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Home >> Lexus >> 2003 >> ES 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 240 (Combination Meter - Diagnostics) >> Malfunction In Tachometer >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Start the inspection from step  11 when using the hand-held tester and start from step  2 when not using the hand-held tester.

  1. READ VALUE OF HAND-HELD TESTER (ENGINE SPEED SIGNAL) 
    1. Operate the hand-held tester according to the steps on the display and select "DATA LIST"

      ALL (ECM): 

      ECM SPECIFICATION

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

      OK: 

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

    1. NG: GO TO ENGINE CONTROL SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  (2AZ-FE) or  HOW TO PROCEED WITH TROUBLESHOOTING  (3MZ-FE)) 
    2. OK: Go to Next Step. 
  2. INSPECT COMBINATION METER ASSY 

    INSPECTION USING OSCILLOSCOPE 

    1. Check the input signal waveform.
      1. Remove the combination meter assy.
      2. Connect the oscilloscope to terminal C7-11 and body ground.
        Fig 1: Connecting Oscilloscope To Terminal C7-11 & Body Ground
        G03049728Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Start the engine.
      4. Check the signal waveform according to the condition(s) in SPECIFIED CONDITION  .
      SPECIFIED CONDITION

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

      OK: 

      As shown in  Fig 2 

      Fig 2: Identifying Waveform Signal
      G03049729Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Go to step   3 
    2. OK: REPLACE COMBINATION METER ASSY (SEE  OVERHAUL  ) 
  3. CHECK HARNESS AND CONNECTOR (BETWEEN ECM AND COMBINATION METER ASSY) (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Disconnect the C7 and E4 connectors.
    2. Measure the resistance according to the value(s) in SPECIFIED CONDITION  .

      Standard: 

      SPECIFIED CONDITION

      Tester Connection Specified Condition
      C7-11 - E4-5 Below 1 Ω
      C7-11 - Body ground 10 kΩ or higher
      Fig 3: Checking Between ECM & Combination Meter Assy
      G03049730Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: REPLACE ECM 
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