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Home >> Lexus >> 2004 >> GX 470 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Combination Meter - Diagnosis >> Malfunction In Speedometer >> Inspection Procedure

Inspection Procedure

  1. INSPECT COMBINATION METER ASSY 

    (REFERENCE) INSPECTION USING OSCILLOSCOPE 

    1. Check the input signal waveform.
      1. Remove the combination meter assy.
      2. Connect the oscilloscope to the terminal C11-15 and C9-9 of combination meter assy.
      3. Start the engine.
      4. Check the signal waveform.
        Fig 1: Item Contents Chart
        G01423871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Fig 2: Inspecting Combination Meter Assy Terminal C11-15 And C9-9
        G01423872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        As the vehicle speed becomes higher, the cycle shorter.

        Fig 3: Identifying Signal Waveform
        G01423873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: CHECK AND REPLACE COMBINATION METER ASSY 
    2. NG: GO TO NEXT STEP. 
  2. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND COMBINATION METER ASSY) 
    1. Remove the combination meter.
    2. Disconnect the connector from skid control ECU.
    3. Check the continuity between terminal S10-16 (SP1) of skid control ECU and C11-15 of combination meter connector.

      Standard: There is continuity. 

      Fig 4: Checking Harness And Connector (Between Skid Control ECU And Combination Meter Assy)
      G01423874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: CHECK AND REPLACE SKID CONTROL ECU ASSY 
    2. NG: GO TO NEXT STEP. 

      REPAIR OR REPLACE HARNESS OR CONNECTOR