METER / GAUGE SYSTEM Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

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

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if CAN communication DTCs are output (Click here).

      Result
      Result Proceed to CAN communication DTCs are not output. A CAN communication DTCs are output. B

   
   
   • AClick here
   • B

     GO TO CAN COMMUNICATION SYSTEM (Click here)

2. Click here

   PERFORM ACTIVE TEST USING GTS (WATER TEMPERATURE METER OPERATION)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

   5. Check the operation by referring to the table below.

      Table 2. Combination Meter

      Tester Display	Test Part	Control Range	Diagnostic Note
      Water Temperature Meter Operation	Engine coolant temperature receiver gauge	OFF, LOW, NORMAL, HIGH	-

      OK
      Engine coolant temperature receiver gauge indication is normal.

   
   
   • OKClick here
   • NG

     REPLACE COMBINATION METER ASSEMBLY (Click here)

3. Click here

   READ VALUE USING GTS (COOLANT TEMPERATURE)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Combination Meter / Data List.

   5. Set the vehicle in maintenance mode using the GTS (Click here).

   6. Check the values by referring to the table below.

      Table 3. 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 displayed on the GTS is almost the same as the engine coolant temperature receiver gauge indication.

      Tip:
      

      • When the Data List values and engine coolant temperature receiver gauge values match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

      • When the Data List values and engine coolant temperature receiver gauge values do not match, an internal malfunction of the combination meter assembly is suspected.

   
   
   • OKClick here
   • NG

     REPLACE COMBINATION METER ASSEMBLY (Click here)

4. Click here

   CHECK SFI SYSTEM

   
   

   1. Check if SFI system DTCs are output (Click here).

      Result
      Result Proceed to DTCs are not output. A DTCs are output. B

   
   
   • AClick here
   • B

     GO TO SFI SYSTEM (Click here)

5. Click here

   READ VALUE USING GTS (COOLANT TEMPERATURE, COOLANT TEMP)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus:

      
      

      1. for Combination Meter: Body Electrical / Combination Meter / Data List.

      2. for Engine and ECT: Powertrain / Engine and ECT / Data List.

   5. Set the vehicle in maintenance mode using the GTS (Click here).

   6. Check the values by referring to the table below.

      Table 4. 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)	-

      Table 5. Engine and ECT

      Tester Display	Measurement Item/Range	Normal Condition	Stored as Freeze Frame Data
      Coolant Temp	Coolant temperature/Min.: -40°C (-40°F), Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	Yes
      	Diagnostic Note: This is the engine coolant temperature. Tip: After warming up the engine, the engine coolant temperature is 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature are approximately equal. If the value is -40°C (-40°F), or higher than 140°C (284°F), the sensor circuit is open or shorted. Check if the engine overheats when the value indicates 140°C (284°F).

      Result
      Result Proceed to Data List values of the ECUs do not match. A Data List values of the ECUs match. B

      Tip:
      

      • When the Data List values of the ECUs match, an internal malfunction of the ECM is suspected.

      • When the Data List values of the ECUs do not match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

   
   
   • AClick here
   • B

     REPLACE ECM (Click here)

6. Click here

   REPLACE COMBINATION METER ASSEMBLY

   
   

   1. Replace the combination meter assembly with a new one (Click here).

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

   
   
   • OK

     END

   • NG

     REPLACE ECM (Click here)