Malfunction in Water Temperature Warning Light [11/2015 - ]: Procedure

1. Check if CAN communication DTCs are output (Refer to DIAGNOSIS SYSTEM [11/2015 - 06/2017] Refer to DIAGNOSIS SYSTEM [06/2017 - ] w/ Toyota Safety Sense C. Refer to DIAGNOSIS SYSTEM [11/2015 - ] w/o Toyota Safety Sense C).

   Result

   Result	Proceed to
   CAN communication DTCs are not output.	A
   CAN communication DTCs are output (w/ Toyota Safety Sense C).	B
   CAN communication DTCs are output (w/o Toyota Safety Sense C).	C

Result: 

B 

REFER TO CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

Result: 

C 

REFER TO CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

Result: 

A 

See step  2

1. Check for DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] for SFI System. Refer to DTC CHECK / CLEAR [11/2015 - ] for Meter/Gauge System).

   Result

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

Result: 

B 

REFER TO SFI SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

Result: 

C 

REFER TO METER / GAUGE SYSTEM 

Refer to DTC B1503: Exhaust Heat Management Warning Detected [11/2015 - ] )

Result: 

A 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to 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 and ECT / 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 / 0 to 127.5°C (0 to 261.5°F)	After warming up: 75 to 100°C (167 to 212°F)	-

   ENGINE AND ECT
   
   

   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)	75 to 100°C (167 to 212°F): After warming up	Stored as Freeze Frame Data Stored as Freeze Frame Data This is the engine coolant temperature
   	Diagnostic Note: This is the engine coolant temperature. HINT:  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 may be open or shorted. Check if the engine overheats when the value indicates higher than 135°C (275°F).

   NOTE:

   Enter inspection mode (Refer to INSPECTION MODE PROCEDURE [11/2015 - ] ).

   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.

Result: 

B 

REFER TO SFI SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

Result: 

A 

See step  4

1. Replace the combination meter assembly with a new or a known good one (Refer to REMOVAL [11/2015 - ] ).

   OK

   The operation of the water temperature warning returns to normal.

Result: 

OK 

END 

Result: 

NG 

REPLACE ECM 

Refer to REMOVAL [11/2015 - ] )