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Home >> Lexus >> 2013 >> GS 350 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge / Display (Diagnostic Codes & Symptom Tests) >> Meter / Gauge System >> Symptom Tests >> Engine Coolant Temperature Gauge Malfunction >> Procedure

Engine Coolant Temperature Gauge Malfunction: Procedure

  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if a CAN communication DTC is output. Refer to DIAGNOSIS SYSTEM [12/2011 - ] .
      RESULT

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

    B → See step   8 

    A: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM (WATER TEMPERATURE METER OPERATION) 
    1. Use the Active Test to check the operation of the engine coolant temperature receiver gauge. Refer to DATA LIST / ACTIVE TEST [12/2011 - ] .
      COMBINATION METER

      Tester Display Test Part Control Range Diagnostic Note
      Water Temperature Meter Operation Engine coolant temperature receiver gauge Low, Normal, High Confirm that the vehicle is stopped with the engine idling.

      OK

      Engine coolant temperature receiver gauge indication is normal.

    NG → See step   9 

    OK: Go to next step 

  3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE) 
    1. Use the Data List to check the engine coolant temperature. Refer to DATA LIST / ACTIVE TEST [12/2011 - ] .
      COMBINATION METER

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature/0 to 127.5°C (0 to 261.5°F) After warming up: 75 to 100°C (167 to 212°F) -

      OK

      Engine coolant temperature value displayed on the Techstream is almost the same as the engine coolant temperature receiver gauge indication.

    NG → See step   9 

    OK: Go to next step 

  4. READ VALUE USING TECHSTREAM (COOLANT TEMP) 
    1. Use the Data List to check the engine coolant temperature. Refer to DATA LIST / ACTIVE TEST [12/2011 - ] .
      ENGINE AND ECT

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp Engine coolant temperature/Min.: -40°C (-40°F), Max: 215°C (419°F) 75 to 100°C (167 to 212°F): After warming up -

      OK

      Engine coolant temperature value displayed on the Techstream is almost the same as the previously recorded value displayed on the Techstream.

    NG → See step   6 

    OK: Go to next step 

  5. CHECK COMBINATION METER ASSEMBLY 
    1. Replace the combination meter assembly with a new or normally functioning one. Refer to REMOVAL [12/2011 - ] .

      OK

      The operation of the engine coolant temperature gauge returns to normal.

    NG → See step   7 

    OK → END (COMBINATION METER ASSEMBLY WAS DEFECTIVE) 

  6. GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2011 - ] 
  7. REPLACE ECM. Refer to  REMOVAL [12/2011 - ] 
  8. GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2011 - ] 
  9. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2011 - ]