Infiniti QX4 (R50). Manual — part 287
5
RETEST OVERALL FUNCTION
1. Reconnect harness connectors disconnected.
2. Perform Test No. 1 again.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 6.
6
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
OK or NG
OK
©
Replace VIAS control solenoid valve as intake manifold collector assembly.
NG
©
Repair or replace harness or connectors.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
Diagnostic Procedure (Cont’d)
EC-615
SEF375Z
Component Description
NBEC0383
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the injector circuit, the coil in the injector is
energized. The energized coil pulls the needle valve back and
allows fuel to flow through the injector into the intake manifold. The
amount of fuel injected depends upon the injection pulse duration.
Pulse duration is the length of time the injector remains open. The
ECM controls the injection pulse duration based on engine fuel
needs.
CONSULT-II Reference Value in Data Monitor
Mode
NBEC0384
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
INJ PULSE-B2
INJ PULSE-B1
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
2.4 - 3.2 msec
2,000 rpm
1.9 - 2.8 msec
B/FUEL SCHDL
ditto
Idle
2.0 - 3.2 msec
2,000 rpm
1.4 - 2.6 msec
ECM Terminals and Reference Value
NBEC0685
Specification data are reference values and are measured between each terminal and ground.
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
101
102
103
104
105
107
R/B
L/W
R/W
PU/R
R/Y
R/L
Injector No. 1
Injector No. 5
Injector No. 2
Injector No. 6
Injector No. 3
Injector No. 4
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
INJECTOR
Component Description
EC-616
Wiring Diagram
NBEC0386
MEC974C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
INJECTOR
Wiring Diagram
EC-617
Diagnostic Procedure
NBEC0387
1
INSPECTION START
Turn ignition switch to “START”.
Is any cylinder ignited?
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 3.
2
CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-II.
SEF190Y
3. Make sure that each circuit produces a momentary engine speed drop.
Without CONSULT-II
1. Start engine.
2. Listen to each injector operating sound.
MEC703B
Clicking noise should be heard.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 3.
INJECTOR
Diagnostic Procedure
EC-618
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