DTC P0115: Engine Coolant Temperature Circuit Malfunction; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input: 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 / Data List / All Data / Coolant Temp.
5. Read the value displayed on the Techstream.

   Standard value

   Between 75 and 100°C (167 and 212°F) with warm engine

   RESULT
   
   

   Result	Proceed to
   -40°C (-40°F)	A
   140°C (284°F) or higher	B
   Between 75 and 100°C (167 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.

B → See step   4 

C → See step   6 

A: Go to next step 

Fig 1: Checking Engine Coolant Temperature Sensor/ECM Connection (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the engine coolant temperature sensor connector.
2. Connect terminals 1 and 2 of the engine coolant temperature 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 / Data List / All Data / Coolant Temp.
7. Read the value displayed on the Techstream.

   Standard value

   140°C (284°F) or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   3 

OK → See step   7 

1. Disconnect the engine coolant temperature sensor connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B3-2 - B30-64 (THW)	Always	Below 1 Ω
   B3-1 - B30-65 (ETHW)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

Fig 2: Checking Engine Coolant Temperature Sensor/ECM Connection (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the engine coolant temperature 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 / Data List / All Data / Coolant Temp.
6. Read the value displayed on the Techstream.

   Standard value

   -40°C (-40°F)

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Coolant Temperature Sensor
   *2	ECM

NG → See step   5 

OK → See step   9 

1. Disconnect the engine coolant temperature sensor connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B3-2 or B30-64 (THW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10