Infiniti M35/M45 Y50. Manual — part 729
FUEL INJECTOR
EC-1389
[VK45DE]
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EC
FUEL INJECTOR
PFP:16600
Component Description
NBS005PV
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-II Reference Value in Data Monitor Mode
NBS005PW
Specification data are reference values.
SEF375Z
MONITOR ITEM
CONDITION
SPECIFICATION
B/FUEL SCHDL
See
EC-847, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"
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-1390
[VK45DE]
FUEL INJECTOR
Wiring Diagram
NBS005PX
TBWT1505E
FUEL INJECTOR
EC-1391
[VK45DE]
C
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EC
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
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.)
Diagnostic Procedure
NBS005PY
1.
INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited?
Yes or No
Yes
>> GO TO 2.
No
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
21
22
23
40
41
42
44
63
W/B
R/Y
R/B
V/R
P/L
R/W
O
G/Y
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-1392
[VK45DE]
FUEL INJECTOR
2.
CHECK OVERALL FUNCTION
With CONSULT-II
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.
3.
Make sure that each circuit produces a momentary engine
speed drop.
Without CONSULT-II
1.
Start engine.
2.
Listen to each fuel injector operating sound.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.
PBIB0133E
Operating sound should exist.
PBIB1986E
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