Nissan Pathfinder (2011 year). Instruction — part 259
EC-126
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0112, P0113 IAT SENSOR
P0112, P0113 IAT SENSOR
Component Description
INFOID:0000000006243814
The intake air temperature sensor is built-into the mass air flow sen-
sor (1). The sensor detects intake air temperature and transmits a
signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the rise in temperature.
<Reference data>
*: This data is reference value and is measured between ECM terminal 34 (Intake air
temperature sensor) and ground.
CAUTION:
Never use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic
INFOID:0000000006243815
DTC Confirmation Procedure
INFOID:0000000006243816
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.
Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and wait at least 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000006243817
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
PBIA9559J
Intake air temperature
°
C (
°
F)
Voltage* V
Resistance k
Ω
25 (77)
3.3
1.800 - 2.200
80 (176)
1.2
0.283 - 0.359
SEF012P
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P0112
0112
Intake air tempera-
ture sensor circuit
low input
An excessively low voltage from the sensor is
sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Intake air temperature sensor
P0113
0113
Intake air tempera-
ture sensor circuit
high input
An excessively high voltage from the sensor is
sent to ECM.
2011 Pathfinder
P0112, P0113 IAT SENSOR
EC-127
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow sensor (intake air temperature sensor
is built-in) harness connector.
2. Turn ignition switch ON.
3. Check voltage between mass air flow sensor terminal 5 and
ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connectors.
3.
CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 67.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-128, "Component Inspection"
OK or NG
OK
>> GO TO 5.
NG
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
BBIA0539E
BBIA0541E
Voltage: Approximately 5V
PBIB1169E
Continuity should exist.
2011 Pathfinder
EC-128
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0112, P0113 IAT SENSOR
5.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
>>
INSPECTION END
Component Inspection
INFOID:0000000006243818
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between mass air flow sensor (1) terminals 5
and 6 under the following conditions.
2. If NG, replace mass air flow sensor (with intake air temperature
sensor). Refer to
EM-26, "Removal and Installation"
.
Intake air temperature
°
C (
°
F)
Resistance k
Ω
25 (77)
1.800 - 2.200
PBIA9559J
SEF012P
2011 Pathfinder
P0116 ECT SENSOR
EC-129
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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P0116 ECT SENSOR
Component Description
INFOID:0000000006243819
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 ther-
mistor decreases as temperature increases.
<Reference data>
*: This data is reference value and is measured between ECM terminal 73 (Engine
coolant temperature sensor) and 67 (Sensor ground).
CAUTION:
Never use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic
INFOID:0000000006243820
DTC Confirmation Procedure
INFOID:0000000006243821
1.
INSPECTION START
Is it necessary to erase permanent DTC?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-130, "Component Function Check"
.
NOTE:
Use the component function check to check the overall function of the ECT sensor circut. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
SEF594K
Engine coolant
temperature
°
C (
°
F)]
Voltage* (V)
Resistance (k
Ω
)
−
10 (14)
4.4
7.0 - 11.4
20 (68)
3.5
2.1 - 2.9
50 (122)
2.2
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
SEF012P
DTC No.
Trouble diagnosis
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0116
ECT SEN/CIRC
[Engine coolant temperature
(ECT) sensor circuit range/per-
formance]
The comparison result of signals transmitted
to ECM from each temperature sensor (IAT
sensor, ECT sensor, and FTT sensor) shows
that the voltage signal of the ECT sensor is
higher/lower than that of other temperature
sensors when the engine is started with its
cold state.
• Harness or connectors
(High or low resistance in the ECT
sensor circuit)
• ECT sensor
2011 Pathfinder
EC-130
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0116 ECT SENSOR
YES
>> INSPECTION END
NO
>> Proceed to
.
3.
PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
•
Before performing the following procedure, do not add fuel.
•
Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
•
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 60 minutes.
2. Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between
−
10
°
C (14
°
F) and 35
°
C (95
°
F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4. Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Component Function Check
INFOID:0000000006709487
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor. Refer to
CO-31, "Removal and Installation"
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Proceed to
.
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-37, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Terminals
Condition
Resistance (k
Ω
)
1 and 2
Temperature [
°
C (
°
F)]
20 (68)
2.10 – 2.90
50 (122)
0.68 – 1.00
90 (194)
0.236 – 0.260
JMBIA0080ZZ
2011 Pathfinder
P0116 ECT SENSOR
EC-131
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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Diagnosis Procedure
INFOID:0000000006243822
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
Check ECT sensor. Refer to
EC-131, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace ECT sensor. Refer to
CO-31, "Removal and Installation"
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-37, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000006243823
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.
2. If NG, replace engine coolant temperature sensor. Refer to
31, "Removal and Installation"
PBIB2005E
Engine coolant temperature
°
C (
°
F)]
Resistance (k
Ω
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
SEF012P
2011 Pathfinder
EC-132
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0117, P0118 ECT SENSOR
P0117, P0118 ECT SENSOR
Component Description
INFOID:0000000006243824
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 ther-
mistor decreases as temperature increases.
<Reference data>
*: This data is reference value and is measured between ECM terminal 73 (Engine
coolant temperature sensor) and ground.
CAUTION:
Never use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic
INFOID:0000000006243825
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL illuminate.
SEF594K
Engine coolant temperature
°
C (
°
F)
Voltage* V
Resistance k
Ω
-10 (14)
4.4
7.0 - 11.4
20 (68)
3.5
2.1 - 2.9
50 (122)
2.2
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
SEF012P
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P0117
0117
Engine coolant tem-
perature sensor cir-
cuit low input
An excessively low voltage from the sensor is
sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Engine coolant temperature sensor
P0118
0118
Engine coolant tem-
perature sensor cir-
cuit high input
An excessively high voltage from the sensor is
sent to ECM.
2011 Pathfinder
P0117, P0118 ECT SENSOR
EC-133
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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EC
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DTC Confirmation Procedure
INFOID:0000000006243826
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and wait at least 5 seconds.
3. Check DTC.
4. If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000006243827
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine coolant temperature (ECT) sensor harness
connector.
2. Turn ignition switch ON.
Detected items
Engine operating condition in fail-safe mode
Engine coolant temper-
ature sensor circuit
Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT-III displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT-III display)
Just as ignition switch is turned ON or START
40
°
C (104
°
F)
Approx. 4 minutes or more after engine starting
80
°
C (176
°
F)
Except as shown above
40 - 80
°
C (104 - 176
°
F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while
engine is running.
BBIA0539E
BBIA0542E
2011 Pathfinder
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