Infiniti QX56 (Z62). Manual — part 630
EC-498
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
FUEL INJECTOR
FUEL INJECTOR
Component Function Check
INFOID:0000000006218002
1.
INSPECTION START
Turn ignition switch to START.
Are any cylinders ignited?
YES
>> GO TO 2.
NO
>> Proceed to
.
2.
CHECK FUEL INJECTOR FUNCTION
WITH CONSULT-III
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
3.
Check that each circuit produces a momentary engine speed drop.
WITHOUT CONSULT-III
1.
Start engine.
2.
Listen to each fuel injector operating sound.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000006218003
1.
CHECK FUEL INJECTOR POWER SUPPLY
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform the trouble diagnosis for power supply circuit. Refer to
.
2.
CHECK FUEL INJECTOR CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector harness connector and ECM harness connector.
3.
Check the continuity between fuel injector harness connector and ECM harness connector.
Clicking sound should be heard.
PBIB3332E
+
−
Voltage
ECM
Connector
Terminal
F111
46
Ground
Battery voltage
51
E80
111
112
FUEL INJECTOR
EC-499
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
4.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK ECM GROUND CIRCUIT
Check the continuity between ECM harness connector and ground.
Is inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK FUEL INJECTOR
EC-499, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
NO
>> Replace malfunctioning fuel injector. Refer to
EM-49, "Removal and Installation"
Component Inspection
INFOID:0000000006218004
1.
CHECK FUEL INJECTOR
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector harness connector.
3.
Check the resistance between fuel injector terminals as per the following.
Cylinder
+
−
Continuity
Fuel injector
ECM
Connector
Terminal
Connector
Terminal
1
F123
1
F110
101
Existed
2
108
2
F124
1
F111
7
2
4
3
F125
1
F111
6
2
3
4
F126
1
F110
107
2
104
5
F127
1
F111
2
2
9
6
F128
1
F110
102
2
109
7
F129
1
F110
106
2
103
8
F130
1
F111
1
2
8
+
−
Continuity
ECM
Connector
Terminal
F111
5
Ground
Exsisted
E80
114
115
EC-500
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
FUEL INJECTOR
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning fuel injector. Refer to
EM-49, "Removal and Installation"
.
Injector
Condition
Resistance
+
−
Terminal
1
2
Temperature
10 - 60
°
C (50 - 140
°
F)
1.44 - 1.73
Ω
HIGH PRESSURE FUEL PUMP
EC-501
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
HIGH PRESSURE FUEL PUMP
Component Function Check
INFOID:0000000006218005
1.
CHECK HIGH PRESSURE FUEL PUMP FUNCTION
WITH CONSULT-III
1.
Start engine.
2.
Check “FUEL PRES SEN V” in “DATA MONITOR” mode with CONSULT-III.
WITHOUT CONSULT-III
1.
Start engine.
2.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000006218006
1.
CHECK HIGH PRESSURE FUEL PUMP SOLENOID CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and high pressure fuel pump harness connector.
3.
Check the continuity between ECM harness connector and high pressure fuel pump harness connector.
Monitor Item
Condition
Values/Status
FUEL PRES SEN V
Engine speed: Idle
980 – 1,200 mV
Engine speed: Revving engine from idle to 4,000 rpm
quickly
1,100 – 2,900 mV
ECM
Condition
Voltage
+
−
Connector
Terminal
Connector
Terminal
F110
105
E80
175
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle
BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
BATTERY VOLTAGE
(11 - 14 V)
JPBIA3340ZZ
JPBIA3341ZZ
+
−
Continuity
ECM
High pressure fuel pump
Connector
Terminal
Connector
Terminal
F110
105
F24
1
Existed
110
2
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