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
.
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 >
[K9K]
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
EC-1344, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace engine coolant temperature sensor.
5.
CHECK INTERMITTENT INCIDENT
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
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 >
[K9K]
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
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
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