Nissan Cube. Manual - part 316

EC-150

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P0101 MAF SENSOR

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 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 INTAKE AIR TEMPERATURE SENSOR

Check intake air temperature sensor.
Refer to 

EC-162, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

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

EM-24, "Exploded

View"

.

9.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-279, "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-150, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace mass air flow sensor. Refer to 

EM-24, "Exploded View"

.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009947268

1.

CHECK MASS AIR FLOW SENSOR-I

With CONSULT

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F4

4

F8

52

Existed

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F4

3

F8

45

Existed

P0101 MAF SENSOR

EC-151

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

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3.

Start engine and warm it up to normal operating temperature.

4.

Connect CONSULT 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

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

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.

Is the inspection result normal?

YES

>> INSPECTION END

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 the following.

-

Crushed air ducts

-

Malfunctioning seal of air cleaner element

-

Uneven dirt of air cleaner element

-

Intake valve deposits

-

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

1.

Repair or replace malfunctioning part.

2.

Start engine and warm it up to normal operating temperature.

3.

Connect CONSULT and select “DATA MONITOR” mode.

4.

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

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 temper-
ature.)

0.7 - 1.1 V

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

1.3 - 1.7 V

Idle to about 4,000 rpm

0.7 - 1.1 V to Approx. 2.4 V*

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

45

(MAF sensor 

signal)

Ground

Ignition switch ON (Engine 
stopped.)

Approx. 0.4 V

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

0.7 - 1.1 V

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

1.3 - 1.7 V

Idle to about 4,000 rpm

0.7 - 1.1 V to Ap-

prox. 2.4 V*

EC-152

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P0101 MAF SENSOR

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

Without CONSULT

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 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

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 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

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.

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 temper-
ature.)

0.7 - 1.1 V

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

1.3 - 1.7 V

Idle to about 4,000 rpm

0.7 - 1.1 V to Approx. 2.4 V*

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

45

(MAF sensor 

signal)

Ground

Ignition switch ON (Engine 
stopped.)

Approx. 0.4 V

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

0.7 - 1.1 V

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

1.3 - 1.7 V

Idle to about 4,000 rpm

0.7 - 1.1 V to Ap-

prox. 2.4 V*

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 temper-
ature.)

0.7 - 1.1 V

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

1.3 - 1.7 V

Idle to about 4,000 rpm

0.7 - 1.1 V to Approx. 2.4 V*

P0101 MAF SENSOR

EC-153

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

*: 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

>> Clean or replace mass air flow sensor. Refer to 

EM-24, "Exploded View"

.

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

45

(MAF sensor 

signal)

Ground

Ignition switch ON (Engine 
stopped.)

Approx. 0.4 V

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

0.7 - 1.1 V

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

1.3 - 1.7 V

Idle to about 4,000 rpm

0.7 - 1.1 V to Ap-

prox. 2.4 V*