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
. 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.
.
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-167
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
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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
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-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
D
E
F
G
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EC
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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
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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