Meter / Gauge System Engine Coolant Temperature Gauge Malfunction

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

PERFORM ACTIVE TEST USING GTS (COOLANT TEMP)

READ VALUE USING GTS (COOLANT TEMPERATURE)

READ VALUE USING GTS (ENGINE COOLANT)

CHECK COMBINATION METER ASSEMBLY

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

If there is an open or short in the engine coolant temperature sensor circuit, an SFI system DTC is output. If output, perform troubleshooting on the SFI system first.

1. Check for DTCs (Click here).
   

   Result

   Result	Proceed to
   CAN communication system DTC is not output	A
   CAN communication system (for LHD with Central Gateway ECU) DTC is output	B
   CAN communication system (for LHD without Central Gateway ECU) DTC is output	C
   CAN communication system (for RHD with Central Gateway ECU) DTC is output	D
   CAN communication system (for RHD without Central Gateway ECU) DTC is output	E

1. Operate the GTS according to the display and select Active Test.
   
   

   Combination Meter

   Tester Display	Test Part	Control Range	Diagnostic Note
   Water Temperature Meter Operation	Engine coolant temperature receiver gauge	LOW, NORMAL or HIGH	Perform the test with the vehicle stopped and engine idling.

   HINT:

   Confirm that the vehicle is stopped and the engine is idling.

   OK:

   Needle indication is normal.
   

1. Operate the GTS according to the display and select Data List.
   
   

   Combination Meter

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Coolant Temperature	Engine coolant temperature/Min.: -40 (-40), Max.: 140 (284)	After warming up: 80 to 105 (176 to 221)	Unit: °C (°F) If the value is -40 (-40): The sensor circuit is open. If the value is 140 (284): The sensor circuit is shorted.

   OK:

   Coolant temperature displayed on the GTS is between 80°C (176°F) and 95°C (203°F) after warming up.
   

   Result

   Result Result	Proceed to
   OK	A
   NG	B

1. Operate the GTS according to the display and select Data List.
   
   

   Engine*1, *2, *3

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Coolant Temp	Engine coolant temperature: Min.: -40°C, Max.: 140°C	80 to 100°C (176 to 212°F): After warming up	If the value is -40°C (-40°F), the sensor circuit is open. If the value is 140°C (284°F), the sensor circuit is shorted.

   
   

   Engine*4

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Coolant Temp	Engine coolant temperature/ Min.: -40°C, Max.: 140°C	After warming up engine: 75 to 90°C (167 to 194°F)	If the value is -40°C (-40°F) or 140°C (284°F), the sensor circuit is open or shorted. After a long soak, the coolant temperature, intake air temperature, and ambient air temperature are approximately equal.

   1. *1: for 1GR-FE
      
   2. *2: for 1UR-FE
      
   3. *3: for 3UR-FE
      
   4. *4: for 1VD-FTV
      

   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 Gasoline)	B
   NG (for Diesel)	C

   HINT:

   *1: Refer to SFI System:

   1. for 1GR-FE (Click here)
      
   2. for 1UR-FE (Click here)
      
   3. for 3UR-FE (Click here)
      

   *2: Refer to ECD System:

   1. for 1VD-FTV (w/ DPF) (Click here)
      
   2. for 1VD-FTV (w/o DPF) (Click here)
      

1. Temporarily replace the combination meter with a new one (Click here).
   

2. Check that the operation of the combination meter returns to normal (Click here).
   

OK:

Operation of combination meter returns to normal.