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Home >> Lexus >> 2008 >> RX 350 FWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter >> Meter / Gauge System >> Tachometer Malfunction >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER/ACTIVE TEST.
    5. Check the values by referring to the table below.

      METER: 

      METER SPECIFICATION

      Item Test Details Diagnostic Note
      TACHO METER 0, 1,000, 2,000, 3,000, 4,000, 5,000, 6,000, 7,000, 8,000 (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. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
    5. Check the values by referring to the table below.

      METER: 

      METER SPECIFICATION

      Item Measurement Item/Range (Display) 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. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / ENGINE / DATA LIST.
    5. Check the values by referring to the table below.

      ENGINE: 

      ENGINE REFERENCE CHART

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

    NG:  GO TO SFI SYSTEM

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    1. Disconnect the C8 and E6 connectors.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE CHART

      Tester Connection Condition Specified Condition
      C8-7 (TACHO) - E6-1 (TACH) Always Below 1 Ω
      C8-7 (TACHO) - Body ground Always 10 kΩ or higher
      Fig 1: Identifying C8 And E6 Connectors Terminals
      G05274143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  5. INSPECT COMBINATION METER 
    1. Check the input signal waveform.
      1. Remove the combination meter with the connector still connected.
      2. Connect the oscilloscope to terminal C8-7 (TACHO) and body ground.
      3. Start the engine.
      4. Check the signal waveform according to the condition (s) in the table below.
        WAVEFORM REFERENCE

        Item Condition
        Tool setting 5V/DIV., 10ms./DIV.
        Vehicle condition Engine idle speed
        Fig 2: Input Signal Waveform
        G05274144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK: The waveform is displayed as shown in  Fig 2 . 

    NG: REPLACE ECM 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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