1Vd-Ftv Engine Control. Dtc P0115 Engine Coolant Temperature Circuit

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:

If DTC P0115, P0117 or P0118 is stored, the ECM operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).

P0115
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 0.5 seconds	Open or short in the engine coolant temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic).	Open or short in engine coolant temperature (ECT) sensor circuit ECT sensor ECM

P0117
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 0.5 seconds	Short in the ECT sensor circuit for 0.5 seconds (1 trip detection logic).	Short in ECT sensor circuit ECT sensor ECM

P0118
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 0.5 seconds	Open in the ECT sensor circuit for 0.5 seconds (1 trip detection logic).	Open in ECT sensor circuit ECT sensor ECM

Related Data List
DTC No.	Data List
P0115	Coolant Temp
P0117
P0118

HINT:

If DTC P0115, P0117and/or P0118 is stored, the following symptoms may appear:

Misfire
Combustion noise
Black smoke
White smoke
Lack of power

When DTC P0115, P0117 and/or P0118 is stored, check the engine coolant temperature by entering the following menus: Powertrain / Engine / Data List / Coolant Temp.

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

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

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Vd-Ftv Engine Control.Ecd System (W/ Dpf).
Dtc
P0115 Engine Coolant Temperature Circuit

INSPECTION PROCEDURE

NOTICE:

After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).

HINT:

If DTCs relating to different systems are stored, and they share terminal E2 as their ground, check this ground circuit first.
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 (ENGINE COOLANT TEMPERATURE)

Connect the intelligent tester to the DLC3.

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

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

Read the value.
OK:
75 to 90°C (167 to 194°F) with warm engine.

Result
Result
Proceed to
-40°C (-40°F)
A
140°C (284°F) or higher
B
75 to 90°C (167 to 194°F)
C
HINT:
1. If there is an open circuit, the tester indicates -40°C (-40°F).
2. If there is a short circuit, the tester indicates 140°C (284°F) or more.

Result
Result	Proceed to
-40°C (-40°F)	A
140°C (284°F) or higher	B
75 to 90°C (167 to 194°F)	C

Go to step 4

Go to step 11

A

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

Disconnect the engine coolant temperature (ECT) sensor connector.

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

Connect the intelligent tester to the DLC3.

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

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

Read the value.
OK:
140°C (284°F) or higher

Go to step 7

Go to step 3

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

Disconnect the ECT sensor connector.

Disconnect the ECM connector.

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

Standard Resistance (Check for Short):
for LHD
Tester Connection
Condition
Specified Condition
C71-2 - C45-76 (THW)
Always
Below 1 Ω
C71-1 - C45-75 (E2)
Always
Below 1 Ω
for RHD
Tester Connection
Condition
Specified Condition
C71-2 - C46-76 (THW)
Always
Below 1 Ω
C71-1 - C46-75 (E2)
Always
Below 1 Ω

for LHD
Tester Connection	Condition	Specified Condition
C71-2 - C45-76 (THW)	Always	Below 1 Ω
C71-1 - C45-75 (E2)	Always	Below 1 Ω

for RHD
Tester Connection	Condition	Specified Condition
C71-2 - C46-76 (THW)	Always	Below 1 Ω
C71-1 - C46-75 (E2)	Always	Below 1 Ω

Go to step 9

Go to step 8

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

Disconnect the ECT sensor connector.

Connect the intelligent tester to the DLC3.

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

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

Read the value.
OK:
-40°C (-40°F)

Go to step 10

Go to step 5

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

Disconnect the ECT sensor connector.

Disconnect the ECM connector.

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

Standard Resistance (Check for Short):
for LHD
Tester Connection
Condition
Specified Condition
C71-2 or C45-76 (THW) - Body ground
Always
10 kΩ or higher
for RHD
Tester Connection
Condition
Specified Condition
C71-2 or C46-76 (THW) - Body ground
Always
10 kΩ or higher

for LHD
Tester Connection	Condition	Specified Condition
C71-2 or C45-76 (THW) - Body ground	Always	10 kΩ or higher

for RHD
Tester Connection	Condition	Specified Condition
C71-2 or C46-76 (THW) - Body ground	Always	10 kΩ or higher

Go to step 8

OK

6.REPLACE ECM

Replace the ECM (Click here).

Go to step 11

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

Replace the engine coolant temperature sensor (Click here).

Go to step 11

8.REPAIR OR REPLACE HARNESS OR CONNECTOR

Go to step 11

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

Replace the ECM (Click here).

Go to step 11

10.REPLACE ENGINE COOLANT TEMPERATURE SENSOR

Replace the engine coolant temperature sensor (Click here).

NEXT

11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON for 1 second.

Enter the following menus: Powertrain / Engine / DTC.

Confirm that the DTC is not output again.

END