DTC P0115-15: Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open [12/2021 - ]: Procedure

Pre-procedure1

• Disconnect the engine coolant temperature sensor connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Engine Coolant Temperature Sensor	*2	ECM
  *a	Front view of wire harness connector (to Engine Coolant Temperature Sensor)	-	-

• Connect terminals 1 (E2) and 2 (THW) of the engine coolant temperature sensor connector on the wire harness side.

• According to the display on the GTS, read the Data List.

  Powertrain > Engine > Data List 

  Tester Display
  Coolant Temperature

  Result

  Result	Proceed to
  The value of Coolant Temperature is more than 135°C	A
  None of the above conditions are met	B

  HINT: 

  135°C (275°F)

Post-procedure1

• None

Result: 

A 

REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

Refer to REMOVAL [12/2021 - ]

HINT: 

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

Refer to INITIALIZATION [12/2021 - ]

Result: 

B 

See step  2

Pre-procedure1

• Disconnect the engine coolant temperature sensor connector.
• Disconnect the ECM connector.

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition
  C28-2 (THW) - C37-125 (THW)	Always	Below 1 Ω
  C28-1 (E2) - C37-126 (ETHW)	Always	Below 1 Ω
  C28-2 (THW) or C37-125 (THW) - Other terminals	Always	10 kΩ or higher

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [12/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR