DTC    P0117    Engine Coolant Temperature Circuit Low Input

DTC    P0118    Engine Coolant Temperature Circuit High Input

for Preparation Click here


DESCRIPTION

A thermistor is built into the Engine Coolant Temperature (ECT) sensor and it changes its resistance value according to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as the intake air temperature sensor.

HINT:
  1. When the engine coolant temperature sensor output is outside the normal range, the ECM determines that this is a malfunction.
  2. If DTC P0117 or P0118 is detected, the ECM performs engine control using an estimated engine coolant temperature calculated from the intake air temperature and the intake air volume at the time of engine start.


P0117 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine idles for approximately 15 seconds
Engine coolant temperature sensor output is more than 120°C (248°F).
(1 trip detection logic.)
  1. Short in engine coolant temperature sensor circuit
  2. Engine coolant temperature sensor
  3. ECM

P0118 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine idles for approximately 15 seconds
Engine coolant temperature sensor output is less than -30°C (-22°F).
(1 trip detection logic.)
  1. Open in engine coolant temperature sensor circuit
  2. Engine coolant temperature sensor
  3. ECM

Related Data List 
DTC No.
Data List
P0117
  1. Coolant Temp
P0118

HINT:
  1. If DTC P0117 or P0118 is stored, the following symptoms may appear:
    1. Misfire
    2. Combustion noise
    3. Black smoke
    4. White smoke
    5. Lack of power
  2. When DTC P0117 or P0118 is stored, check the engine coolant temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Coolant Temp.


Reference 
Temperature Displayed
Malfunction
-30°C (-22°F)
Open circuit
120°C (248°F)
Short circuit

WIRING DIAGRAM


A199002E02


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the ECM, the ECM needs Registration and Initialization (Click here).

HINT:
  1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

1.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

  1. Read the value.

    Standard:
    80 to 100°C (176 to 212°F) with warm engine.

    Result 
    Result
    		Proceed to
    -30°C (-22°F)
    		A
    120°C (248°F) or higher
    		B
    Between 80 to 100°C (176 to 212°F)
    		C

    HINT:
    1. If there is an open circuit, the intelligent tester indicates -30°C (-22°F).
    2. If there is a short circuit, the intelligent tester indicates 120°C (248°F) or higher.



B
Go to step 4

C
Go to step 11
A


2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)

  1. Disconnect the engine coolant temperature sensor connector.



    A199017E01

  1. Connect terminals 1 and 2 of the ECT sensor on the wire harness side.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

  1. Read the value.

    Standard:
    120°C (248°F) or higher

    Text in Illustration 
    *1
    		Engine Coolant Temperature Sensor
    *2
    		Front view of wire harness connector
    (to Engine Coolant Temperature Sensor)

  1. Reconnect the engine coolant temperature sensor connector.



OK
Go to step 7

NG
Go to step 3

3.CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

  1. Disconnect the engine coolant temperature sensor connector.



    A199018E01

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B38-2 - B9-40 (THW)
    		Always
    		Below 1 Ω
    B38-1 - B9-39 (ETHW)
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Engine Coolant Temperature Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the engine coolant temperature sensor connector.

  1. Reconnect the ECM connector.



OK
Go to step 9

NG
Go to step 8

4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)

  1. Disconnect the engine coolant temperature sensor connector.



    A200307E02

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

  1. Read the value.

    Standard:
    -30°C (-22°F)

    Text in Illustration 
    *1
    		Engine Coolant Temperature Sensor

  1. Reconnect the engine coolant temperature sensor connector.



OK
Go to step 10

NG
Go to step 5

5.CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

  1. Disconnect the engine coolant temperature sensor connector.



    A199018E02

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B38-2 or B9-40 (THW) - Body ground)
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Engine Coolant Temperature Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the engine coolant temperature sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


6.REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 11

7.CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR

  1. Replace the engine coolant temperature sensor (Click here).



NEXT
Go to step 11

8.REPAIR OR REPLACE HARNESS OR CONNECTOR


NEXT
Go to step 11

9.CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 11

10.REPLACE ENGINE COOLANT TEMPERATURE SENSOR

  1. Replace the engine coolant temperature sensor (Click here).


NEXT


11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.


NEXT

END