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Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis >> Electrical >> Gauges >> Meter >> Meter/Gauge System >> Tachometer Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Check for the DTC (See DTC CHECK/CLEAR  ).

      Result: 

      RESULT REFERENCE CHART

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

      B: Go to CAN COMMUNICATION SYSTEM  (See CAN COMMUNICATION SYSTEM )

      A: Go to Next Step 

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

      OK: 

      Needle indication is normal. 

      Combination Meter: 

      COMBINATION METER REFERENCE CHART

      Tester Display Test Part Control Range
      Tachometer operation Tachometer 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000

      HINT:

      Confirm that the vehicle is stopped and engine is idling.

      NG: REPLACE NO. 1 METER ECU (See  DISASSEMBLY   ) 

      OK: Go to Next Step 

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

      OK: 

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

      Combination Meter: 

      COMBINATION METER REFERENCE CHART

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

      NG: Go to step 4 

      OK: REPLACE NO. 1 METER ECU (See  DISASSEMBLY   ) 

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

      OK: 

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

      Engine: 

      ENGINE REFERENCE CHART

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

      NG: Go to SFI SYSTEM  (See SFI SYSTEM )

      OK: Go to Next Step 

  5. REPLACE NO. 1 METER ECU 
    1. Temporarily replace the combination meter with a new one (See DISASSEMBLY  ).
  6. CHECK NO. 1 METER ECU 
    1. Check the operation of the tachometer returns to normal (See OPERATION CHECK  ).

      OK: 

      Operation of tachometer returns to normal. 

      NG: REPLACE ECM  (See REMOVAL )

      OK: END (COMBINATION METER IS DEFECTIVE) 

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