2005 INFINITI FX35 Service Manual

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Page 2289 of 4731

INFINITI FX35 2005 Service Manual EC-896
[VK45DE]
DTC P0101 MAF SENSOR
Revision: 2005 July 2005 FX
Wiring DiagramABS00E4W
TBWM0722E

Page 2290 of 4731

INFINITI FX35 2005 Service Manual DTC P0101 MAF SENSOR EC-897
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EC
Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and ground.
CAU

Page 2291 of 4731

INFINITI FX35 2005 Service Manual EC-898
[VK45DE]
DTC P0101 MAF SENSOR
Revision: 2005 July 2005 FX
3. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to EC-861

Page 2292 of 4731

INFINITI FX35 2005 Service Manual DTC P0101 MAF SENSOR EC-899
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Revision: 2005 July 2005 FX
6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconn

Page 2293 of 4731

INFINITI FX35 2005 Service Manual EC-900
[VK45DE]
DTC P0101 MAF SENSOR
Revision: 2005 July 2005 FX
Component InspectionABS00E4Y
MASS AIR FLOW SENSOR
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine

EC-900
[VK45DE]
DTC P0101 MAF SENSOR
Revision: 2005 July 2005 FX
Component InspectionABS00E4Y
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.) 1.0 - 1.3
2,500 rpm (Engine is warmed-up to
normal operating temperature.) 1.6 - 2.0
Idle to about 4,000 rpm* 1.0 - 1.3 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.) 1.0 - 1.3
2,500 rpm (Engine is warmed-up to
normal operating temperature.) 1.6 - 2.0
Idle to about 4,000 rpm* 1.0 - 1.3 to Approx. 2.4
PBIB1106E

Page 2294 of 4731

INFINITI FX35 2005 Service Manual DTC P0101 MAF SENSOR EC-901
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Revision: 2005 July 2005 FX
b. If NG, repair or replace malfunctioning part and perform step 2 to 3 again.
If OK, go to ne

Page 2295 of 4731

INFINITI FX35 2005 Service Manual EC-902
[VK45DE]
DTC P0102, P0103 MAF SENSOR
Revision: 2005 July 2005 FX
DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionABS007JL
The mass air flow sensor is placed in the stream of intake ai

EC-902
[VK45DE]
DTC P0102, P0103 MAF SENSOR
Revision: 2005 July 2005 FX
DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionABS007JL
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 ModeABS007JM
Specification data are reference values.
On Board Diagnosis LogicABS007JN
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.
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-844, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
CAL/LD VALUE
Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No load Idle 14% - 33%
2,500 rpm 12% - 25%
MASS AIRFLOW
Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No load Idle 2.0 - 6.0 g·m/s
2,500 rpm 7.0 - 20.0 g·m/s
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
P0102
0102 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.)
Intake air leaks
Mass air flow sensor
P0103
0103 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.

Page 2296 of 4731

INFINITI FX35 2005 Service Manual DTC P0102, P0103 MAF SENSOR EC-903
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Revision: 2005 July 2005 FX
DTC Confirmation ProcedureABS007JO
NOTE:
If DTC Confirmation Procedure has been previou

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