2007 INFINITI QX56 Factory Service Manual

boot oil viscosity fog light bulb brake pads replacement transmission fluid sunroof

Load previous 8 pages

Page 1273 of 3061

INFINITI QX56 2007 Factory Service Manual EC-190
< SERVICE INFORMATION >
DTC P0101 MAF SENSOR
Diagnosis Procedure
INFOID:0000000003531686
1.INSPECTION START
Which malfunction (A or B) is duplicated?
A or B
A>>GO TO 3.
B>>GO TO 2.
2.CHECK INTA

Page 1274 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0101 MAF SENSOR
EC-191
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
4.CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector.
2. Turn ignition

Page 1275 of 3061

INFINITI QX56 2007 Factory Service Manual EC-192
< SERVICE INFORMATION >
DTC P0101 MAF SENSOR
Refer to EC-204, "Component Inspection".
OK or NG
OK >> GO TO 9.
NG >> Replace intake air temperature sensor.
9.CHECK EVAP CONTROL SYSTEM PRESSURE S

Page 1276 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0101 MAF SENSOR
EC-193
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3.

Page 1277 of 3061

INFINITI QX56 2007 Factory Service Manual EC-194
< SERVICE INFORMATION >
DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
Component DescriptionINFOID:0000000003531689
The mass air flow sensor is placed in the stream of intake air. It m

EC-194
< SERVICE INFORMATION >
DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
Component DescriptionINFOID:0000000003531689
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 the 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 ModeINFOID:0000000003531690
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000003531691
These self-diagnoses have the one trip detection logic.
FA I L - S A F E M O D E
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000003531692
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.
PROCEDURE FOR DTC P0102
With CONSULT-II
1. Turn ignition switch ON.
BBIA0355E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-129
.
CAL/LD VALUE• Engine: After warming up
• Air conditioner switch: OFF
• Selector lever: P or N
•No loadIdle 14% - 33%
2,500 rpm 12% - 25%
MASS AIRFLOW• Engine: After warming up
• Air conditioner switch: OFF
• Selector lever: P or N
•No loadIdle 3.0 - 9.0 g·m/s
2,500 rpm 9.0 - 28.0 g·m/s
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0102
0102Mass 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.)
• Intake air leaks
• Mass air flow sensor
P0103
0103Mass air flow sensor circuit
high inputAn 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.

Page 1278 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-195
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and wait at least 5 seconds.
4. If DTC is

Page 1279 of 3061

INFINITI QX56 2007 Factory Service Manual EC-196
< SERVICE INFORMATION >
DTC P0102, P0103 MAF SENSOR
Wiring Diagram
INFOID:0000000003531693
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do

Page 1280 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-197
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Diagnosis ProcedureINFOID:0000000003531694
1.INSPECTION START
Which malfunction (P0102 or P0103) is duplicate

Load next 8 pages

Page: < prev 1-10 ... 1241-1248 1249-1256 1257-1264 1265-1272 1273-1280 1281-1288 1289-1296 1297-1304 1305-1312 ... 3064 next >

immobilizer radio antenna wheel bolt torque winter tyres roof rack infotainment