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 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 and 100°C (167 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 → 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: View Of Engine Coolant Temperature Sensor Open Check And Connector Terminals
  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
  
  Higher than 135°C (275°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: View Of ECM Open Check And Connector Terminals
  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
  
  Higher than 135°C (275°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 For Short
  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 For Short
  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