Infiniti F50. Manual - part 383

DTC P0101 MAF SENSOR

EC-173

C

D

E

F

G

H

I

J

K

L

M

A

EC

7.

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

8.

If DTC is detected, go to 

EC-175, "Diagnostic Procedure"

 .

Overall Function Check

EBS00LXG

PROCEDURE FOR MALFUNCTION B

Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 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-175, "Diagnostic Procedure"

 .

ENG SPEED

More than 2,000 rpm

THRTL SEN 1

More than 3V

THRTL SEN 2

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.

PBIB0199E

SEF534P

EC-174

DTC P0101 MAF SENSOR

Wiring Diagram

EBS00LXH

TBWM0142E

DTC P0101 MAF SENSOR

EC-175

C

D

E

F

G

H

I

J

K

L

M

A

EC

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

EBS00LXI

1. 

INSPECTION START

Which malfunction (A or B) is duplicated?

A or B

A

>> GO  TO  3.

B

>> GO  TO  2.

2. 

CHECK INTAKE SYSTEM

Check the following for connection.

●

Air duct

●

Vacuum hoses

●

Intake air passage between air duct and intake manifold

OK or NG

OK

>> GO TO 3.

NG

>> Reconnect the parts.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

42

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch “OFF”]

●

For a few seconds after turning ignition 
switch “OFF”

0 - 1.0V

[Ignition switch “OFF”]

●

More than a few seconds passed after turn-
ing ignition switch “OFF”

BATTERY VOLTAGE
(11 - 14V)

91

B/Y

Mass air flow sensor

[Engine is running]

●

Warm-up condition

●

Idle speed

1.1 - 1.5V

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,500 rpm.

1.7 - 2.4V

103

L

Sensor power supply

[Ignition switch “ON”]

Approximately 5V

109

LG

Mass air flow sensor ground

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

163
166

R
R

Power supply for ECM

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

EC-176

DTC P0101 MAF SENSOR

3. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”.

2.

Loosen and retighten engine ground screws.

>> GO TO 4.

4. 

CHECK MAF SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect mass air flow (MAF) sensor harness connector.

2.

Turn ignition switch “ON”.

3.

Check voltage between MAF sensor terminals 2, 4 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 connectors M135, F105

●

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

●

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

>> Repair harness or connectors.

PBIB0011E

PBIB0012E

Terminal

Voltage

2

Approximately 5V

4

Battery voltage

PBIB0076E