Nissan Qashqai (2007-2010). Manual - part 455

P0115 ECT SENSOR

EC-1339

< COMPONENT DIAGNOSIS >

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P0115 ECT SENSOR

Description

INFOID:0000000001089056

The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies
a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature
input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance
of the thermistor decreases as temperature increases.

DTC Logic

INFOID:0000000001115067

DTC DETECTION LOGIC

NOTE:
• Conditions for applying the diagnostic procedure to the stored DTCs:

 The DTC is declared present after the ignition has been switched on for at least 10 seconds.

• If the DTC is present:
- Cooling fan motor is always operate.
- Air conditioner is not operate.

Diagnosis Procedure

INFOID:0000000001089006

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Check ground connection E17. Refer to Ground inspection in 

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK ENGINE COOLANT TEMPERATURE SENSOR SUPPLY CIRCUIT

1.

Disconnect engine coolant temperature sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between engine coolant temperature sensor connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

3.

CHECK ENGINE COOLANT TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between engine coolant temperature sensor harness connector and ECM harness
connector.

DTC No.

Trouble diagnosis name

Possible cause

P0115

ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT
• CC.0: Short circuit to ground
• CO.1: Open circuit or short circuit to +12V
• 1.DEF: Micro-breaks
• 2.DEF: Signal incoherence

• Harness or connectors

(Engine coolant temperature sensor cir-
cuit is open or shorted.)

• Engine coolant temperature sensor

Engine coolant temperature sensor

Ground

Voltage

Connector

Terminal

F79

3

Ground

Approx. 5V

Engine coolant temperature sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F79

2

F85

33

Existed

EC-1340

< COMPONENT DIAGNOSIS >

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P0115 ECT SENSOR

4.

Also check harness for short to ground and short to power. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK ENGINE COOLANT TEMPERATURE SENSOR 

Refer to 

EC-1344, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace engine coolant temperature sensor.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001089007

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check resistance between engine coolant temperature sensor terminals 2 and 3 under the following condi-
tions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace Engine coolant temperature sensor.

Terminal

Condition

Resistance (

Ω

)

2 and 3

25

°

C (77

°

F)

2,252 

±

 112.16

50

°

C (112

°

F)

810 

±

 39

80

°

C (176

°

F)

283 

±

 8

P0120 ELECTRIC THROTTLE CONTROL ACTUATOR

EC-1341

< COMPONENT DIAGNOSIS >

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P0120 ELECTRIC THROTTLE CONTROL ACTUATOR

Description

INFOID:0000000000970739

By default the valve is open when in the rest position and is actuated only when the engine is stopped; this has
a damping effect and helps to stop the engine.

DTC Logic

INFOID:0000000001115068

DTC DETECTION LOGIC

NOTE:
• The electric throttle control actuator function is no longer ensured when the engine is stopped or the valve is

closed, then the engine stalls or starting is impossible.

Diagnosis Procedure

INFOID:0000000000970741

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

 Check ground connection E17. Refer to Ground inspection in 

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect electric throttle control actuator harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between electric throttle control actuator harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• IPDM E/R 
• Harness connector E7, F121
• Harness for open or short between IPDM E/R and electric throttle control actuator
• Harness for open or short between ECM and electric throttle control actuator

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

DTC No.

Trouble diagnosis name

Possible cause

P0120

ELECTRIC THROTTLE CONTROL ACTUATOR CIRCUIT
• CC.0: Short circuit to ground
• CC.1: Short circuit to +12V
• CO: Open circuit

• Harness or connectors

(Electric throttle control actuator circuit is 
open or shorted.)

• Throttle position sensor
• Throttle control motor

Electric throttle control actua-

tor

Ground

Voltage

Connector

Terminal

F81

1

Ground

Battery voltage

EC-1342

< COMPONENT DIAGNOSIS >

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P0120 ELECTRIC THROTTLE CONTROL ACTUATOR

3.

Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

4.

Also check harness for short to ground and short to power. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace electric throttle control actuator.

NO

>> Repair or replace.

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F81

5

F68

72

Existed

2

94

4

90