Nissan Frontier D22. Manual - part 404

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-719

[VG33E]

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EC

1.

Check resistance between HO2S2 terminals 2 and 3.

2.

Check continuity.

3.

If NG, replace heated oxygen sensor 2.

CAUTION:

●

Discard any heated oxygen sensor which has been dropped
from a height of more than 0.5 m (19.7 in) onto a hard sur-
face such as a concrete floor; use a new one.

●

Before installing new oxygen sensor, clean exhaust system
threads using Oxygen Sensor Thread Cleaner tool J-43897-
18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation

UBS00DG1

HEATED OXYGEN SENSOR 2

Refer to 

EX-3, "EXHAUST SYSTEM"

 .

Resistance: 2.3 - 4.3

Ω at 25°C (77°F)

Terminal No.

Continuity

1 and 2, 3, 4

No

4 and 1, 2, 3

SEF716W

EC-720

[VG33E]

DTC P0101 MAF SENSOR

DTC P0101 MAF SENSOR

PFP:22680

Component Description

UBS00DG2

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

UBS00DG3

Specification data are reference values.

On Board Diagnosis Logic

UBS00DG4

DTC Confirmation Procedure

UBS00DG5

Perform PROCEDURE FOR MALFUNCTION A first.
If the 1st trip DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.

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 MALFUNCTION A

NOTE:
If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.

SEF030T

MONITOR ITEM

CONDITION

SPECIFICATION

MAS A/F SE-B1

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Engine: After warming up

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Air conditioner switch: OFF

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Shift lever: N (A/T), Neutral (M/T)

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No load

Idle

1.0 - 1.7V

2,500 rpm

1.7 - 2.3V

CAL/LD VALUE

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Engine: After warming up

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Air conditioner switch: OFF

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Shift lever: N (A/T), Neutral (M/T)

●

No load

Idle

18.5 - 26.0%

2,500 rpm

18.0 - 21.0%

MASS AIRFLOW

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Engine: After warming up

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Air conditioner switch: OFF

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Shift lever: N (A/T), Neutral (M/T)

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No load

Idle

3.3 - 4.8 g·m/s

2,500 rpm

12.0 - 14.9 g·m/s

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0101

Mass air flow sensor cir-
cuit range/performance 
problem

A)

A high voltage from the sensor is sent to ECM 
under light load driving condition.

●

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

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Mass air flow sensor

B)

A low voltage from the sensor is sent to ECM 
under heavy load driving condition.

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

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Intake air leaks

●

Mass air flow sensor

DTC P0101 MAF SENSOR

EC-721

[VG33E]

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EC

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and warm it up to normal operating temperature.

4.

Run engine for at least 10 seconds at idle speed.

5.

If 1st trip DTC is detected, go to 

EC-724, "Diagnostic Procedure"

.

 With GST

Follow the procedure “With CONSULT-II”.

PROCEDURE FOR MALFUNCTION B

CAUTION:

Always drive vehicle at a safe speed.

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to 

EC-724, "Diagnostic Procedure"

 .

3.

Select “DATA MONITOR” mode with CONSULT-II.

4.

Check the voltage of MAS AIR/FL SE with “DATA MONITOR”.

5.

Increases engine speed to about 4,000 rpm.

6.

Monitor the linear voltage rise in response to engine speed
increases.
If NG, go to 

EC-724, "Diagnostic Procedure"

 .

If OK, go to following step.

SEF174Y

SEF998NA

EC-722

[VG33E]

DTC P0101 MAF SENSOR

7.

Maintain the following conditions for at least 10 consecutive sec-
onds.

8.

If 1st trip DTC is detected, go to 

EC-724, "Diagnostic Procedure"

.

Overall Function Check

UBS00DG6

PROCEDURE FOR MALFUNCTION B

Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip
DTC might not be confirmed.

 With GST

1.

Start engine and warm it up to normal operating temperature.

2.

Select MODE 1 with GST.

3.

Check the mass air flow sensor signal with MODE 1.

4.

Check for linear mass air flow sensor signal value rise in
response to increases to about 4,000 rpm in engine speed.

5.

If NG, go to 

EC-724, "Diagnostic Procedure"

 .

ENG SPEED

More than 2,000 rpm

THRTL POS SEN

More than 3V

Selector lever

Suitable position

Driving location

Driving vehicle uphill (Increased engine load) will 
help maintain the driving conditions required for 
this test.

SEF175Y

SEF534P