Nissan Frontier D22. Manual — part 556
DTC P0101 MAF SENSOR
EC-1327
[VG33ER]
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DTC P0101 MAF SENSOR
PFP:22680
Component Description
UBS00DTB
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. It consists of a hot wire that is supplied with electric current from
the ECM. The temperature of the hot wire is controlled by the ECM 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 ECM must supply more electric current 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 Mode
UBS00DTC
Specification data are reference values.
On Board Diagnosis Logic
UBS00DTD
DTC Confirmation Procedure
UBS00DTE
Perform PROCEDURE FOR MALFUNCTION A first.
If the 1st trip DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
PROCEDURE FOR MALFUNCTION A
NOTE:
If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.
SEF030T
MONITOR ITEM
CONDITION
SPECIFICATION
MAS A/F SE-B1
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Engine: After warming up
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Air conditioner switch: OFF
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Shift lever: N (A/T), Neutral (M/T)
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No load
Idle
1.0 - 1.7V
2,500 rpm
1.7 - 2.3V
CAL/LD VALUE
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Engine: After warming up
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Air conditioner switch: OFF
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Shift lever: N (A/T), Neutral (M/T)
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No load
Idle
18.5 - 26.0%
2,500 rpm
18.0 - 21.0%
MASS AIRFLOW
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Engine: After warming up
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Air conditioner switch: OFF
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Shift lever: N (A/T), Neutral (M/T)
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No load
Idle
3.3 - 4.8 g·m/s
2,500 rpm
12.0 - 14.9 g·m/s
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0101
Mass air flow sensor cir-
cuit range/performance
problem
A)
A high voltage from the sensor is sent to ECM
under light load driving condition.
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Harness or connectors
(The sensor circuit is open or
shorted.)
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Mass air flow sensor
B)
A low voltage from the sensor is sent to ECM
under heavy load driving condition.
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Harness or connectors
(The sensor circuit is open or
shorted.)
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Intake air leaks
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Mass air flow sensor
EC-1328
[VG33ER]
DTC P0101 MAF SENSOR
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and warm it up to normal operating temperature.
4.
Run engine for at least 10 seconds at idle speed.
5.
If 1st trip DTC is detected, go to
With GST
Follow the procedure “With CONSULT-II”.
PROCEDURE FOR MALFUNCTION B
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-II
1.
Turn ignition switch ON.
2.
Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to
EC-1331, "Diagnostic Procedure"
3.
Select “DATA MONITOR” mode with CONSULT-II.
4.
Check the voltage of MAS AIR/FL SE with “DATA MONITOR”.
5.
Increases engine speed to about 4,000 rpm.
6.
Monitor the linear voltage rise in response to engine speed
increases.
If NG, go to
EC-1331, "Diagnostic Procedure"
If OK, go to following step.
SEF174Y
SEF243Y
DTC P0101 MAF SENSOR
EC-1329
[VG33ER]
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7.
Maintain the following conditions for at least 10 consecutive sec-
onds.
8.
If 1st trip DTC is detected, go to
Overall Function Check
UBS00DTF
PROCEDURE FOR MALFUNCTION B
Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip
DTC might not be confirmed.
With GST
1.
Start engine and warm it up to normal operating temperature.
2.
Select MODE 1 with GST.
3.
Check the mass air flow sensor signal with MODE 1.
4.
Check for linear mass air flow sensor signal value rise in
response to increases to about 4,000 rpm in engine speed.
5.
If NG, go to
EC-1331, "Diagnostic Procedure"
ENG SPEED
More than 2,000 rpm
THRTL POS SEN
More than 3V
Selector lever
Suitable position
Driving location
Driving vehicle uphill (Increased engine load) will
help maintain the driving conditions required for
this test.
SEF175Y
SEF534P
EC-1330
[VG33ER]
DTC P0101 MAF SENSOR
Wiring Diagram
UBS00DTG
BBWA0470E
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