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Inspection Procedure

  1. INSPECT COMBINATION METER ASSEMBLY (TAU-B) 
    1. Remove the combination meter assembly.
      Fig 1: Identifying C11 Combination Meter Assembly (TAU-B) Connector Terminals
      G05266038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

    Tester connection Condition Specified condition
    C11-2 (TAU-B INPUT) - Body ground Ignition switch ON 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. INSPECT COMBINATION METER ASSEMBLY (TAU-G) 
    1. Check the input signal waveform.
      1. Remove the combination meter assembly.
      2. Connect the oscilloscope to terminal C11-3 (TAU-G INPUT) and body ground.
        Fig 2: Identifying C11 Combination Meter Assembly (TAU-G) Connector Terminals
        G05266039Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Start the engine.
      4. Check the signal waveform according to the condition(s) in the table below.

    Waveform: 

    WAVEFORM REFERENCE TABLE

    Item Condition
    Tool setting 10V/DIV., 20 ms/DIV.
    Vehicle condition Engine idle speed
    Fig 3: Identifying Signal Waveform Graph
    G04966544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    As the engine speed goes higher, the frequency becomes shorter.

    NG: GO TO  SFI SYSTEM 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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