Infiniti FX35 / FX45. Manual — part 597
FUEL INJECTOR
EC-1149
< SERVICE INFORMATION >
[VK45DE]
C
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E
F
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EC
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P
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FUEL INJECTOR
Component Description
INFOID:0000000001327051
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000001327052
Specification data are reference values.
SEF375Z
MONITOR ITEM
CONDITION
SPECIFICATION
B/FUEL SCHDL
See
INJ PULSE-B1
INJ PULSE-B2
• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load
Idle
2.0 - 3.0 msec
2,000 rpm
1.9 - 2.9 msec
EC-1150
< SERVICE INFORMATION >
[VK45DE]
FUEL INJECTOR
Wiring Diagram
INFOID:0000000001327053
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.
CAUTION:
TBWM1362E
FUEL INJECTOR
EC-1151
< SERVICE INFORMATION >
[VK45DE]
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F
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EC
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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis Procedure
INFOID:0000000001327054
1.
INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited?
Yes or No
Yes (With CONSULT-III)>>GO TO 2.
Yes (Without CONSULT-III)>>GO TO 3.
No
>> GO TO 3.
2.
CHECK OVERALL FUNCTION
With CONSULT-III
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
3.
Make sure that each circuit produces a momentary engine speed drop.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.
3.
CHECK FUNCTION OF FUEL INJECTOR-I
Without CONSULT-III
1.
Turn ignition switch OFF.
2.
Disconnect harness connector F21, F201 (Bank 1) and F41, F221 (Bank 2).
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
21
22
23
40
41
42
44
63
W
R
P
PU
BR
B
OR
G
Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2
Fuel injector No. 7
Fuel injector No. 8
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
BATTERY VOLTAGE
(11 - 14V)
PBIB0042E
PBIB0043E
EC-1152
< SERVICE INFORMATION >
[VK45DE]
FUEL INJECTOR
3.
Turn ignition switch ON.
4.
Check voltage between the following;
harness connector F21 terminal 5 and ground,
harness connector F41 terminal 5 and ground.
5.
Turn ignition switch OFF.
6.
Disconnect ECM harness connector.
7.
Check harness continuity between the following terminals.
8.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M82, F102
• Harness connectors F21, F201
• Harness connectors F41, F221
• Fuse block (J/B) connector M1
• 15A fuse
• Harness for open or short between harness connector F21 and fuse
• Harness for open or short between harness connector F41 and fuse
• Harness for open or short between harness connector F21 and ECM
• Harness for open or short between harness connector F41 and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK FUNCTION OF FUEL INJECTOR-II
: Vehicle front
1.
Harness connectors F41, F221
2.
Harness connectors F21, F201
Voltage: Battery voltage
Cylinder
Harness connector terminal
ECM terminal
1
F21 terminal 3
23
3
F21 terminal 2
22
5
F21 terminal 1
21
7
F21 terminal 6
44
2
F41 terminal 3
42
4
F41 terminal 2
41
6
F41 terminal 1
40
8
F41 terminal 6
63
Continuity should exist.
PBIB3248E
PBIB0180E
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