Infiniti QX56 (Z62). Manual - part 547

 

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Infiniti QX56 (Z62). Manual - part 547

 

 

EC-166

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

1.

Check for the cause of large engine friction. Refer to the following.

-

Engine oil level is too high

-

Engine oil viscosity

-

Belt tension of power steering, alternator, A/C compressor, etc. is excessive

-

Noise from engine

-

Noise from transmission, etc.

2.

Check for the cause of insufficient combustion. Refer to the following.

-

Valve clearance malfunction

-

Intake valve timing control function malfunction

-

Camshaft sprocket installation malfunction, etc.

>> Repair or replace malfunctioning part, and then GO TO 27.

16.

CHECK INTAKE SYSTEM

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

Is the inspection result normal?

YES

>> GO TO 18.

NO

>> Repair or replace malfunctioning part, and then GO TO 17.

17.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2” AND “B/FUEL SCHDL”

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and
check that each indication is within the SP value.

Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> “B/FUEL SCHDL” is more, “A/F ALPHA-B1” and “A/F ALPHA-B2” are less than the SP value: GO

TO 18.

18.

DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR

1.

Stop the engine.

2.

Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again.

>> GO TO 19.

19.

CHECK “A/F ALPHA-B1” AND “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1” and “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each
indication is within the SP value.

Is the measurement value within the SP value?

YES

>> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to 

EC-201, "Diagno-

sis Procedure"

Then GO TO 26.

NO

>> GO TO 20.

20.

CHECK “MAS A/F SE-B1”

Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.

Is the measurement value within the SP value?

YES

>> GO TO 21.

NO

>> More than the SP value: Replace malfunctioning mass air flow sensor, and then GO TO 26.

21.

REPLACE ECM

1.

Replace ECM.

2.

Perform 

EC-143, "Work Procedure"

.

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-167

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

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A

EC

N

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O

>> GO TO 26.

22.

CHECK INTAKE SYSTEM

Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
• Crushed air ducts
• Malfunctioning seal in air cleaner element
• Uneven dirt in air cleaner element
• Improper specification in intake air system

Is the inspection result normal?

YES

>> GO TO 24.

NO

>> Repair or replace malfunctioning part, and then GO TO 23.

23.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.

Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Less than the SP value: GO TO 24.

24.

CHECK “MAS A/F SE-B1”

Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.

Is the measurement value within the SP value?

YES

>> GO TO 25.

NO

>> Less than the SP value: Replace malfunctioning mass air flow sensor, and then GO TO 27.

25.

CHECK INTAKE SYSTEM

Check for the cause of air leakage after the mass air flow sensor. Refer to the following.
• Disconnection, looseness, and cracks in air duct
• Looseness of oil filler cap
• Disconnection of oil level gauge
• Open stuck, breakage, hose disconnection, or cracks in PCV valve
• Disconnection or cracks in EVAP purge hose, stuck open EVAP canister purge volume control solenoid

valve

• Malfunctioning seal in rocker cover gasket
• Disconnection, looseness, or cracks in hoses, such as a vacuum hose, connecting to intake air system parts
• Malfunctioning seal in intake air system, etc.

>> GO TO 27.

26.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2” AND “B/FUEL SCHDL”

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and
check that each indication is within the SP value. 
Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Detect malfunctioning part according to 

EC-524, "Symptom Table"

.

27.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and then check that the indication is within
the SP value.
Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Detect malfunctioning part according to 

EC-524, "Symptom Table"

.

EC-168

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000006217763

1.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check the continuity between ECM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Loose or poor connection for each connector and harness
• Harness for open or short between ECM and ground

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

3.

CHECK ECM POWER SUPPLY CIRCUIT-I

1.

Reconnect ECM harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• 10 A fuse (No. 62)
• Loose or poor connection for each connector and harness
• Harness for open or short between ECM and fuse

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

5.

CHECK ECM POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Check the voltage between ECM harness connector terminals as per the following.

ECM

Ground

Continuity

Connector

Terminal

F111

10

Ground

Existed

E80

174

175

ECM

Voltage

Connector

+

Terminal

Terminal

E80

141

175

Battery voltage

POWER SUPPLY AND GROUND CIRCUIT

EC-169

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

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Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 8.

6.

CHECK ECM POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch ON.

2.

Check the voltage between IPDM E/R harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace IPDM E/R. Refer to 

PCS-32, "Removal and Installation"

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

8.

CHECK ECM POWER SUPPLY CIRCUIT-IV

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Check the voltage between ECM harness connector terminals as per the following.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 9.

9.

CHECK ECM POWER SUPPLY CIRCUIT-V

1.

Disconnect ECM harness connector.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

ECM

Voltage

Connector

+

Terminal

Terminal

E80

171

175

After turning ignition switch OFF, battery 
voltage will exist for a few seconds, then 
drop to approximately 0 V.

172

IPDM E/R

Ground

Voltage

Connector

Terminal

E15

61

Ground

Battery voltage

ECM

Voltage

Connector

+

Terminal

Terminal

E80

163

175

Battery voltage

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E80

163

E14

41

Existed

 

 

 

 

 

 

 

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