Inspection Procedure

HINT:

If there is an open or short in the engine coolant temperature sensor circuit, an SFI system DTC is output. If output, perform troubleshooting on the SFI system first.

1. CHECK CAN COMMUNICATION SYSTEM 
   1. Check for DTCs (See CAN COMMUNICATION SYSTEM ).

      Result 

      RESULT 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 (COOLANT TEMP) 
   1. Operate the Techstream according to the display and select Active Test.

      Combination Meter 

      DIAGNOSTIC NOTE CHART
      
      

      Tester Display	Test Part	Control Range	Diagnostic Note
      Water Temperature Meter Operation	Engine coolant temperature receiver gauge	LOW, NORMAL or HIGH	Perform the test with the vehicle stopped and engine idling.

      HINT:

      Confirm that the vehicle is stopped and the engine is idling.

      OK: Needle indication is normal. 

   NG: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL  )

   OK: Go to next step. 

3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE) 
   1. Operate the Techstream according to the display and select Data List.

      Combination Meter 

      DIAGNOSTIC NOTE CHART
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Coolant Temperature	Engine coolant temperature/Min.: -40 (-40), Max.: 140 (284)	After warming up: 80 to 105 (176 to 221)	Unit: °C (°F) If the value is -40 (-40): The sensor circuit is open If the value is 140 (284): The sensor circuit is shorted.

      OK: Coolant temperature displayed on the Techstream is between 80°C (176°F) and 95°C (203°F) after warming up. 

   NG: Go to step 4 

   OK: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL  )

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

      Engine 

      DIAGNOSTIC NOTE CHART
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Coolant Temp	Engine coolant temperature/Min.: -40°C (-40°F), Max.: 140°C (284°F)	80 to 100°C (176 to 212°F): After warming up	If the value is -40°C (-40°F): the sensor circuit is open. If the value is 140°C (284°F): the sensor circuit is shorted.

      OK: Engine coolant temperature value displayed on the Techstream is almost the same as actual engine coolant temperature. 

   NG: Go to SFI SYSTEM  (See PROBLEM SYMPTOMS TABLE )

   OK: Go to next step. 

5. REPLACE COMBINATION METER ASSEMBLY 
   1. Temporarily replace the combination meter with a new one (See REMOVAL  ).
6. CHECK COMBINATION METER ASSEMBLY 
   1. Check that the operation of the combination meter returns to normal (See OPERATION CHECK  ).

      OK: Operation of combination meter returns to normal. 

   NG: REPLACE ECM  (See REMOVAL )

   OK: END (COMBINATION METER IS DEFECTIVE)