NISSAN ALMERA N16 2003 Electronic Repair Manual

Engine Fuel & Emission Control SystemNJEC0602
SEF433Z
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PRECAUTIONSYD
Engine Fuel & Emission Control System
EC-7

SEF289H
PrecautionsNJEC0603Before 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.
SEF881Y
When connecting ECM harness connectors, push in both
sides of the connector until you hear a click. Maneuver the
lever until you hear the three connectors on the inside
click. Refer to the figure at left.
SEF291H
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
Before replacing ECM, perform Terminals and Reference
Value inspection and make sure ECM functions properly.
Refer to EC-66.
SAT652J
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.
PRECAUTIONSYD
Precautions
EC-8

SEF348N
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.
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 ECM terminals,
such as the ground.
Install the break-out box between ECM and ECM harness
connectors when measuring ECM input/output voltage.
Wiring Diagrams and Trouble DiagnosisNJEC0604When you read Wiring diagrams, refer to the following:
GI-12, “HOW TO READ WIRING DIAGRAMS”
EL-12, “POWER SUPPLY ROUTING” for power distribution circuit
When you perform trouble diagnosis, refer to the following:
GI-33, “HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES”
GI-22, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”
GI
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PRECAUTIONSYD
Precautions (Cont’d)
EC-9

Special Service ToolsNJEC0605
Tool number
Tool nameDescription
KV111060S0
Removal/Installation tool
kit for fuel injection pump
NT814
KV109E0010
Break-out box
NT825
KV109E0050
Y-cable adapter
NT826
PREPARATIONYD
Special Service Tools
EC-10

Engine Control Component Parts LocationNJEC0607
NEF396A
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ENGINE AND EMISSION CONTROL OVERALL SYSTEMYD
Engine Control Component Parts Location
EC-11

SEF894Y
ENGINE AND EMISSION CONTROL OVERALL SYSTEMYD
Engine Control Component Parts Location (Cont’d)
EC-12

NEF376A
GI
MA
EM
LC
FE
CL
MT
AT
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SU
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ST
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BT
HA
SC
EL
IDX
ENGINE AND EMISSION CONTROL OVERALL SYSTEMYD
Engine Control Component Parts Location (Cont’d)
EC-13

Circuit DiagramNJEC0608
YEC320A
ENGINE AND EMISSION CONTROL OVERALL SYSTEMYD
Circuit Diagram
EC-14

System DiagramNJEC0609
YEC399A
GI
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ENGINE AND EMISSION CONTROL OVERALL SYSTEMYD
System Diagram
EC-15

System ChartNJEC0611
Input (Sensor) ECM Function Output (Actuator)
Electronic control fuel injection pump
Crankshaft position sensor (TDC)
Engine coolant temperature sensor
Accelerator position sensor
Accelerator position switch
Park/Neutral position (PNP) switch*
Ignition switch
Battery voltage
Vehicle speed sensor
Air conditioner switch
Mass air flow sensor
Stop lamp switchFuel injection controlElectronic control fuel injection
pump
Fuel injection timing controlElectronic control fuel injection
pump
Fuel cut controlElectronic control fuel injection
pump
Glow control system Glow relay & glow lamp
On board diagnostic system MI (On the instrument panel)
EGR volume control EGR volume control valve
Cooling fan control Cooling fan relay
Air conditioning cut control Air conditioner relay
*: If so equipped
ENGINE AND EMISSION CONTROL OVERALL SYSTEMYD
System Chart
EC-16