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

   Standard value

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

   Result

   Result	Proceed to
   -40°C (-40°F)	A
   More 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, the Techstream indicates -40°C (-40°F).
   • If there is a short circuit, the Techstream indicates more than 135°C (275°F).

B → See step   7 

C → See step   4 

A: Go to next step 

1. Confirm good connection at the engine coolant temperature sensor connector.
   Fig 1: Identifying Value Using Techstream (Check For Open In Wire Harness)

   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 THW and E2 of the engine coolant temperature sensor connector on the wire harness side.
4. Connect the Techstream to the DLC3.
5. Turn the power switch on (IG).
6. Turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
8. Read the value displayed on the Techstream.

   Standard

   More than 135°C (275°F)

NG → See step   3 

OK → See step   5 

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 Open)

   Tester Connection	Condition	Specified Condition
   D6-2 (THW) - D28-64 (THW)	Always	Below 1 Ω
   D6-1 (E2) - D28-65 (ETHW)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6 

1. Disconnect the engine coolant temperature sensor connector.
   Fig 2: Identifying 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 power switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
6. Read the value displayed on the Techstream.

   Standard value

   -40°C (-40°F)

NG → See step   8 

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 (Check for Short)

   Tester Connection	Condition	Specified Condition
   D6-2 (THW) or D28-64 (THW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10