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Home >> Toyota >> 2007 >> Avalon XLS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter >> Meter / Gauge System >> Speedometer Malfunction >> Inspection Procedure

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

    METER: 

    TEST DETAILS AND DIAGNOSTIC NOTE

    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: 

    DATA LIST

    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 measured using a speedometer tester (calibrated chassis dynamometer). 

    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: 

    DIAGNOSTIC NOTE AND TEST DETAILS

    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 measured using a speedometer tester (calibrated chassis dynamometer). 

    NG: GO TO  BRAKE CONTROL -- AVALON 

    OK: Go to Next Step 

  4. INSPECT COMBINATION METER ASSEMBLY 
    1. Disconnect the A34 (A40) connector.
      2. Fig 1: Identifying Combination Meter Assembly A34 (A40) Connector
      G05006138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      VOLTAGE SPECIFICATIONS

      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

    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 Assembly Terminals E3-14 (IS)
        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 SIGNAL

        Item Condition
        Tool setting 5 V/DIV., 20 ms/DIV.
        Vehicle condition Driving at approx. 20 km/h (12 mph)
        Fig 3: Signal Waveform Graph
        G05006140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

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

    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. Fig 4: Identifying E3 And A34 (A40) Connectors
      G05006141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATIONS

      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 Ω or higher
      (1) w/o VSC
      (2) w/ VSC

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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