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

Read the value displayed on the Techstream.

Standard

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

Result

Temperature Displayed	Proceed to
-40°C (-40°F)	A
140°C (284°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 140°C (284°F).

B → See step 4

C → See step 6

A: Go to next step

CHECK ENGINE COOLANT TEMPERATURE SENSOR (CHECK FOR OPEN IN SENSOR)
1. Confirm good connection at the Engine Coolant Temperature (ECT) sensor.
  
  Fig 1: Checking Engine Coolant Temperature Sensor (Check For Open In Sensor)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E40 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 / All Data / Coolant Temp.
8. Read the value displayed on the Techstream.
  Standard
  
  140°C (284°F).
9. Reconnect the ECT sensor connector.
OK → See step 7

NG: Go to next step
CHECK ECM (CHECK FOR OPEN IN ECM)
1. Disconnect the E40 ECT sensor connector.
  
  Fig 2: Checking ECM (Check For Open In ECM)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect terminals THW and E2 of the E3 and E5 ECM connectors.
  HINT:
  
  Before checking, do visual and contact pressure checks on the ECM connector.
3. Connect 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 / All Data / Coolant Temp.
7. Read the value displayed on the Techstream.
  Standard
  
  140°C (284°F).
8. Reconnect the ECT sensor connector.
OK → REPAIR OR REPLACE HARNESS OR CONNECTOR

NG → See step 8
CHECK ENGINE COOLANT TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR)
1. Disconnect the E40 ECT sensor connector.
  
  Fig 3: Checking Engine Coolant Temperature Sensor (Check For Short In Sensor)
  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 / All Data / Coolant Temp.
6. Read the value displayed on the Techstream.
  Standard
  
  -40°C (-40°F)
7. Reconnect the ECT sensor connector.
OK → See step 9

NG: Go to next step
CHECK ECM (CHECK FOR SHORT IN ECM)
1. Disconnect the E3 and E5 ECM connectors.
  
  Fig 4: Checking ECM (Check For Short In ECM)
  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 / All Data / 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 10
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