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 engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
5. Read the value displayed on the Techstream.

   Standard

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

   Result

   Result	Proceed to
   Displayed temperature is -40°C (-40°F)	A
   Displayed temperature is higher than 135°C (275°F)	B
   Between 75 to 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 higher than 135°C (275°F).

B → See step   4 

C → See step   6 

A: Go to next step 

1. Confirm good connection at the engine coolant temperature sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

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

2. Disconnect the engine coolant temperature sensor connector.
3. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
4. Connect the Techstream to the DLC3.
5. Turn the engine switch on (IG).
6. Turn the Techstream on.
7. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
8. Read the value displayed on the Techstream.

   Standard

   Higher than 135°C (275°F)

9. Reconnect the engine coolant temperature sensor connector.

NG → See step   3 

OK → See step   7 

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   E40-2 - E5-20 (THW)	Always	Below 1 Ω
   E40-1 - E5-21 (ETHW)	Always	Below 1 Ω

4. Reconnect the engine coolant temperature sensor connector.
5. Reconnect the ECM connectors.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 

OK → See step   8 

1. Disconnect the engine coolant temperature sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Coolant Temperature Sensor
   *2	ECM

2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
6. Read the value displayed on the Techstream.

   Standard

   -40°C (-40°F)

7. Reconnect the engine coolant temperature sensor connector.

NG → See step   5 

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 (Check for Short)

   Tester Connection	Condition	Specified Condition
   E40-2 or E5-20 (THW) - Body ground	Always	10 kΩ or higher

4. Reconnect the engine coolant temperature sensor connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 

OK → See step   8