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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge (Diagnostic Codes & Symptom Tests) >> Meter / Gauge System >> Tachometer Malfunction >> Procedure

Tachometer Malfunction: Procedure

  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Check for the DTC. Refer to DTC CHECK / CLEAR .
      RESULT:

      Result Proceed to
      CAN communication system DTC is not output A
      CAN communication system DTC is output B

    B → See step   7 

    A: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM (TACHOMETER) 
    1. Operate the Techstream according to the display and select "Active Test".
      COMBINATION METER:

      Tester Display Test Part Control Range Diagnostic Note
      Tachometer Operation Tachometer 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000 Confirm that vehicle is stopped and engine is idling

      OK

      Needle indication is normal.

    NG → See step   8 

    OK: Go to next step 

  3. READ VALUE USING TECHSTREAM (ENGINE SPEED) 
    1. Operate the Techstream according to the display and select "Data List".
      COMBINATION METER:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Rpm Engine speed / Min.: 0, Max.: 12750 Idling: 700 to 800 Unit: rpm

      OK

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

    NG → See step   4 

    OK → See step   9 

  4. READ VALUE USING TECHSTREAM (ENGINE SPEED) 
    1. Operate the Techstream according to the display and select "Data List".
      ENGINE:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Speed Engine speed / Min.: 0, Max.: 16383.75 Idling: 700 to 800 Unit: rpm

      OK

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

    NG → See step   10 

    OK: Go to next step 

  5. REPLACE NO. 1 METER ECU 
    1. Temporarily replace the combination meter with a new one. Refer to DISASSEMBLY .

    NEXT: Go to next step 

  6. CHECK NO. 1 METER ECU 
    1. Check that the operation of the tachometer returns to normal. Refer to OPERATION CHECK .

      OK

      Operation of tachometer returns to normal.

    NG → See step   11 

    OK → END (COMBINATION METER IS DEFECTIVE) 

  7. Go to CAN COMMUNICATION SYSTEM. Refer to  CAN COMMUNICATION SYSTEM 
  8. REPLACE NO. 1 METER ECU. Refer to  DISASSEMBLY 
  9. REPLACE NO. 1 METER ECU. Refer to  DISASSEMBLY 
  10. Go to SFI SYSTEM. Refer to  SFI SYSTEM 
  11. REPLACE ECM. Refer to  REMOVAL