and select the "DATA LIST".

      ABS: 

      ABS REFERENCE

      Item Measurement Item / Range (Display) Test Details Diagnostic Note
      (FR / FL / RR / RL) SPD 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. 

    NG: GO TO  BRAKE CONTROL 

    OK: GO TO NEXT STEP 

  4. 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 1: Inspecting Combination Meter Assembly
        G04379955Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      4. Check the signal waveform according to the condition(s) in the table below.

        OK: 

        The waveform is displayed as shown in  Fig 2 . 

        Fig 2: Signal Waveform Graph
        G04379956Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
        SIGNAL WAVEFORM REFERENCE

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

        HINT:

        As the vehicle speed increases, the cycle of the signal waveform narrows.

    NG: Go to step 5 

    OK: REPLACE COMBINATION METER ASSEMBLY 

  5. CHECK HARNESS AND CONNECTOR (ABS AND TRACTION ACTUATOR ASSEMBLY (VSC) - COMBINATION METER) 
    1. Disconnect the E3 and A34 (A40) connectors.
      Fig 3: Disconnecting E3 And A34 (A40) Connectors
      G04379957Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE REFERENCE

      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 

    OK: GO TO NEXT STEP 

  6. INSPECT COMBINATION METER ASSEMBLY 
    1. Disconnect the A34 (A40) connector.
      Fig 4: Identifying Combination Meter Assembly A34 (A40) Connector
      G04379958Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      VOLTAGE REFERENCE

      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: REPLACE COMBINATION METER ASSEMBLY 

    OK: GO TO  BRAKE CONTROL 

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