Infiniti QX4 (R50). Manual — part 137
Engine Fuel & Emission Control System
NBEC0004
SEF952RE
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
PRECAUTIONS
Engine Fuel & Emission Control System
EC-15
SEF289H
Precautions
NBEC0005
I
Before connecting or disconnecting the ECM harness
connector, turn ignition switch OFF and disconnect nega-
tive battery terminal. Failure to do so may damage the
ECM because battery voltage is applied to ECM even if
ignition switch is turned off.
SEF908W
I
When connecting ECM harness connector, fasten it
securely with a lever as far as it will go as shown at left.
SEF291H
I
When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
MEF040D
I
Before replacing ECM, perform “ECM Terminals and Ref-
erence Value” inspection and make sure ECM functions
properly. Refer to EC-127.
SEF217U
I
After performing each TROUBLE DIAGNOSIS, perform
“DTC Confirmation Procedure” or “Overall Function
Check”.
The DTC should not be displayed in the “DTC Confirma-
tion Procedure” if the repair is completed. The “Overall
Function Check” should be a good result if the repair is
completed.
PRECAUTIONS
Precautions
EC-16
SEF348N
I
When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
I
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than the ECM
terminals, such as the ground.
SEF099WB
I
Regarding model R50, “-B1” indicates the right bank and
“-B2” indicates the left bank as shown in the figure.
I
Bank 1 includes No. 1 cylinder.
Wiring Diagrams and Trouble Diagnosis
NBEC0006
When you read Wiring diagrams, refer to the following:
I
GI-34, “HOW TO READ WIRING DIAGRAMS”
I
EL-9, “POWER SUPPLY ROUTING” for power distribution circuit
When you perform trouble diagnosis, refer to the following:
I
GI-38, “HOW TO FOLLOW TEST GROUP IN TROUBLE DIAGNOSIS”
I
GI-34, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
PRECAUTIONS
Precautions (Cont’d)
EC-17
Special Service Tools
NBEC0007
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
KV10117100
(J36471-A)
Front heated oxygen
sensor wrench
Rear heated oxygen
sensor wrench
NT379
Loosening or tightening front and rear heated oxy-
gen sensors with 22 mm (0.87 in) hexagon nut
(J44321)
Fuel pressure adapter
and gauge kit
SEF326Z
Checking fuel pressure with pressure gauge
Commercial Service Tools
NBEC0008
Tool name
(Kent-Moore No.)
Description
Leak detector
(J41416)
NT703
Locating the EVAP leak
EVAP service port
adapter
(J41413-OBD)
NT704
Applying positive pressure through EVAP service
port
Fuel filler cap adapter
NT653
Checking fuel tank vacuum relief valve opening
pressure
PREPARATION
Special Service Tools
EC-18
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