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

READ VALUE USING TECHSTREAM (COOLANT TEMP)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

Read the value displayed on the Techstream.

Standard

Same as actual engine coolant temperature.

Result

Temperature Displayed	Proceed to
-40°C (-40°F)	A
140°C (284°F) or more	B
Same as actual engine coolant temperature	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 more.

B → See step 4

C → See step 6

A: Go to next step

READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN SENSOR)
1. Disconnect the engine coolant temperature sensor connector.
  
  Fig 1: Identifying Engine Coolant Temperature Circuit & Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 engine switch on (IG).
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
7. Read the value displayed on the Techstream.
  Standard
  
  140°C (284°F) or more
8. Reconnect the engine coolant temperature sensor connector.
NG → See step 3

OK → See step 7
READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM)
1. Disconnect the engine coolant temperature sensor connector.
  
  Fig 2: Identifying Engine Coolant Temperature Circuit & ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect terminals THW and E2 of the ECM connector.
  HINT:
  
  Before checking, do visual and contact pressure checks on the ECM connector.
3. Connect the Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
7. Read the value displayed on the Techstream.
  Standard
  
  140°C (284°F) or more
8. Reconnect the engine coolant temperature sensor connector.
NG → See step 8

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR
READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN SENSOR)
1. Disconnect the engine coolant temperature sensor connector.
  
  Fig 3: Identifying Engine Coolant Temperature Sensor And ECM Circuit
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 9
READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM)
1. Disconnect the ECM connector.
  
  Fig 4: Identifying Engine Coolant Temperature Sensor And ECM Circuit With ECM Connectors Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the engine coolant temperature sensor connector.
3. Connect the Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
7. Read the value displayed on the Techstream.
  Standard
  
  -40°C (-40°F)
8. Reconnect the engine coolant temperature sensor connector.
9. Reconnect the ECM connector.
NG → See step 10

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to REMOVAL
REPLACE ECM. Refer to REMOVAL
REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to REMOVAL
REPLACE ECM. Refer to REMOVAL