Nissan Frontier D22. Manual — part 406
DTC P0102, P0103 MAF SENSOR
EC-727
[VG33E]
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DTC P0102, P0103 MAF SENSOR
PFP:22680
Component Description
UBS00DGA
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
UBS00DGB
Specification data are reference values.
On Board Diagnosis Logic
UBS00DGC
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
UBS00DGD
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.
SEF030T
MONITOR ITEM
CONDITION
SPECIFICATION
MAS A/F SE-B1
●
Engine: After warming up
●
Air conditioner switch: OFF
●
Shift lever: N (A/T), Neutral (M/T)
●
No load
Idle
1.0 - 1.7V
2,500 rpm
1.7 - 2.3V
CAL/LD VALUE
●
Engine: After warming up
●
Air conditioner switch: OFF
●
Shift lever: N (A/T), Neutral (M/T)
●
No load
Idle
18.5 - 26.0%
2,500 rpm
18.0 - 21.0%
MASS AIRFLOW
●
Engine: After warming up
●
Air conditioner switch: OFF
●
Shift lever: N (A/T), Neutral (M/T)
●
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
P0102
Mass air flow sensor
circuit low input
An excessively low voltage from the sensor is
sent to ECM.
This self-diagnosis has the one trip detection
logic.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Intake air leaks
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Mass air flow sensor
P0103
Mass air flow sensor
circuit high input
An excessively high voltage from the sensor is
sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Mass air flow sensor
Detected items
Engine operating condition in fail-safe mode
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
EC-728
[VG33E]
DTC P0102, P0103 MAF SENSOR
PROCEDURE FOR DTC P0102
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and wait at least 5 seconds at most.
4.
If DTC is detected, go to
EC-730, "Diagnostic Procedure"
If DTC is not detected, go to next step.
5.
Start engine and let it idle for at least 6 seconds.
6.
If DTC is detected, go to
EC-730, "Diagnostic Procedure"
With GST
Follow the procedure “With CONSULT-II”.
PROCEDURE FOR DTC P0103
With CONSULT-II
1.
Turn ignition switch ON.
2.
If 1st trip DTC is detected,
Select “DATA MONITOR” mode with CONSULT-II.
3.
Wait at least 6 seconds.
4.
If 1st trip DTC is detected, go to
EC-730, "Diagnostic Procedure"
.
If 1st trip DTC is not detected, go to next step.
5.
Start engine and let it idle for at least 6 seconds.
6.
If 1st trip DTC is detected, go to
EC-730, "Diagnostic Procedure"
.
With GST
Follow the procedure “With CONSULT-II”.
SEF058Y
SEF058Y
DTC P0102, P0103 MAF SENSOR
EC-729
[VG33E]
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Wiring Diagram
UBS00DGE
BBWA0470E
EC-730
[VG33E]
DTC P0102, P0103 MAF SENSOR
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 the ECM terminals, such as the ground.
Diagnostic Procedure
UBS00DGF
1.
INSPECTION START
Which malfunction (P0102 or P0103) is duplicated?
P0102 or P0103
P0102 >> GO TO 2.
P0103 >> GO TO 3.
2.
CHECK INTAKE SYSTEM
Check the following for connection.
●
Air duct
●
Vacuum hoses
●
Intake air passage between air duct to intake manifold collector
OK or NG
OK
>> GO TO 3.
NG
>> Reconnect the parts.
3.
RETIGHTEN GROUND SCREWS
1.
Turn ignition switch OFF.
2.
Loosen and retighten engine ground screws.
>> GO TO 4.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
54
R
Mass air flow sensor
[Engine is running]
●
Warm-up condition
●
Idle speed
1.0 - 1.7V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,500 rpm
1.7 - 2.3V
55
G
Mass air flow sensor
ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
BBIA0418E
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