2007 INFINITI M35 Factory Service Manual

Page 1729 of 4647

INFINITI M35 2007 Factory Service Manual EC-200
[VQ35DE]
DTC P0101 MAF SENSOR
Revision: 2007 April2007 M35/M45
Component InspectionNBS004UV
MASS AIR FLOW SENSOR
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engi

EC-200
[VQ35DE]
DTC P0101 MAF SENSOR
Revision: 2007 April2007 M35/M45
Component InspectionNBS004UV
MASS AIR FLOW SENSOR
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT-II and select “DATA MONITOR” mode.
4. Select “MAS A/F SE-B1” and check indication under the follow-
ing conditions.
*: Check for linear voltage rise in response to engine being increased to about
4,000 rpm.
5. If the voltage is out of specification, proceed the following.
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
Crushed air ducts
Malfunctioning seal of air cleaner element
Uneven dirt of air cleaner element
Improper specification of intake air system parts
b. If NG, repair or replace malfunctioning part and perform step 2 to 4 again.
If OK, go to next step.
6. Turn ignition switch OFF.
7. Disconnect mass air flow sensor harness connector and reconnect it again.
8. Perform step 2 to 4 again.
9. If NG, clean or replace mass air flow sensor.
Without CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 51 (Mass air flow sensor
signal) and ground.
*: Check for linear voltage rise in response to engine being increased to about
4,000 rpm.
4. If the voltage is out of specification, proceed the following.
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
Crushed air ducts
Malfunctioning seal of air cleaner element
Uneven dirt of air cleaner element
Improper specification of intake air system parts
Condition MAS A/F SE-B1 (V)
Ignition switch ON (Engine stopped.) Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)0.9 - 1.2
2,500 rpm (Engine is warmed-up to
normal operating temperature.)1.6 - 1.9
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
PBIB2371E
Condition Voltage V
Ignition switch ON (Engine stopped.) Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)0.9 - 1.2
2,500 rpm (Engine is warmed-up to
normal operating temperature.)1.6 - 1.9
Idle to about 4,000 rpm 0.9 - 1.2 to Approx. 2.4*
PBIB1106E

Page 1730 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0101 MAF SENSOR
EC-201
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Revision: 2007 April2007 M35/M45
b. If NG, repair or replace malfunctioning part and perform step 2 and 3 again.
If OK, go to next step.

Page 1731 of 4647

INFINITI M35 2007 Factory Service Manual EC-202
[VQ35DE]
DTC P0102, P0103 MAF SENSOR
Revision: 2007 April2007 M35/M45
DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionNBS004UX
The mass air flow sensor (1) is placed in the stream of

EC-202
[VQ35DE]
DTC P0102, P0103 MAF SENSOR
Revision: 2007 April2007 M35/M45
DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionNBS004UX
The mass air flow sensor (1) is placed in the stream of intake air. It
measures 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 ModeNBS004UY
Specification data are reference values.
On Board Diagnosis LogicNBS004UZ
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
PBIA9559J
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-143, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
CAL/LD VALUE
Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No loadIdle 5% - 35%
2,500 rpm 5% - 35%
MASS AIRFLOW
Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No loadIdle 2.0 - 6.0 g·m/s
2,500 rpm 7.0 - 20.0 g·m/s
DTC No.Trouble diagnosis
nameDTC 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 1732 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-203
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Revision: 2007 April2007 M35/M45
DTC Confirmation ProcedureNBS004V0
NOTE:
If DTC Confirmation Procedure has been previously conduc

Page 1733 of 4647

INFINITI M35 2007 Factory Service Manual EC-204
[VQ35DE]
DTC P0102, P0103 MAF SENSOR
Revision: 2007 April2007 M35/M45
Wiring DiagramNBS004V1
TBWT0950E

Page 1734 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-205
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Revision: 2007 April2007 M35/M45
Specification data are reference values and are measured between each terminal and ground.
CAUTIO

Page 1735 of 4647

INFINITI M35 2007 Factory Service Manual EC-206
[VQ35DE]
DTC P0102, P0103 MAF SENSOR
Revision: 2007 April2007 M35/M45
3. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
Refer to E

Page 1736 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-207
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Revision: 2007 April2007 M35/M45
6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect

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