Nissan Altima L32. Instruction — part 519

P0101 MAF SENSOR

EC-1197

< COMPONENT DIAGNOSIS >

[VQ35DE]

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6.

CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between MAF sensor harness connector and ECM harness connector.

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, 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, short to ground or short to power in harness or connectors.

8.

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to

EC-1208, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace mass air flow sensor (with intake air temperature sensor).

9.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-1334, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace EVAP control system pressure sensor.

10.

CHECK MASS AIR FLOW SENSOR

Refer to

EC-1197, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace mass air flow sensor.

11.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000004362048

1.

CHECK MASS AIR FLOW SENSOR-I

With CONSULT-III

1. Reconnect all harness connectors disconnected.

2. 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

EC-1198

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0101 MAF SENSOR

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

4. Select “MAS A/F SE-B1” and check indication under the following conditions.

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

Without CONSULT-III

1. Reconnect all harness connectors disconnected.

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

3. Check the voltage between ECM harness connector terminals

under the following conditions.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

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

Check for the cause of uneven air flow via the mass air flow sensor. Refer to the 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 under the following conditions.

Monitor item

Condition

MAS A/F SE-B1 (V)

MAS A/F SE-B1

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

0.9 - 1.2

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

1.6 - 1.9

Idle to approximately 4,000 rpm

0.9 - 1.2 to Approx. 2.4*

ECM

Condition

Voltage (V)

Con-

nector

+

–

Terminal

Terminal

F13

58

(MAF

sensor
signal)

56

(Sensor
ground)

Ignition switch ON (Engine
stopped.)

Approx. 0.4

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

0.9 - 1.2

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

1.6 - 1.9

Idle to approximately 4,000 rpm

0.9 - 1.2 to

Approx. 2.4*

JMBIA1862ZZ

Monitor item

Condition

MAS A/F SE-B1 (V)

MAS A/F SE-B1

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

0.9 - 1.2

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

1.6 - 1.9

Idle to approximately 4,000 rpm

0.9 - 1.2 to Approx. 2.4*

P0101 MAF SENSOR

EC-1199

< COMPONENT DIAGNOSIS >

[VQ35DE]

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

Without CONSULT-III

1. Repair or replace malfunctioning part.

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

3. Check the voltage between ECM harness connector terminals

under the following conditions.

*: Check for linear voltage rise in response to engine being increased to approximately 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 under the following conditions.

*: Check for linear voltage rise in response to engine being increased to approximately 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 terminals

under the following conditions.

ECM

Condition

Voltage (V)

Con-

nector

+

–

Terminal

Terminal

F13

58

(MAF

sensor
signal)

56

(Sensor
ground)

Ignition switch ON (Engine
stopped.)

Approx. 0.4

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

0.9 - 1.2

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

1.6 - 1.9

Idle to approximately 4,000 rpm

0.9 - 1.2 to

Approx. 2.4*

JMBIA1862ZZ

Monitor item

Condition

MAS A/F SE-B1 (V)

MAS A/F SE-B1

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

0.9 - 1.2

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

1.6 - 1.9

Idle to approximately 4,000 rpm

0.9 - 1.2 to Approx. 2.4*

JMBIA1862ZZ

EC-1200

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0101 MAF SENSOR

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Clean or replace mass air flow sensor.

ECM

Condition

Voltage (V)

Con-

nector

+

–

Terminal

Terminal

F13

58

(MAF

sensor
signal)

56

(Sensor
ground)

Ignition switch ON (Engine
stopped.)

Approx. 0.4

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

0.9 - 1.2

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

1.6 - 1.9

Idle to approximately 4,000 rpm

0.9 - 1.2 to

Approx. 2.4*