Nissan Frontier D22. Manual — part 260

DTC P0102, P0103 MAF SENSOR

EC-143

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EC

DTC P0102, P0103 MAF SENSOR

PFP:22680

Component Description

UBS00D2I

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. It consists of a hot wire that is supplied with electric current from
the ECM. The temperature of the hot wire is controlled by the ECM 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 ECM must supply more electric current 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

UBS00D2J

Specification data are reference values.

On Board Diagnosis Logic

UBS00D2K

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.

SEF893J

MONITOR ITEM

CONDITION

SPECIFICATION

MAS A/F SE-B1

●

Engine: After warming up

●

Air conditioner switch: OFF

●

Shift lever: P or N

●

No-load

Idle

0.9 - 1.8V

2,500 rpm

1.9 - 2.3V

CAL/LD VALUE

●

Engine: After warming up

●

Air conditioner switch: OFF

●

Shift lever: P or N

●

No-load

Idle

9.5 - 34.0%

2,500 rpm

13.9 - 24.9%

MASS AIRFLOW

●

Engine: After warming up

●

Air conditioner switch: OFF

●

Shift lever: P or N

●

No-load

Idle

0.9 - 5.8 g·m/s

2,500 rpm

7.5 - 13.2 g·m/s

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

P0102

Mass air flow sensor
circuit low input

An excessively low voltage from the sensor is
sent to ECM, when engine is running.

●

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

●

Intake air leaks

●

Mass air flow sensor

P0103

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.

EC-144

[KA24DE]

DTC P0102, P0103 MAF SENSOR

DTC Confirmation Procedure

UBS00D2L

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 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 5 seconds at most.

4.

If DTC is detected, go to

EC-146, "Diagnostic Procedure"

.

With GST

Follow the procedure “With CONSULT-II”.

PROCEDURE FOR DTC P0103

With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Wait at least 6 seconds.

4.

If DTC is detected, go to

EC-146, "Diagnostic Procedure"

7.

If DTC is not detected, go to next step.

5.

Start engine and let it idle for at least 6 seconds.

6.

If DTC is detected, go to

EC-146, "Diagnostic Procedure"

.

With GST

Follow the procedure “With CONSULT-II”.

SEF058Y

SEF058Y

DTC P0102, P0103 MAF SENSOR

EC-145

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Wiring Diagram

UBS00D2M

BBWA1055E

EC-146

[KA24DE]

DTC P0102, P0103 MAF SENSOR

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

UBS00D2N

1.

INSPECTION START

Which malfunction (P0102 or P0103) is duplicated?

P0102 or P0103

P0102 >> GO TO 2.
P0103 >> GO TO 3.

2.

CHECK INTAKE SYSTEM

Check the followings for connection.

●

Air duct

●

Air cleaner

●

Vacuum hoses

●

Intake air passage between air duct to collector

OK or NG

OK

>> GO TO 3.

NG

>> Reconnect the parts.

3.

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch OFF.

2.

Loosen and retighten engine ground screws.

>> GO TO 4.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

54

R

Mass air flow sensor

[Engine is running]

●

Warm-up condition

●

Idle speed

0.9 - 1.8V

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,500 rpm

1.9 - 2.3V

55

G

Mass air flow sensor
ground

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

BBIA0431E