METER / GAUGE SYSTEM Engine Coolant Temperature Gauge Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine coolant temperature signals from the ECM using the CAN communication system. The meter CPU displays the engine coolant temperature, which is calculated based on the data received from the ECM.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if a CAN communication DTC is output.

      
      

      1. for LHD Click here.

      2. for RHD Click here.

         Result

         Result	Proceed to
         CAN communication DTC is not output	A
         CAN communication DTC is output (for LHD)	B
         CAN communication DTC is output (for RHD)	C

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   C

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

2. PERFORM ACTIVE TEST USING GTS (WATER TEMPERATURE METER OPERATION)

   
   

   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	OFF, Low, Normal or High	-

      OK
      Engine coolant temperature receiver gauge indication is normal.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

3. READ VALUE USING GTS (COOLANT TEMPERATURE)

   
   

   1. Use the Data List to check the engine coolant temperature Click here.

      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 GTS is almost the same as the engine coolant temperature receiver gauge indication.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

4. READ VALUE USING GTS (COOLANT TEMP)

   
   

   1. Use the Data List to check the engine coolant temperature Click here.

      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 GTS is almost the same as the previously recorded value displayed on the GTS.

      Result

      Result	Proceed to
      OK	A
      NG (for 2GR-FXE)	B
      NG (for 2AR-FSE [w/ EGR System])	C
      NG (for 2AR-FSE [w/o EGR System])	D

   
   

   B

   GO TO SFI SYSTEM Click here

   C

   GO TO SFI SYSTEM Click here

   D

   GO TO SFI SYSTEM Click here

   A

5. CHECK COMBINATION METER ASSEMBLY

   
   

   1. Replace the combination meter assembly with a new or normally functioning one Click here.

   2. Check the engine coolant temperature gauge operation.

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

      Result

      Result	Proceed to
      OK	A
      NG (for 2GR-FXE)	B
      NG (for 2AR-FSE)	C

   
   

   B

   REPLACE ECM Click here

   C

   REPLACE ECM Click here

   A

   END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)