Nissan Frontier D22. Manual - part 407

DTC P0102, P0103 MAF SENSOR

EC-731

[VG33E]

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4. 

CHECK MAF SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect mass air flow sensor harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between terminal 2 and ground with CONSULT-II
or tester.

OK or NG

OK

>> GO TO 6.

NG

>>  GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness for open or short between ECM relay and mass air flow sensor

●

Harness for open or short between mass air flow sensor and ECM

>> Repair harness or connectors.

6. 

CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between MAF sensor terminal 3 and ECM terminal 55.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 7.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

7. 

CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between MAF sensor terminal 4 and ECM terminal 54.
Refer to Wiring Diagram.

2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 8.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

AEC641A

Voltage: Battery voltage

SEF627W

Continuity should exist.

Continuity should exist.

EC-732

[VG33E]

DTC P0102, P0103 MAF SENSOR

8. 

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-732, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace mass air flow sensor.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00DGG

MASS AIR FLOW SENSOR

1.

Reconnect harness connectors disconnected.

2.

Start engine and warm it up to normal operating temperature.

3.

Check voltage between ECM terminal 54 (Mass air flow sensor
signal) and ground.

*: Check for linear voltage rise in response to increases to about 4,000 rpm in
engine speed.

4.

If the voltage is out of specification, proceed the following.

●

Turn ignition switch OFF.

●

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

●

Perform step 2 and 3 again.

5.

If NG, remove mass air flow sensor from air duct. Check hot wire for damage or dust.

6.

If NG, clean or replace mass air flow sensor.

Condition

Voltage V

Ignition switch ON (Engine stopped.)

Less than 1.0

Idle (Engine is warmed-up to normal operating 
temperature.)

1.0 - 1.7

2,500 rpm (Engine is warmed-up to normal oper-
ating temperature.)

1.7 - 2.3

Idle to about 4,000 rpm*

1.0 - 1.7 to Approx. 4.0

SEF747U

DTC P0112, P0113 IAT SENSOR

EC-733

[VG33E]

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DTC P0112, P0113 IAT SENSOR

PFP:22630

Component Description

UBS00DGH

The intake air temperature sensor is mounted to the air duct hous-
ing. The sensor detects intake air temperature and transmits a signal
to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.

<Reference data>

*: These data are reference values and are measured between ECM terminal 61
(Intake air temperature sensor) and ground.

CAUTION:

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

On Board Diagnosis Logic

UBS00DGI

DTC Confirmation Procedure

UBS00DGJ

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.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Wait at least 5 seconds.

4.

If 1st trip DTC is detected, go to 

EC-736, "Diagnostic Procedure"

.

LEC519

Intake air 

temperature

°C (°F)

Voltage*

(V)

Resistance

k

Ω

20 (68)

3.5

2.1 - 2.9

80 (176)

1.23

0.27 - 0.38

SEF012P

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P0112

Intake air tempera-
ture 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 temperature sensor

P0113

Intake air tempera-
ture sensor circuit 
high input

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

SEF058Y

EC-734

[VG33E]

DTC P0112, P0113 IAT SENSOR

 WITH GST

Follow the procedure “WITH CONSULT-II”.