2004 INFINITI QX56 Factory Service Manual

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Page 1345 of 3371

INFINITI QX56 2004 Factory Service Manual EC-154Revision: August 2007
DTC P0102, P0103 MAF SENSOR
2004 QX56
DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionUBS00H14
The mass air flow sensor is placed in the stream of intake air. It

EC-154Revision: August 2007
DTC P0102, P0103 MAF SENSOR
2004 QX56
DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionUBS00H14
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 ModeUBS00H15
Specification data are reference values.
On Board Diagnosis LogicUBS00H16
These self-diagnoses have the one trip detection logic.
FAIL -S AFE M OD E
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
BBIA0355E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1
Engine: After warming up
Air conditioner switch: OFF
Shift lever: N
No loadIdle Approx. 1.1 - 1.4V
2,500 rpm Approx. 1.7 - 2.0V
CAL/LD VALUE
Engine: After warming up
Air conditioner switch: OFF
Shift lever: N
No loadIdle 14% - 33%
2,500 rpm 12% - 25%
MASS AIRFLOW
Engine: After warming up
Air conditioner switch: OFF
Shift lever: 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 1346 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-155
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Revision: August 20072004 QX56
DTC Confirmation ProcedureUBS00H17
NOTE:
If DTC Confirmation Procedure has been previously conducted, always

Page 1347 of 3371

INFINITI QX56 2004 Factory Service Manual EC-156Revision: August 2007
DTC P0102, P0103 MAF SENSOR
2004 QX56
Wiring DiagramUBS00H18
BBWA11 60 E

Page 1348 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-157
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Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not u

Page 1349 of 3371

INFINITI QX56 2004 Factory Service Manual EC-158Revision: August 2007
DTC P0102, P0103 MAF SENSOR
2004 QX56
3. RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
Refer to EC-133, "
Gr

Page 1350 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-159
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Revision: August 20072004 QX56
6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness

Page 1351 of 3371

INFINITI QX56 2004 Factory Service Manual EC-160Revision: August 2007
DTC P0102, P0103 MAF SENSOR
2004 QX56
Component InspectionUBS00H1A
MASS AIR FLOW SENSOR
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to

Page 1352 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0112, P0113 IAT SENSOR
EC-161
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Revision: August 20072004 QX56
DTC P0112, P0113 IAT SENSORPFP:22630
Component DescriptionUBS00H1C
The intake air temperature sensor is buil

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