Dtc P0115/22 Engine Coolant Temperature Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

When using intelligent tester:

READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

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

READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)

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

READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)

When not using intelligent tester:

CHECK ECM (THW VOLTAGE)

INSPECT DIESEL ENGINE COOLANT TEMPERATURE SENSOR

CHECK WIRE HARNESS (ECM - ENGINE COOLANT TEMPERATURE SENSOR)

DTC P0115/22 Engine Coolant Temperature Circuit

DTC P0117/22 Engine Coolant Temperature Circuit Low Input

DTC P0118/22 Engine Coolant Temperature Circuit High Input


DESCRIPTION

A thermistor is built into the Engine Coolant Temperature (ECT) sensor and changes the 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:
If the ECM detects DTC P0115/22, P0117/22 or P0118/22, it operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).

DTC No.
DTC Detection Condition
Trouble Area
P0115/22
Open or short in ECT sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open or short in ECT sensor circuit
  2. ECT sensor
  3. ECM
P0117/22
Short in ECT sensor circuit for 0.5 seconds
(sensor resistance value less than 79 Ω)
P0118/22
Open in ECT sensor circuit for 0.5 seconds
(sensor resistance value more than 156 kΩ)
(1 trip detection logic)

HINT:
When DTC P0115/22, P0117/22 and/or P0118/22 is detected, check the engine coolant temperature by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Coolant Temp.

Temperature Displayed
Malfunction
-40°C (-40°F)
Open circuit
140°C (284°F) or more
Short circuit

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit


INSPECTION PROCEDURE

HINT:
  1. If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.
NOTICE:
If the ECM is replaced, the new ECM needs initialization (Toyota Fortuner RM0000012X2005X.html).

When using intelligent tester:

1.READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Read the values.

    OK:
    75 to 95°C (167 to 203°F) after warming up the engine.
    Result:
    Temperature Displayed
    		Proceed to
    -40°C (-40°F)
    		A
    140°C (284°F) or more
    		B
    OK (Same as actual engine coolant temperature)
    		C
    HINT:
    1. If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
    2. If there is a short circuit, the intelligent tester indicates 140°C (284°F) or more.


B
Go to step 4

C
CHECK FOR INTERMITTENT PROBLEMS
A


2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit

  1. Disconnect the W1 ECT sensor connector.

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Read the values.

    OK:
    Temperature value is 140°C (284°F) or more


OK
CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG


3.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit

  1. Disconnect the W1 ECT sensor connector.

  1. Connect terminals THW and E2 of the E7 ECM connector.

    HINT:
    Before checking, perform a visual and contact pressure check on the ECM connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Read the values.

    OK:
    Temperature value is 140°C (284°F) or more


OK
REPAIR OR REPLACE HARNESS AND CONNECTOR
NG

CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM

4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit

  1. Disconnect the W1 ECT sensor connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Read the values.

    OK:
    Temperature value is -40°C (-40°F)


OK
CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG


5.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit

  1. Disconnect the W1 ECT sensor connector.

  1. Disconnect the E7 ECM connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Read the values.

    OK:
    Temperature value is -40°C (-40°F)


OK
REPAIR OR REPLACE HARNESS AND CONNECTOR
NG

REPLACE ECM


When not using intelligent tester:

1.CHECK ECM (THW VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit

  1. Start the engine.

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E7-19 (THW) -
    E7-28 (E2)
    		Idling, engine coolant temperature between 60 and 120°C (140 and 248°F)
    		0.2 to 1.0 V


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.INSPECT DIESEL ENGINE COOLANT TEMPERATURE SENSOR
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit

  1. Remove the sensor.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Connection
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		2.32 to 2.59 kΩ
    1 - 2
    		80°C (176°F)
    		0.310 to 0.326 kΩ
    NOTICE:
    When checking the ECT sensor in water, keep the terminals dry. After the check, wipe the sensor dry.
    HINT:
    Alternative procedure: Connect an ohmmeter to the installed ECT sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values against the resistance/temperature graph. Change the engine temperature (warm up or allow to cool down) and repeat the test.


NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK


3.CHECK WIRE HARNESS (ECM - ENGINE COOLANT TEMPERATURE SENSOR)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0115/22 Engine Coolant Temperature Circuit

  1. Disconnect the E7 ECM connector.

  1. Disconnect the W1 sensor connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E7-19 (THW) - W1-2 (THW)
    		Below 1 Ω
    E7-28 (E2) - W1-1 (E2)
    		Below 1 Ω
    E7-19 (THW) or W1-2 (THW) - Body ground
    		10 kΩ or higher
    E7-28 (E2) or W1-1 (E2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM