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 DTC is not output.	A
   CAN communication DTC is output.	B

B → See step   7 

A: Go to next step 

1. Check the coolant hot warning light.

   Result

   Result	Proceed to
   Coolant hot warning light does not come on.	A
   Coolant hot 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
   Coolant Hot Indicator	Coolant hot warning light	OFF or ON	Confirm that the vehicle is stopped with the engine idling

   OK

   Coolant hot warning light operation is normal.

NG → See step   8 

OK: Go to next step 

1. Check for the DTC.

   Result

   Result	Proceed to
   No DTC is output.	A
   DTC P0115 is output.	B
   DTC B1503 is output.	C

B → See step   9 

C → See step   10 

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:
   1. for Combination Meter: Body Electrical / Combination Meter / Data List.
   2. for Engine: Powertrain / Engine / Data List.
5. 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)	-

   ENGINE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Coolant Temp	Engine coolant temperature/Min.: -40°C (-40°F), Max.: 215°C (419°F)	After warming up: 80 to 100°C (176 to 212°F)	If -40°C (-40°F): sensor circuit open If 140°C (284°F) or more: sensor circuit shorted

   OK

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

NG → See step   11 

OK: Go to next step 

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

   OK

   The operation of the coolant hot warning light returns to normal.

NG → See step   11 

OK → END