Infiniti QX56 (Z62). Manual - part 556

 

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Infiniti QX56 (Z62). Manual - part 556

 

 

EC-202

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0102, P0103 MAF SENSOR

• 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 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 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• 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
• Loose or poor connection for each connector and harness

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

5.

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 6.

NO

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

6.

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 7.

NO

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

7.

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-203, "Component Inspection (MAF Sensor)"

.

Is the inspection result normal?

MAF sensor

Ground

Voltage

Connector

Terminal

F31

5

Ground

Battery voltage

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F31

4

F111

25

Existed

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F31

3

F111

22

Existed

P0102, P0103 MAF SENSOR

EC-203

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

YES

>> GO TO 8.

NO

>> Replace mass air flow sensor. Refer to 

EM-27, "Exploded View"

.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (MAF Sensor)

INFOID:0000000006290102

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 the 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.

4.

Check the voltage between ECM harness connector terminals under the following conditions.

*: 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

-

Improper specification of intake air system parts

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

Monitor item

Condition

Indication (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 - 1.1

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

1.4 - 1.9

Idle to about 4,000 rpm

0.9 - 1.1 to Approx. 2.4*

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

F111

22

(MAF sensor signal)

25

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

0.9 - 1.1

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

1.4 - 1.9

Idle to about 4,000 rpm

0.9 - 1.1 to Approx. 2.4*

EC-204

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0102, P0103 MAF SENSOR

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 the 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.

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 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 the 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 terminals under the following conditions.

Monitor item

Condition

Indication (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 - 1.1

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

1.4 - 1.9

Idle to about 4,000 rpm

0.9 - 1.1  to Approx. 2.4*

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

F111

22

(MAF sensor signal)

25

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

0.9 - 1.1

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

1.4 - 1.9

Idle to about 4,000 rpm

0.9 - 1.1  to Approx. 2.4*

Monitor item

Condition

Indication (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 - 1.1

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

1.4 - 1.9

Idle to about 4,000 rpm

0.9 - 1.1  to Approx. 2.4*

P0102, P0103 MAF SENSOR

EC-205

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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 malfunctioning mass air flow sensor. Refer to 

EM-27, "Removal and Installation"

.

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

F111

22

(MAF sensor signal)

25

Ignition switch ON (Engine stopped.)

Approx. 0.4

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

0.9 - 1.1

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

1.4 - 1.9

Idle to about 4,000 rpm

0.9 - 1.1  to Approx. 2.4*

 

 

 

 

 

 

 

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