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

Inspection Procedure

  1. PERFORM ACTIVE TEST BY ACTIVE TEST USING 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
    TACHOMETER 0 rpm / 1,000 rpm / 2,000 rpm / 3,000 rpm / 4,000 rpm / 5,000 rpm / 6,000 rpm / 7,000 rpm -

    OK: 

    Needle indication is normal. 

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: Go to Next Step 

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

    METER: 

    TEST DETAILS AND DIAGNOSTIC NOTE

    Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
    TACHO METER Engine speed / min.: 0 rpm, Max.: 12,750 rpm Almost same as actual engine speed (When engine is running) -

    OK: 

    Engine speed displayed on the tester is almost the same as the actual engine speed. 

    NG: Go to step 3 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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

    ENGINE: 

    TEST DETAILS AND DIAGNOSTIC NOTE

    Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
    ENGINE SPD Engine speed / min.: 0 rpm, Max.: 16,383 rpm Almost same as actual engine speed (When engine is running) -

    OK: 

    Engine speed displayed on the tester is almost the same as the actual engine speed. 

    NG: GO TO  ENGINE CONTROL SYSTEM -- AVALON 

    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 E2-14 (TACHO) and body ground.
      3. Start the engine.
        Fig 1: Identifying Combination Meter Assembly Connector Terminals E2-14 (TACHO)
        G05006143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check the signal waveform according to the condition(s) in the table below.
        WAVEFORM SIGNAL REFERENCE

        Item Condition
        Tool setting 5V/DIV., 10 ms/DIV.
        Vehicle condition Engine idle speed

        OK: 

        The waveform is displayed as shown in the illustration. 

    Fig 2: Signal Waveform Graph
    G05006144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step 5

    OK: REPLACE COMBINATION METER ASSEMBLY 

  5. CHECK HARNESS OR CONNECTOR (ECM - COMBINATION METER) 
    1. Disconnect the E2 and D41 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATIONS

      Tester Connection (Symbols) Condition Specified Condition
      E2-14 (TACHO) - D41-1 (TACH) Always Below 1 Ω
      E2-14 (TACHO) - Body ground Always 10 Ω or higher
    Fig 3: Identifying E2 And D41 Connectors
    G05006145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO  ENGINE CONTROL SYSTEM -- AVALON 

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