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 via the CAN communication system. The combination meter assembly displays the engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

*1	CAN Communication Line
*2	Combination Meter Assembly

CAUTION / NOTICE / HINT

PROCEDURE

1. 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

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

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

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   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.

      
      Body Electrical > Combination Meter > Active Test

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

      
      Body Electrical > Combination Meter > Active Test

      Tester Display
      Water Temperature Meter Operation

      OK
      Engine coolant temperature receiver gauge indication is normal.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

3. READ VALUE USING GTS (COOLANT TEMPERATURE)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

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

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

      
      Body Electrical > Combination Meter > Data List

      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)	75 to 100°C (167 to 212°F): After warming up engine	-

      
      Body Electrical > Combination Meter > Data List

      Tester Display
      Coolant Temperature

      OK
      Engine coolant temperature displayed on the GTS is almost the same as the engine coolant temperature receiver gauge indication.

      Tech Tips

      
      

      • 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.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

4. CHECK FOR DTC

   
   

   1. Check if SFI System DTCs are output.

      for 1AR-FE: Click here

      for 2GR-FE: Click here

      
      Powertrain > Engine > Trouble Codes

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

   
   

   B

   GO TO SFI SYSTEM for 1AR-FE: Click here GO TO SFI SYSTEM for 2GR-FE: Click here

   A

5. READ VALUE USING GTS (COOLANT TEMP, COOLANT TEMPERATURE)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus:

      
      

      1. for Engine: Powertrain / Engine / Data List.

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

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

      
      

      1. Engine

         
         Powertrain > Engine > Data List

         Tester Display	Measurement Item	Range	Normal Condition	Reference Value	Diagnostic Note
         Coolant Temp	Engine coolant temperature	Min.: -40°C (-40°F), Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up engine	-	This is the engine coolant temperature. Tech Tips 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 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats when the value indicates higher than 135°C (275°F).

         
         Powertrain > Engine > Data List

         Tester Display
         Coolant Temp

      2. Combination Meter

         
         Body Electrical > Combination Meter > Data List

         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)	75 to 100°C (167 to 212°F): After warming up engine	-

         
         Body Electrical > Combination Meter > Data List

         Tester Display
         Coolant Temperature

      Result
      Result Proceed to The data list values of the ECUs match. A The data list values of the ECUs do not match. B

      Tech Tips

      
      

      • 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.

   
   

   B

   REPLACE ECM for 1AR-FE: Click here REPLACE ECM for 2GR-FE: Click here

   A

6. REPLACE COMBINATION METER ASSEMBLY

   
   

   1. Replace the combination meter assembly with a new or known good one.

      Click here

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

      Result
      Proceed to OK NG

   
   

   OK

   END

   NG

   REPLACE ECM for 1AR-FE: Click here REPLACE ECM for 2GR-FE: Click here