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Home >> Toyota >> 2009 >> Avalon XLS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter >> Meter / Gauge System >> Symptom Tests >> Tachometer Malfunction >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY TECHSTREAM (TACHOMETER OPERATION) 
    1. Connect Techstream to the DLC3.
    2. Ignition switch on (IG).
    3. Turn the tester on.
    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
    5. Check the operation by referring to the table below.

      Combination Meter: 

      ACTIVE TEST DETAIL - COMBINATION METER

      Tester Display Test Part Control Range
      Tacho Meter Operation Tachometer 0, 1000, 2000, 3000,4000, 5000, 6000, 7000 (rpm)

      OK: 

      Needle indication is normal. 

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: Go to next step 

  2. READ VALUE OF TECHSTREAM (ENGINE RPM) 
    1. Connect Techstream to the DLC3.
    2. Start the engine.
    3. Turn the tester on.
    4. Enter the following menus: Body Electrical / Combination Meter / Data List.
    5. Check the values by referring to the table below.

      Combination Meter: 

      DATA LIST - COMBINATION METER

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Rpm Engine speed/Min.: 0 rpm, Max.: 12750 rpm Almost same as actual engine speed (When engine is running) If data received from the ECM exceeds the range that can be displayed on the meter, the meter continues to display the maximum value of the range.

      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 TECHSTREAM (ENGINE SPEED) 
    1. Connect Techstream to the DLC3.
    2. Ignition switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List.
    5. Check the values by referring to the table below.

      Engine and ECT: 

      DATA LIST - ENGINE AND ECT

      Tester Display Measurement Item/Range Normal Condition
      Engine Speed Engine speed/Min.: 0 rpm, Max.: 16383.75 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 (2GR-FE)

    OK: Go to next step 

  4. CHECK HARNESS OR CONNECTOR (ECM - COMBINATION METER) 
    1. Disconnect the E2 and A55 connectors.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 1: View of Combination Meter Assembly With Wire Harness
    G00465552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Resistance

    Tester Connection (Symbols) Condition Specified Condition
    E2-14 (S) - A55-55 (TACH) Always Below 1
    E2-14 (S) - Body Ground Always 10 or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK: GO TO STEP  5

  5. INSPECT ECM (INPUT WAVEFORM) 
    1. Check the input signal waveform.
      1. Disconnect the E2 connector.
      2. Connect the oscilloscope to the terminals E2-14 (S) and body ground.
      3. Start the engine.
        Fig 2: Identifying Combination Meter Connector Terminals
        G05006143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check the signal waveform according to the condition(s) in the table below.
        WAVEFORM 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. 

    NG: Replace ECM 

    Fig 3: Waveform Graph
    G05006144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE COMBINATION METER ASSEMBLY 

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