Infiniti QX56 (Z62). Manual - part 553

 

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Infiniti QX56 (Z62). Manual - part 553

 

 

EC-190

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P006A, P0101 MAF SENSOR

Component Inspection (MAF Sensor)

INFOID:0000000006288271

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.

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.

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*

P006A, P0101 MAF SENSOR

EC-191

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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EC

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*: 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*

EC-192

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P006A, P0101 MAF SENSOR

*: 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*

P0075, P0081 IVT CONTROL SOLENOID VALVE

EC-193

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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P0075, P0081 IVT CONTROL SOLENOID VALVE

DTC Logic

INFOID:0000000006217781

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-193, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217782

1.

CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect intake valve timing (IVT) control solenoid valve harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between IVT control solenoid valve harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between IVT control solenoid valve 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.

3.

CHECK IVT CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0075

INT/V TIM V/CIR-B1
[Intake valve timing control sole-
noid valve (bank 1) circuit]

An improper voltage is sent to the ECM 
through intake valve timing control solenoid 
valve.

• Harness or connectors

(Intake valve timing control solenoid 
valve circuit is open or shorted.)

• Intake valve timing control solenoid 

valve

P0081

INT/V TIM V/CIR-B2
[Intake valve timing control sole-
noid valve (bank 2) circuit]

DTC

IVT control solenoid valve

Ground

Voltage

Bank

Connector

Terminal

P0075

1

F47

2

Ground

Battery voltage

P0081

2

F61

2

 

 

 

 

 

 

 

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