DTC P0115: Engine Coolant Temperature Circuit Malfunction; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input [08/2015 - 08/2017]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
5. Read the value displayed on the Techstream.

   Standard value

   Between 80 and 100°C (167 and 212°F) with warm engine.

   RESULT
   
   

   Temperature Displayed	Proceed to
   -40°C (-40°F)	A
   140°C (284°F) or higher	B
   Between 80 and 100°C (176 and 212°F)	C

   HINT: 

   • If there is an open circuit, the Techstream indicates -40°C (-40°F).
   • If there is a short circuit, the Techstream indicates 140°C (284°F) or higher.

Result: 

B 

See step  4

Result: 

C 

CHECK FOR INTERMITTENT PROBLEMS 

(Refer to CHECK FOR INTERMITTENT PROBLEMS [08/2015 - 08/2018] )

Result: 

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the D15 ECT sensor connector.
2. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
7. Read the value displayed on the Techstream.

   Standard value

   140°C (284°F) or higher

   HINT: 

   Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (Refer to INITIALIZATION [08/2015 - 08/2017] ).

Result: 

OK 

CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

(Refer to REMOVAL [08/2015 - 08/2018] )

Result: 

NG 

See step  3

1. Disconnect the D15 ECT sensor connector.
2. Disconnect the D56 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D15-2 - D56-76 (THW)	Always	Below 1 Ω
   D15-1 - D56-98 (ETHA)	Always	Below 1 Ω

Result: 

OK 

GOOD CONNECTION TO ECM. IF OK, REPLACE ECM 

(Refer to REMOVAL [08/2015 - 08/2018] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the D15 ECT sensor connector.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
6. Read the value displayed on the Techstream.

   Standard value

   -40°C (-40°F)

   HINT: 

   Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (Refer to INITIALIZATION [08/2015 - 08/2017] ).

Result: 

OK 

REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

(Refer to REMOVAL [08/2015 - 08/2018] )

Result: 

NG 

See step  5

1. Disconnect the D15 ECT sensor connector.
2. Disconnect the D56 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D15-2 or D56-76 (THW) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - 08/2018] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR