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

WARNING: This page is about a different car, the 2009 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING ENGINE COOLANT TEMPERATURE SENSOR (COOLANT TEMP)

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

Read the value displayed on the tester.

Standard

Between 80°C and 97°C (176°F and 207°F) with warm engine

Result

Temperature Displayed	Proceed to
-40°C (-40°F)	A
140°C (284°F)	B
Between 80°C and 97°C (176°F and 207°F)	C

HINT:

If there is an open circuit, Techstream indicates -40°C (-40°F).
If there is a short circuit, Techstream indicates 140°C (284°F).

C → CHECK FOR INTERMITTENT PROBLEMS

B → See step 4

A: Go to next step

CHECK ENGINE COOLANT TEMPERATURE SENSOR (CHECK FOR OPEN IN SENSOR)
1. Confirm good connection at sensor.
  
  Fig 1: Identifying Connector Terminals
  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 tester on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
8. Read the value displayed on the tester.
  Standard
  
  140°C (284°F)
9. Reconnect the ECT sensor connector.
OK → REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG: Go to next step
CHECK ECM (CHECK FOR OPEN IN ECM)
1. Confirm good connection at ECM.
  
  Fig 2: Identifying Connector
  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 tester on.
7. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
8. Read the value displayed on the tester.
  Standard
  
  140°C (284°F)
9. Reconnect the ECT sensor connector.
OK → REPAIR OR REPLACE HARNESS OR CONNECTOR

NG → REPLACE ECM
CHECK ENGINE COOLANT TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR)
1. Disconnect the E40 ECT sensor connector.
  
  Fig 3: Identifying Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the tester on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
6. Read the value displayed on the tester.
  Standard
  
  -40°C (-40°F)
7. Reconnect the ECT sensor connector.
OK → REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG: Go to next step
CHECK ECM (CHECK FOR SHORT IN ECM)
1. Disconnect the E5 ECM connector.
  
  Fig 4: Identifying Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the tester on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
6. Read the value displayed on the tester.
  Standard
  
  -40°C (-40°F)
7. Reconnect the ECM connector.
OK → REPAIR OR REPLACE HARNESS OR CONNECTOR

NG → REPLACE ECM