METER / GAUGE SYSTEM Engine Coolant Temperature 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	Combination Meter Assembly
*2	CAN Communication Line

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Check for DTCs.

      for LHD without Central Gateway ECU: Click here

      for RHD without Central Gateway ECU: Click here

      for LHD with Central Gateway ECU: Click here

      for RHD with Central Gateway ECU: Click here

      OK
      No DTCs are output.

      Result
      Result Proceed to OK (for Diesel Engine) A OK (for Gasoline Engine) B NG C

   
   

   B

   CHECK FOR DTC (SFI SYSTEM) Click here

   C

   GO TO CAN COMMUNICATION SYSTEM for LHD without Central Gateway ECU: Click here GO TO CAN COMMUNICATION SYSTEM for RHD without Central Gateway ECU: Click here GO TO CAN COMMUNICATION SYSTEM for LHD with Central Gateway ECU: Click here GO TO CAN COMMUNICATION SYSTEM for RHD with Central Gateway ECU: Click here

   A

2. CHECK FOR DTC (ECD SYSTEM)

   
   

   1. Check for DTCs.

      for 1GD-FTV: Click here

      for 1GD-FTV, w/ DPF: Click here

      for 2GD-FTV: Click here

      for 2GD-FTV, w/ DPF: Click here

      for 2GD-FTV, w/ Urea SCR System: Click here

      for 1KD-FTV: Click here

      for 2KD-FTV: Click here

      for 5L-E: Click here

      
      Powertrain > Engine > Trouble Codes

      OK
      No DTCs are output.

      Result
      Proceed to OK NG

   
   

   NG

   GO TO ECD SYSTEM for 1GD-FTV: Click here GO TO ECD SYSTEM for 1GD-FTV, w/ DPF: Click here GO TO ECD SYSTEM for 2GD-FTV: Click here GO TO ECD SYSTEM for 2GD-FTV, w/ DPF: Click here GO TO ECD SYSTEM for 2GD-FTV, w/ Urea SCR System: Click here GO TO ECD SYSTEM for 1KD-FTV: Click here GO TO ECD SYSTEM for 2KD-FTV: Click here GO TO ECD SYSTEM for 5L-E: Click here

   OK

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

   
   

   1. Using the GTS, perform the Active Test.

      Click here

      
      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

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

   
   

   1. Using the GTS, read the Data List.

      Click here

      
      Powertrain > Engine > Data List

      Tester Display	Measurement Item	Normal Condition	Reference Value	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	-

      
      Body Electrical > Combination Meter > Data List

      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	-

      
      Body Electrical > Combination Meter > Data List

      Tester Display
      Coolant Temperature

      
      Powertrain > Engine > Data List

      Tester Display
      Coolant Temp

      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.

      OK
      The Data List values of the ECUs do not match.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE ECM for 1GR-FE: Click here REPLACE ECM for 1TR-FE: Click here REPLACE ECM for 2TR-FE: Click here REPLACE ECM for 1GD-FTV: Click here REPLACE ECM for 2GD-FTV: Click here REPLACE ECM for 1KD-FTV: Click here REPLACE ECM for 2KD-FTV: Click here REPLACE ECM for 5L-E: Click here

   OK

5. CHECK COMBINATION METER ASSEMBLY

   
   

   1. Replace the combination meter assembly with a new one.

      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.

      Result
      Proceed to OK NG

   
   

   OK

   END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

   NG

   REPLACE ECM for 1GR-FE: Click here REPLACE ECM for 1TR-FE: Click here REPLACE ECM for 2TR-FE: Click here REPLACE ECM for 1GD-FTV: Click here REPLACE ECM for 2GD-FTV: Click here REPLACE ECM for 1KD-FTV: Click here REPLACE ECM for 2KD-FTV: Click here REPLACE ECM for 5L-E: Click here

6. CHECK FOR DTC (SFI SYSTEM)

   
   

   1. Check for DTCs.

      for 1TR-FE: Click here

      for 2TR-FE: Click here

      for 1GR-FE: Click here

      
      Powertrain > Engine > Trouble Codes

      OK
      No DTCs are output.

      Result
      Proceed to OK NG

   
   

   OK

   GO TO STEP 3 Click here

   NG

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