Infiniti M35/M45 Y50. Manual - part 432

DTC P0101 MAF SENSOR

EC-201

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b.

If NG, repair or replace malfunctioning part and perform step 2 and 3 again.
If OK, go to next step.

5.

Turn ignition switch OFF.

6.

Disconnect mass air flow sensor harness connector and reconnect it again.

7.

Perform step 2 and 3 again.

8.

If NG, clean or replace mass air flow sensor.

Removal and Installation

NBS004UW

MASS AIR FLOW SENSOR

Refer to 

EM-19, "AIR CLEANER AND AIR DUCT"

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EC-202

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DTC P0102, P0103 MAF SENSOR

DTC P0102, P0103 MAF SENSOR

PFP:22680

Component Description

NBS004UX

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 Mode

NBS004UY

Specification data are reference values.

On Board Diagnosis Logic

NBS004UZ

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"

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CAL/LD VALUE

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Engine: After warming up

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Selector lever: P or N

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Air conditioner switch: OFF

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No load

Idle

5% - 35%

2,500 rpm

5% - 35%

MASS AIRFLOW

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Engine: After warming up

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Selector lever: P or N

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Air conditioner switch: OFF

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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.

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Harness or connectors
(The sensor circuit is open or shorted.)

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Intake air leaks

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Mass air flow sensor

P0103
0103

Mass air flow sensor 
circuit high input

An excessively high voltage from the sensor is 
sent to ECM.

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Harness or connectors
(The sensor circuit is open or shorted.)

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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.

DTC P0102, P0103 MAF SENSOR

EC-203

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DTC Confirmation Procedure

NBS004V0

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.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and wait at least 5 seconds.

4.

If DTC is detected, go to 

EC-205, "Diagnostic Procedure"

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 With GST

Follow the procedure “With CONSULT-II” above.

PROCEDURE FOR DTC P0103

 With CONSULT-II 

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Wait at least 5 seconds.

4.

If DTC is detected, go to 

EC-205, "Diagnostic Procedure"

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If DTC is not detected, go to next step.

5.

Start engine and wait at least 5 seconds.

6.

If DTC is detected, go to 

EC-205, "Diagnostic Procedure"

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 With GST

Follow the procedure “With CONSULT-II” above.

SEF058Y

SEF058Y

EC-204

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DTC P0102, P0103 MAF SENSOR

Wiring Diagram

NBS004V1

TBWT0950E