EC-1
ENGINE CONTROL SYSTEM
B ENGINE
CONTENTS
C
D
E
F
G
H
I
J
K
L
M
SECTION
A
EC
Revision: April 2004 2004 Titan
INDEX FOR DTC ........................................................ 8
Alphabetical Index .................................................... 8
DTC No. Index ....................................................... 12
PRECAUTIONS ........................................................ 16
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................ 16
On Board Diagnostic (OBD) System of Engine and
A/T .......................................................................... 16
Precaution .............................................................. 16
Wiring Diagrams and Trouble Diagnosis ................ 19
PREPARATION ......................................................... 20
Special Service Tools ............................................. 20
Commercial Service Tools ...................................... 22
ENGINE CONTROL SYSTEM .................................. 23
System Diagram ..................................................... 23
Vacuum Hose Drawing ........................................... 24
System Chart ......................................................... 25
Multiport Fuel Injection (MFI) System .................... 26
Electronic Ignition (EI) System ............................... 28
Nissan Torque Demand (NTD) Control System ..... 29
Air Conditioning Cut Control ................................... 30
Fuel Cut Control (at No Load and High Engine
Speed) .................................................................... 30
CAN communication .............................................. 31
BASIC SERVICE PROCEDURE .............................. 32
Idle Speed and Ignition Timing Check .................... 32
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment ............................................................. 33
Accelerator Pedal Released Position Learning ...... 44
Throttle Valve Closed Position Learning ................ 44
Idle Air Volume Learning ........................................ 44
Fuel Pressure Check .............................................. 46
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 49
Introduction ............................................................ 49
Two Trip Detection Logic ........................................ 49
Emission-related Diagnostic Information ................ 50
NVIS (Nissan Vehicle Immobilizer System — NATS)
... 63
Malfunction Indicator Lamp (MIL) ........................... 63
OBD System Operation Chart ................................66
TROUBLE DIAGNOSIS ............................................71
Trouble Diagnosis Introduction ...............................71
DTC Inspection Priority Chart ................................. 76
Fail-safe Chart ........................................................ 77
Basic Inspection ..................................................... 79
Symptom Matrix Chart ............................................84
Engine Control Component Parts Location ............88
Circuit Diagram ....................................................... 94
ECM Harness Connector Terminal Layout ............. 96
ECM Terminals and Reference Value ..................... 96
CONSULT-II Function ...........................................103
Generic Scan Tool (GST) Function .......................115
CONSULT-II Reference Value in Data Monitor .....117
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................120
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .122
Description ............................................................122
Testing Condition ..................................................122
Inspection Procedure ............................................122
Diagnostic Procedure ...........................................123
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .......................................................................126
Description ............................................................126
Diagnostic Procedure ...........................................126
POWER SUPPLY AND GROUND CIRCUIT ...........127
Wiring Diagram .....................................................127
Diagnostic Procedure ...........................................128
Ground Inspection ................................................132
DTC U1000, U1001 CAN COMMUNICATION LINE .134
Description ............................................................134
On Board Diagnosis Logic ....................................134
DTC Confirmation Procedure ...............................134
Wiring Diagram .....................................................135
Diagnostic Procedure ...........................................136
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER .137
Description ............................................................137
CONSULT-II Reference Value in Data Monitor Mode
.137
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