Inspection Procedure

HINT:

If there is an open or short in the engine coolant temperature sensor circuit, the ECM outputs the DTCs. Troubleshoot SFI System (See DTC P0115 ENGINE COOLANT TEMPERATURE CIRCUIT MALFUNCTION; DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT LOW INPUT; DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT for 2AZ-FE, FAIL-SAFE for 2ZR-FE).

1. CHECK CAN COMMUNICATION SYSTEM 
   1. Check if a 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

   B: GO TO CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   A: Go to Next Step 

2. PERFORM ACTIVE TEST USING TECHSTREAM (WATER TEMPERATURE METER OPERATION) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
   5. Check the operation by referring to the table below.

   Combination Meter 

   CONTROL RANGE REFERENCE
   
   

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

   OK: 

   Gauge indication is normal  .

   NG: REPLACE COMBINATION METER (See  COMBINATION METER  ) 

   OK: Go to Next Step 

3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Body Electrical / Combination Meter / Data List.

   Combination Meter 

   ITEM RANGE REFERENCE CHART
   
   

   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) or less: Sensor circuit open If 140°C (284°F) or more: Sensor circuit shorted

   OK: 

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

   NG: REPLACE COMBINATION METER (See  COMBINATION METER  ) 

   OK: Go to Next Step 

4. READ VALUE USING TECHSTREAM (COOLANT TEMP) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine and ECT / Data List.
   5. Check the values by referring to the table below.

   Engine and ECT (for 2AZ-FE) 

   ITEM RANGE REFERENCE
   
   

   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 value -40°C (-40°F): sensor circuit open If value 140°C (284°F): sensor circuit shorted

   Engine and ECT (for 2ZR-FE) 

   ITEM RANGE REFERENCE
   
   

   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 value -40°C (-40°F): sensor circuit open If value 140°C (284°F): sensor circuit shorted

   OK: 

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

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   OK	A
   NG (for 2AZ-FE)	B
   NG (for 2ZR-FE)	C

   B: REPLACE ECM (for 2AZ-FE)  (See REMOVAL )

   C: REPLACE ECM (for 2ZR-FE)  (See REMOVAL )

   A: Go to Next Step 

5. REPLACE COMBINATION METER 
   1. Replace the combination meter with a new or known good one (See COMBINATION METER ).

      OK: 

      The operation of the combination meter returns to normal  .

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   OK	A
   NG (for 2AZ-FE)	B
   NG (for 2ZR-FE)	C

   B: REPLACE ECM (for 2AZ-FE)  (See REMOVAL )

   C: REPLACE ECM (for 2ZR-FE)  (See REMOVAL )

   A: END