Inspection Procedure

HINT:

If there is an open or short in the engine coolant temperature sensor circuit, the ECM outputs the DTCs. Perform troubleshooting with the "SFI System" (See DTC CHECK / CLEAR for 2AZ-FE, DIAGNOSTIC TROUBLE CODE CHART for 2GR-FE).

1. CHECK CAN COMMUNICATION SYSTEM 
   1. Check if CAN communication DTC is output (See DIAGNOSIS SYSTEM ).

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      CAN communication DTC is not output.	A
      CAN communication DTC is output.	B (See DIAGNOSTIC TROUBLE CODE CHART )

   B:  Go TO CAN COMMUNICATION SYSTEM

   A: Go to next step 

2. PERFORM ACTIVE TEST BY TECHSTREAM 
   1. Connect Techstream to the DLC3.
   2. Ignition switch on (IG).
   3. Turn the tester on.
   4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
   5. Check the operation by referring to the values in the table below.

      Combination Meter: 

      ACTIVE TEST - COMBINATION METER
      
      

      Tester Display	Test Part	Control Range	Diagnostic Note
      Water Temperature Meter Operation	Engine coolant temperature receiver gauge	Low, Normal, Hi	-

      OK: 

      Needle indication is normal. 

   NG: REPLACE COMBINATION METER ASSEMBLY 

   OK: Go to next step 

3. READ VALUE OF TECHSTREAM 
   1. Connect Techstream to the DLC3.
   2. Ignition switch on (IG).
   3. Turn the tester on.
   4. Enter the following menus: Body Electrical / Combination Meter / Data List.

      Combination Meter: 

      DATA LIST - COMBINATION METER
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Coolant Temperature	Engine coolant temperature/Min.: 0°C (32°F), Max.: 127.5°C (261.5°F)	After warming up: 80 to 95°C (176 to 203°F)	If -40°C (-40°F): Sensor circuit open If 140°C (284°F) or more: Sensor circuit shorted

      OK: 

      Engine coolant temperature value displayed on the tester is almost the same as needle indication. 

   NG: REPLACE COMBINATION METER ASSEMBLY 

   OK: Go to next step 

4. READ VALUE OF TECHSTREAM 
   1. Connect Techstream to the DLC3.
   2. Ignition switch on (IG).
   3. Turn the tester on.
   4. Enter the following menus: Powertrain / Engine and ECT / Data List.
   5. Check the values by referring to the values in the table below.

      Engine and ECT: 

      DATA LIST - ENGINE AND ECT
      
      

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

      OK: 

      Engine coolant temperature value displayed on the tester is almost the same as actual engine coolant temperature. 

   NG: REPLACE ECM 

   OK: Go to next step 

5. REPLACE COMBINATION METER ASSEMBLY 
   1. Replace the combination meter assembly to a new or a normal one.

      OK: 

      The operation of the combination meter assembly returns to normal. 

   NG: REPLACE ECM 

   OK: END