EC-1
ENGINE CONTROL SYSTEM
B ENGINE
CONTENTS
C
D
E
F
G
H
I
J
K
L
M
SECTION EC
A
EC
ENGINE CONTROL SYSTEM
QR (WITH EURO-OBD)
INDEX FOR DTC ...................................................... 19
Alphabetical Index .................................................. 19
DTC No. Index ....................................................... 21
PRECAUTIONS ........................................................ 24
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................ 24
On Board Diagnostic (OBD) System of Engine and
A/T .......................................................................... 24
Precaution .............................................................. 24
Wiring Diagrams and Trouble Diagnosis ................ 27
PREPARATION ......................................................... 28
Special Service Tools ............................................. 28
Commercial Service Tools ...................................... 29
ENGINE CONTROL SYSTEM .................................. 30
System Diagram ..................................................... 30
Vacuum Hose Drawing ........................................... 32
System Chart ......................................................... 34
Multiport Fuel Injection (MFI) System .................... 34
Electronic Ignition (EI) System ............................... 37
Air Conditioning Cut Control ................................... 37
Fuel Cut Control (at No Load and High Engine
Speed) .................................................................... 38
CAN Communication Unit ...................................... 38
BASIC SERVICE PROCEDURE .............................. 44
Idle Speed and Ignition Timing Check .................... 44
Accelerator Pedal Released Position Learning ...... 45
Throttle Valve Closed Position Learning ................ 46
Idle Air Volume Learning ........................................ 46
Fuel Pressure Check .............................................. 48
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 51
Introduction ............................................................ 51
Two Trip Detection Logic ........................................ 51
Emission-related Diagnostic Information ................ 52
NATS (Nissan Anti-theft System) ........................... 64
Malfunction Indicator (MI) ....................................... 64
OBD System Operation Chart ................................ 67
TROUBLE DIAGNOSIS ............................................ 73
Trouble Diagnosis Introduction ............................... 73
DTC Inspection Priority Chart .................................76
Fail-safe Chart ........................................................77
Basic Inspection .....................................................79
Symptom Matrix Chart ............................................84
Engine Control Component Parts Location ............88
Circuit Diagram .......................................................93
ECM Harness Connector Terminal Layout .............95
ECM Terminals and Reference Value .....................95
CONSULT-II Function ...........................................102
Generic Scan Tool (GST) Function .......................112
CONSULT-II Reference Value in Data Monitor Mode
.114
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................116
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .119
Description ............................................................119
Testing Condition ..................................................119
Inspection Procedure ............................................119
Diagnostic Procedure ...........................................120
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .......................................................................123
Description ............................................................123
Diagnostic Procedure ...........................................123
POWER SUPPLY AND GROUND CIRCUIT ...........124
Wiring Diagram .....................................................124
Diagnostic Procedure ...........................................125
Component Inspection ..........................................131
Ground Inspection ................................................131
DTC U1000, U1001 CAN COMMUNICATION LINE .132
Description ............................................................132
On Board Diagnosis Logic ....................................132
DTC Confirmation Procedure ...............................132
Wiring Diagram .....................................................133
Diagnostic Procedure ...........................................134
DTC P0011 IVT CONTROL .....................................135
Description ............................................................135
CONSULT-II Reference Value in Data Monitor Mode
.135
On Board Diagnosis Logic ....................................136
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