DTC P0115, P0117, P0118: Engine Coolant Temperature Circuit Malfunction; Engine Coolant Temperature Circuit Low Input; Engine Coolant Temperature Circuit High Input: Procedure

1. Connect 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

   Temperature Displayed	Proceed to
   -40°C (-40°F)	A
   Higher than 135°C (275°F)	B
   Between 75°C and 100°C (167°F and 212°F)	C

   HINT: 

   • If there is an open circuit, Techstream indicates -40°C (-40°F).
   • If there is a short circuit, Techstream indicates higher than 135°C (275°F).

B → See step   4 

C → CHECK FOR INTERMITTENT PROBLEMS 

A: Go to next step 

1. Confirm good connection at sensor.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the E40 Engine Coolant Temperature (ECT) sensor connector.
3. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.
4. Connect 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 ECT sensor connector.

OK → REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

NG: Go to next step 

1. Confirm good connection at ECM.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the E40 ECT sensor connector.
3. Connect terminals THW and ETHW of the E5 ECM connector.

   HINT: 

   Before checking, do visual and contact pressure checks on the ECM connector.

4. Connect 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 ECT sensor connector.

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

NG → See step   6 

1. Disconnect the E40 ECT sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect 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 ECT sensor connector.

OK → REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

NG: Go to next step 

1. Disconnect the E5 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect 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 ECM connector.

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

NG → See step   7