METER / GAUGE SYSTEM Engine Coolant Temperature Gauge Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine coolant temperature signals from the ECM using CAN communication lines. The combination meter assembly displays an engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

*1	Combination Meter Assembly
*2	CAN Communication Line

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Check for DTCs Click here.

      Result

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

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

2. PERFORM ACTIVE TEST USING GTS (ENGINE COOLANT TEMP)

   
   

   1. Use the Active Test to check the operation of the engine coolant temperature receiver gauge Click here.

      Combination Meter

      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 the engine idling.

      Tech Tips

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

      OK
      Needle indication is normal.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

3. READ VALUE USING GTS (COOLANT TEMPERATURE)

   
   

   1. Using the GTS, read the Data List Click here.

      Combination Meter

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

      OK
      Coolant temperature displayed on the GTS is between 75°C (167°F) and 100°C (212°F) after warming up.

   
   

   OK

   REPLACE COMBINATION METER ASSEMBLY Click here

   NG

4. READ VALUE USING GTS (ENGINE COOLANT TEMPERATURE)

   
   

   1. Using the GTS, read the Data List Click here.

      Engine

      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 the engine	-

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

      Tech Tips

      
      

      • for 1ZR-FAE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here

      • for 2ZR-FAE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here

      • for 3ZR-FE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here

      • for 3ZR-FAE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here

   
   

   NG

   GO TO SFI SYSTEM

   OK

5. REPLACE COMBINATION METER ASSEMBLY

   
   

   1. Temporarily replace the combination meter with a new one or normally functioning Click here.

   
   

   NEXT

6. CHECK COMBINATION METER ASSEMBLY

   
   

   1. Check that the operation of the combination meter returns to normal Click here.

      OK
      Operation of combination meter returns to normal.

      Tech Tips

      
      

      • for 1ZR-FAE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.

      • for 2ZR-FAE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.

      • for 3ZR-FE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.

      • for 3ZR-FAE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.

   
   

   OK

   END (COMBINATION METER IS DEFECTIVE)

   NG

   REPLACE ECM