Nissan Cube. Manual - part 317

EC-154

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P0102, P0103 MAF SENSOR

P0102, P0103 MAF SENSOR

Description

INFOID:0000000009947269

The mass air flow sensor (1) is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss. 
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.

DTC Logic

INFOID:0000000009947270

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
Which DTC is detected?

P0102 >> GO TO 2.
P0103 >> GO TO 3.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0102

1.

Start engine and wait at least 5 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-155, "Diagnosis Procedure"

.

NO

>> INSPECTION END

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-I

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-155, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P0103-II

1.

Start engine and wait at least 5 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-155, "Diagnosis Procedure"

.

NO

>> INSPECTION END

PBIA9559J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0102

Mass air flow 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 leaks
• Mass air flow sensor

P0103

Mass air flow sensor circuit 
high input

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

• Harness or connectors

(The sensor circuit is open or shorted.)

• Mass air flow sensor

P0102, P0103 MAF SENSOR

EC-155

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

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Diagnosis Procedure

INFOID:0000000009947271

1.

INSPECTION START

Confirm the detected DTC.

Which DTC is detected?

P0102 >> GO TO 2.
P0103 >> GO TO 3.

2.

CHECK INTAKE SYSTEM

Check the following for connection.
• Air duct
• Vacuum hoses
• Intake air passage between air duct to intake manifold
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Reconnect the parts.

3.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E38. Refer to 

GI-43, "Circuit Inspection"

. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace ground connection.

4.

CHECK MAF SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect mass air flow (MAF) sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between MAF sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E8, F1
• Harness for open or short between mass air flow sensor and ECM
• Harness for open or short between mass air flow sensor and IPDM E/R

>> Repair open circuit or short to ground or short to power in 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 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?

MAF sensor

Ground

Voltage

Connector

Terminal

F4

5

Ground

Battery voltage

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F4

4

F8

52

Existed

EC-156

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P0102, P0103 MAF SENSOR

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-156, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace mass air flow sensor. Refer to 

EM-24, "Exploded View"

.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009947272

1.

CHECK MASS AIR FLOW SENSOR-I

With CONSULT

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 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.

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F4

3

F8

45

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 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*

P0102, P0103 MAF SENSOR

EC-157

< DTC/CIRCUIT DIAGNOSIS >

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*: 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.

*: 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.

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*