NISSAN X-TRAIL 2003 Service Repair Manual

DTC P0101 MAF SENSOR
EC-963
[YD (WITH EURO-OBD)]
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DTC P0101 MAF SENSORPFP:22680
Component DescriptionEBS011OD
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. The mass air flow sensor controls the temperature of the hot
wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor ModeEBS011OE
Specification data are reference values.
ECM Terminals and Reference ValueEBS011OF
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not 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 LogicEBS011OG
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS AIR/FL SE*

Engine: After warming up

Air conditioner switch: OFF

Shift lever: Neutral position

No-loadIdle 1.5 - 2.0V
2,000 rpm 2.2 - 2.7V
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage)
54 W Mass air flow sensor[Engine is running]

Warm-up condition

Idle speed1.8 - 2.3V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm2.5 - 3.0V
67 —Sensor ground
(Sensors shield circuit)[Ignition switch ON]Approximately 0.3V
73 BMass air flow sensor
ground[Ignition switch ON]Approximately 0.3V
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0101
0101Mass air flow sensor cir-
cuit range/performance
problemImproper voltage from the sensor is sent to
ECM compared with the driving condition.

Harness or connectors
(The sensor circuit is open or
shorted.)

Mass air flow sensor

Intake air leaks

Air cleaner

Intake air temperature sensor

Turbocharger boost sensor

EC-964
[YD (WITH EURO-OBD)]
DTC P0101 MAF SENSOR

DTC Confirmation ProcedureEBS011OH
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for at least 40 seconds.
4. Drive vehicle under the following condition.
5. Release accelerator pedal for at least 10 seconds.
Do not depress brake pedal during this procedure.
6. If 1st trip DTC is detected, go to EC-966, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
CKPS·RPM Approx. 2800 rpm
VHCL SPEED SE 70 - 100 km/h
Shift lever 4th position
MBIB1085E

DTC P0101 MAF SENSOR
EC-965
[YD (WITH EURO-OBD)]
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Wiring DiagramEBS011OI
TBWA0565E

EC-966
[YD (WITH EURO-OBD)]
DTC P0101 MAF SENSOR

Diagnostic ProcedureEBS011OJ
1. CHECK INTAKE SYSTEM
1. Check air cleaner for clogging.
2. Check the following for connection and cracks.
–Air duct
–Va c u u m h o s e s
–Intake air passage between air duct and intake manifold
OK or NG
OK >> GO TO 2.
NG >> Reconnect or repair the parts.
2. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws. Refer to EC-943, "
Ground Inspection" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace ground connections.
PBIB2020E

DTC P0101 MAF SENSOR
EC-967
[YD (WITH EURO-OBD)]
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3. CHECK MAFS POWER SUPPLY CIRCUIT
1. Disconnect mass air flow sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between mass air flow sensor terminals 2 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors F30, M63

Harness for open or short between ECM relay and mass air flow sensor

Harness for open or short between mass air flow sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK MAFS 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 3 and ECM terminal 73.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1891E
Voltage: Battery voltage
PBIB1168E
Continuity should exist.

EC-968
[YD (WITH EURO-OBD)]
DTC P0101 MAF SENSOR

6. CHECK MAFS INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between mass air flow sensor terminal 4 and ECM terminal 54. Refer to Wiring
Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK EGR VOLUME CONTROL VALVE FUNCTION
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Remove EGR volume control valve from cylinder head.
3. Turn ignition switch ON.
4. Perform “EGR VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-II. Check that EGR volume control
valve shaft moves smoothly forward and backward according to the valve opening.
NOTE:
When installing the EGR volume control valve, make sure that the shaft is in the same position before
checking.
Without CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Remove EGR volume control valve from cylinder head.
3. Turn ignition switch ON and OFF.
4. Check that EGR volume control valve shaft moves smoothly for-
ward and backward according to the ignition switch position.
NOTE:
When installing the EGR volume control valve, make sure that
the shaft is in the same position before checking.
OK or NG
OK >> GO TO 8.
NG >> Check EGR volume control valve and its circuit. Refer to
EC-1084, "
Diagnostic Procedure" .
8. CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-980, "
Component Inspection" .
OK or NG
OK >> GO TO 9.
NG >> Replace mass sir flow sensor (with intake air temperature sensor).Continuity should exist.
SEF819Y
SEF560W

DTC P0101 MAF SENSOR
EC-969
[YD (WITH EURO-OBD)]
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9. CHECK TURBOCHARGER BOOST SENSOR
Refer to EC-1043, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> Replace turbocharger boost sensor.
10. CHECK MASS AIR FLOW SENSOR
Refer to EC-969, "
Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace mass air flow sensor.
11 . CHECK INTERMITTENT INCIDENT
Refer to EC-936, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS011OK
MASS AIR FLOW SENSOR
1. Reconnect harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 54 (Mass air flow sensor
signal) and ground.
4. If the voltage is out of specification, disconnect MAF sensor har-
ness connector and connect it again.
Then repeat above check.
Removal and InstallationEBS011OL
MASS AIR FLOW SENSOR
Refer to EM-133, "AIR CLEANER AND AIR DUCT" .
Condition Voltage V
Ignition switch ON (Engine stopped.) Approx. 0.7
Idle (Engine is warmed up to normal
operating temperature.)1.8 - 2.3
2,000 rpm (Engine is warmed up to nor-
mal operating temperature.)2.5 - 3.0
SEF865T

EC-970
[YD (WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR

DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionEBS01189
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. The mass air flow sensor controls the temperature of the hot
wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor ModeEBS0118A
Specification data are reference values.
ECM Terminals and Reference ValueEBS0118B
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not 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 LogicEBS0118C
DTC Confirmation ProcedureEBS0118D
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS AIR/FL SE*

Engine: After warming up

Air conditioner switch: OFF

Shift lever: Neutral position

No-loadIdle 1.5 - 2.0V
2,000 rpm 2.2 - 2.7V
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage)
54 W Mass air flow sensor[Engine is running]

Warm-up condition

Idle speed1.8 - 2.3V
[Engine is running]

Warm-up condition

Engine speed is 2,000 rpm2.5 - 3.0V
67 —Sensor ground
(Sensors shield circuit)[Ignition switch ON]Approximately 0.3V
73 BMass air flow sensor
ground[Ignition switch ON]Approximately 0.3V
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0102Mass air flow sensor circuit
low inputAn excessively low voltage from the sensor is
sent to ECM.

Harness or connectors
(The sensor circuit is open or
shorted.)

Mass air flow sensor P0103Mass air flow sensor circuit
high inputAn excessively high voltage from the sensor is
sent to ECM.

DTC P0102, P0103 MAF SENSOR
EC-971
[YD (WITH EURO-OBD)]
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WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to EC-973, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
SEF817Y

EC-972
[YD (WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR

Wiring DiagramEBS0118E
TBWA0565E