Malfunction in Water Temperature Warning Light: Procedure

1. Check if a CAN communication DTC is output. Refer to DIAGNOSIS SYSTEM .

   Result

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

B → See step   7 

A: Go to next step 

1. Check the water temperature warning light.

   Result

   Result	Proceed to
   Water temperature warning light does not come on.	A
   Water temperature warning light remains on.	B

B → See step   4 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
5. Check the operation by referring to the table below.
   COMBINATION METER
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Indicator. Lamp Coolant Hot	Coolant temperature hot warning light	OFF or ON	Confirm that the vehicle is stopped with the engine idling

   Result

   Result	Proceed to
   Coolant temperature hot warning light operation is not normal.	A
   Coolant temperature hot warning light operation is normal.	B

B → See step   5 

A: Go to next step 

1. Check for DTCs. Refer to DTC CHECK / CLEAR for SFI system. Refer to DTC CHECK / CLEAR for meter/gauge system).

   Result

   Result	Proceed to
   DTCs are not output.	A
   SFI system DTCs are output.	B
   DTC B1503 is output.	C

B → See step   8 

C → See step   9 

A: Go to next step 

1. Set the vehicle in maintenance mode using the Techstream. Refer to INSPECTION MODE PROCEDURE .
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus:
   1. for Combination Meter: Body Electrical / Combination Meter / Data List.
   2. for Engine: Powertrain / Engine and ECT / Data List.
6. Check the values by referring to the table below.
   COMBINATION METER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Coolant Temperature	Engine coolant temperature/-40 to 127.5°C (-40 to 261.5°F)	After warming up: 80 to 100°C (176 to 212°F)	-

7. Check the values by referring to the table below.
   ENGINE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Stored as Freeze Frame Data
   Coolant Temp	Engine coolant temperature/ Min.: -40°C (-40°F), Max.: 140°C (284°F)	80 to 100°C (176 to 212°F): After warming up	Yes
   	Diagnostic Note: This is the engine coolant temperature. HINT:  After warming up the engine, the engine coolant temperature is 80 to 100°C (176 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 may be open or shorted. Check if the engine overheats when the value indicates higher than 135°C (275°F).

   Result

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

   HINT: 

   When the Data List values of the ECUs do not match, a signal output error of the ECM is suspected.

NG → See step   10 

OK: Go to next step 

1. Replace the No. 3 meter circuit plate with a new or a known good one. Refer to DISASSEMBLY .

   OK

   The operation of the water temperature warning light returns to normal.

NG → See step   10 

OK → END