METER / GAUGE SYSTEM Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine coolant temperature signals from the ECM. The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

except 5L-E

*1	Combination Meter Assembly
*2	CAN Communication Line

for 5L-E

*1	THWO
*2	TEMP
*3	Combination Meter Assembly

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK ENGINE TYPE

   
   

   1. Check the engine type.

      Result

      Result	Proceed to
      except 5L-E	A
      for 5L-E	B

   
   

   B

   PERFORM ACTIVE TEST USING GTS (WATER TEMPERATURE METER OPERATION) Click here

   A

2. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if a CAN communication DTC is output.

      
      

      1. for LHD with Entry and Start System Click here.

      2. for LHD without Entry and Start System Click here.

      3. for RHD with Entry and Start System Click here.

      4. for RHD without Entry and Start System Click here.

         Result

         Result	Proceed to
         CAN communication DTC is not output.	A
         CAN communication DTC is output. (for LHD with Entry and Start System)	B
         CAN communication DTC is output. (for LHD without Entry and Start System)	C
         CAN communication DTC is output. (for RHD with Entry and Start System)	D
         CAN communication DTC is output. (for RHD without Entry and Start System)	E

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   C

   GO TO CAN COMMUNICATION SYSTEM Click here

   D

   GO TO CAN COMMUNICATION SYSTEM Click here

   E

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

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

   
   

   1. Using the GTS, perform the Active Test Click here.

      Combination Meter

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Water Temperature Meter Operation	Engine coolant temperature receiver gauge	OFF, 45, 60, 70, 80, Middle, 110, 120, 127	-

      OK
      Engine coolant temperature receiver gauge indication is normal.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

4. 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

5. READ VALUE USING GTS (COOLANT TEMP)

   
   

   1. Using the GTS, read the Data List 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 the engine	-

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

      Result

      Result	Proceed to
      OK	A
      NG (for 1GR-FE)	B
      NG (for 2TR-FE)	C
      NG (for 1KD-FTV)	D
      NG (for 1GD-FTV)	E

   
   

   A

   REPLACE COMBINATION METER ASSEMBLY Click here

   B

   REPLACE ECM Click here

   C

   REPLACE ECM Click here

   D

   REPLACE ECM Click here

   E

   REPLACE ECM Click here

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

   
   

   1. Using the GTS, perform the Active Test Click here.

      Combination Meter

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Water Temperature Meter Operation	Engine coolant temperature receiver gauge	LOW, 60, 70, 80, Normal, 110, 120, HIGH	-

      OK
      Engine coolant temperature receiver gauge indication is normal.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

7. 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

8. READ VALUE USING GTS (COOLANT TEMP)

   
   

   1. Using the GTS, read the Data List 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 the engine	-

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

   
   

   NG

   REPLACE ECM Click here

   OK

9. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

   
   

   1. Disconnect the G6 combination meter assembly connector.

   2. Disconnect the G183 ECM connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition G6-35 (TEMP) - G183-12 (THWO) Always Below 1 Ω G6-35 (TEMP) or G183-12 (THWO) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

10. CHECK COMBINATION METER ASSEMBLY

    
    

    1. Replace the combination meter assembly Click here.

    2. Check that the operation of the engine coolant temperature receiver gauge returns to normal.

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

    
    

    OK

    END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE ECM Click here