Dtc P0115 Engine Coolant Temperature Circuit Malfunction

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

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

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

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

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

DTC P0115 Engine Coolant Temperature Circuit Malfunction

DTC P0117 Engine Coolant Temperature Circuit Low Input

DTC P0118 Engine Coolant Temperature Circuit High Input


DESCRIPTION

A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The connection between the engine coolant temperature sensor and the ECM is the same as that of the intake air temperature sensor.

DTC No.
DTC Detection Condition
Trouble Area
P0115
An open or short in the engine coolant temperature sensor circuit for 0.5 seconds (1-trip detection logic).
  1. Open or short in engine coolant temperature sensor circuit
  2. Engine coolant temperature sensor
  3. ECM
P0117
A short in the engine coolant temperature sensor circuit for 0.5 seconds (1-trip detection logic).
  1. Short in engine coolant temperature sensor circuit
  2. Engine coolant temperature sensor
  3. ECM
P0118
An open in the engine coolant temperature sensor circuit for 0.5 seconds (1-trip detection logic).
  1. Open in engine coolant temperature sensor circuit
  2. Engine coolant temperature sensor
  3. ECM
HINT:
When any of these DTCs are output, check the engine coolant temperature using the intelligent tester. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

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

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction


INSPECTION PROCEDURE

HINT:
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, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the value displayed on the tester.

    Result
    Result
    		Proceed to
    Temperature displayed is -40°C (-40°F)
    		A
    Temperature displayed is 140°C (284°F)
    		B
    Temperature displayed is between 80°C and 100°C (176°F and 212°F)
    		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).


B
Go to step 4

C
CHECK FOR INTERMITTENT PROBLEMS (HILUX_TGN26 RM000000PDQ0Q4X.html)
A


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


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction

  1. Confirm that there is a good connection at the engine coolant temperature sensor.

  1. Disconnect the engine coolant temperature sensor connector.

  1. Connect terminals 1 and 2 of the wire harness connector for the engine coolant temperature sensor.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the value displayed on the tester.

    Standard value:
    140°C (284°F)
    Text in Illustration
    *1
    		Engine Coolant Temperature Sensor
    *2
    		ECM
    *a
    		Front view of wire harness connector
    (to Engine Coolant Temperature Sensor)

  1. Reconnect the engine coolant temperature sensor connector.



NG
Go to step 3
OK

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (HILUX_TGN26 RM000000VWA01IX.html)

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

  1. Disconnect the engine coolant temperature sensor connector.

  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
    C17-2 - C95-18 (THW)
    		Always
    		Below 1 Ω
    C17-1 - C95-17 (ETHW)
    		Always
    		Below 1 Ω

  1. Reconnect the engine coolant temperature sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
OK

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)

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


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0115 Engine Coolant Temperature Circuit Malfunction

  1. Disconnect the engine coolant temperature sensor connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the value displayed on the tester.

    Standard value:
    -40°C (-40°F)
    Text in Illustration
    *1
    		Engine Coolant Temperature Sensor
    *2
    		ECM

  1. Reconnect the engine coolant temperature sensor connector.



NG
Go to step 5
OK

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (HILUX_TGN26 RM000000VWA01IX.html)

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

  1. Disconnect the engine coolant temperature sensor connector.

  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
    C17-2 or C95-18 (THW) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the engine coolant temperature sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
OK

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)