Nissan Primera P11. Instruction — part 203
Engine Fuel & Emission Control System
NCEC0004
SEF331WB
PRECAUTIONS
SR20DE
Engine Fuel & Emission Control System
EC-11
Precautions
NCEC0005
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.
I
When
connecting
or
disconnecting
ECM
harness
connector, use lever as shown.
When connecting, fasten connector securely with lever
moved until it stops.
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 terminals when connecting pin connectors.
I
Before replacing ECM, perform Terminals and Reference
Value inspection and make sure ECM functions properly.
Refer to EC-SR-103.
I
After performing each TROUBLE DIAGNOSIS, perform
“Overall Function Check” or “DTC Confirmation Proce-
dure”.
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.
SEF289H
SEF908W
SEF291H
MEF040D
SAT652J
PRECAUTIONS
SR20DE
Precautions
EC-12
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.
Wiring Diagrams and Trouble Diagnosis
NCEC0006
When you read Wiring diagrams, refer to the followings:
I
“HOW TO READ WIRING DIAGRAMS” in GI section
I
“POWER SUPPLY ROUTING” for power distribution circuit in
EL section
When you perform trouble diagnosis, refer to the followings:
I
“HOW TO FOLLOW TEST GROUP IN TROUBLE DIAGNO-
SIS” in GI section
I
“HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN
ELECTRICAL INCIDENT” in GI section
SEF348N
PRECAUTIONS
SR20DE
Precautions (Cont’d)
EC-13
Special Service Tools
NCEC0007
Tool number
Tool name
Description
KV10117100
Heated oxygen sensor
wrench
NT379
Loosening or tightening heated oxygen sensor 1
(front) with 22 mm (0.87 in) hexagon nut
KV10114400
Heated oxygen sensor
wrench
NT636
Loosening or tightening heated oxygen sensor 2
(rear)
a: 22 mm (0.87 in)
Commercial Service Tool
NCEC0008
Tool name
Description
Fuel filler cap adapter
NT653
Checking fuel tank vacuum relief valve opening
pressure
PREPARATION
SR20DE
Special Service Tools
EC-14
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