Nissan Altima L32. Manual - part 264

P0102, P0103 MAF SENSOR

EC-177

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 7.

NO

>> 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 the continuity between MAF sensor harness connector and ECM harness connector.

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 8.

NO

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

8.

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-171, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace mass air flow sensor.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000004349220

1.

CHECK MASS AIR FLOW SENSOR-I

With CONSULT-III

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Start engine and warm it up to normal operating temperature.

4. Connect CONSULT-III and select “DATA MONITOR” mode.

5. Select “MAS A/F SE-B1” and check indication.

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

Without CONSULT-III

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Start engine and warm it up to normal operating temperature.

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F31

4

F13

56

Existed

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F31

3

F13

58

Existed

Monitor item

Condition

MAS A/F SE-B1

MAS A/F SE-B1

Ignition switch ON (Engine stopped.)

Approx. 0.4 V

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

0.9 - 1.1 V

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

1.4 - 1.7 V

Idle to about 4,000 rpm

0.9 - 1.1 V to Approx. 2.4 V*

EC-178

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0102, P0103 MAF SENSOR

4. Check the voltage between ECM harness connector and

ground.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK FOR THE CAUSE OF UNEVEN AIR FLOW THROUGH MASS AIR FLOW SENSOR

1. Turn ignition switch OFF.

2. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.

-

Crushed air ducts

-

Malfunctioning seal of air cleaner element

-

Uneven dirt of air cleaner element

-

Improper specification of intake air system parts

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK MASS AIR FLOW SENSOR-II

With CONSULT-III

1. Repair or replace malfunctioning part.

2. Start engine and warm it up to normal operating temperature.

3. Connect CONSULT-III and select “DATA MONITOR” mode.

4. Select “MAS A/F SE-B1” and check indication.

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

Without CONSULT-III

1. Repair or replace malfunctioning part.

2. Start engine and warm it up to normal operating temperature.

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

58

(MAF 

sensor 
signal)

Ground

Ignition switch ON (Engine 
stopped.)

Approx. 0.4 V

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

0.9 - 1.1 V

2,500 rpm (Engine is warmed-
up to normal operating temper-
ature.)

1.4 - 1.7 V

Idle to about 4,000 rpm

0.9 - 1.1 V to 

Approx. 2.4 V*

PBIB3481E

Monitor item

Condition

MAS A/F SE-B1

MAS A/F SE-B1

Ignition switch ON (Engine stopped.)

Approx. 0.4 V

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

0.9 - 1.1 V

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

1.4 - 1.7 V

Idle to about 4,000 rpm

0.9 - 1.1 V to Approx. 2.4 V*

P0102, P0103 MAF SENSOR

EC-179

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Check the voltage between ECM harness connector and

ground.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

4.

CHECK MASS AIR FLOW SENSOR-III

With CONSULT-III

1. Turn ignition switch OFF.

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

3. Start engine and warm it up to normal operating temperature.

4. Connect CONSULT-III and select “DATA MONITOR” mode.

5. Select “MAS A/F SE-B1” and check indication.

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

Without CONSULT-III

1. Turn ignition switch OFF.

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

3. Start engine and warm it up to normal operating temperature.

4. Check the voltage between ECM harness connector and

ground.

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

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

58

(MAF 

sensor 
signal)

Ground

Ignition switch ON (Engine 
stopped.)

Approx. 0.4 V

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

0.9 - 1.1 V

2,500 rpm (Engine is 
warmed-up to normal operat-
ing temperature.)

1.4 - 1.7 V

Idle to about 4,000 rpm

0.9 - 1.1 V to 

Approx. 2.4 V*

PBIB3481E

Monitor item

Condition

MAS A/F SE-B1

MAS A/F SE-B1

Ignition switch ON (Engine stopped.)

Approx. 0.4 V

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

0.9 - 1.1 V

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

1.4 - 1.7 V

Idle to about 4,000 rpm

0.9 - 1.1 V to Approx. 2.4 V*

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

58

(MAF sen-
sor signal)

Ground

Ignition switch ON (Engine 
stopped.)

Approx. 0.4 V

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

0.9 - 1.1 V

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

1.4 - 1.7 V

Idle to about 4,000 rpm

0.9 - 1.1 V to 

Approx. 2.4 V*

PBIB3481E

EC-180

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0102, P0103 MAF SENSOR

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Clean or replace mass air flow sensor.