Nissan Primera P12. Instruction — part 231
DTC P0101 MAF SENSOR
EC-109
[YD (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
9.
CHECK MASS AIR FLOW SENSOR
Refer to
EC-109, "Component Inspection"
.
OK or NG
OK
>> GO TO 10.
NG
>> Replace mass air flow sensor.
10.
CHECK INTERMITTENT INCIDENT
Refer to
EC-75, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
EBS013L1
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 Installation
EBS013L2
MASS AIR FLOW SENSOR
Refer to
EM-15, "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-110
[YD (WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
PFP:22680
Component Description
EBS013L3
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 Mode
EBS013L4
Specification data are reference values.
*: This signal is converted by ECM internally. Thus, it differs from ECM terminal voltage.
ECM Terminals and Reference Value
EBS013L5
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 Logic
EBS013L6
DTC Confirmation Procedure
EBS013L7
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-load
Idle
1.5 - 2.0V
2,000 rpm
2.2 - 2.7V
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC Voltage)
54
W
Mass air flow sensor
[Engine is running]
●
Warm-up condition
●
Idle speed
1.8 - 2.3V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
2.5 - 3.0V
67
—
Sensor ground
(Sensors shield circuit)
[Ignition switch ON]
Approximately 0.3V
73
B
Mass air flow sensor
ground
[Ignition switch ON]
Approximately 0.3V
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.
●
Harness or connectors
(The sensor circuit is open or
shorted.)
●
Mass air flow sensor
P0103
Mass air flow sensor circuit
high input
An excessively high voltage from the sensor is
sent to ECM.
DTC P0102, P0103 MAF SENSOR
EC-111
[YD (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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-113, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
SEF817Y
EC-112
[YD (WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
Wiring Diagram
EBS013L8
MBWA0644E
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