ENGINE CONTROL SYSTEM
SECTION
EC
CONTENTS
TROUBLE DIAGNOSIS ? INDEX..................................8
Alphabetical & P No. Index for DTC ...........................8
PRECAUTIONS .............................................................14
Supplemental Restraint System (SRS) ??AIR
BAG?? and ??SEAT BELT PRE-TENSIONER??.............14
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T.........................................14
Engine Fuel & Emission Control System..................15
Precautions................................................................16
Wiring Diagrams and Trouble Diagnosis...................17
PREPARATION .............................................................18
Special Service Tools ................................................18
Commercial Service Tools.........................................18
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.........................................................................20
Engine Control Component Parts Location...............20
Circuit Diagram..........................................................24
System Diagram........................................................25
Vacuum Hose Drawing..............................................26
System Chart.............................................................27
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION...............................................28
Multiport Fuel Injection (MFI) System .......................28
Electronic Ignition (EI) System..................................30
Air Conditioning Cut Control......................................31
Fuel Cut Control (at no load & high engine
speed)........................................................................32
Evaporative Emission System...................................32
On Board Refueling Vapor Recovery (ORVR)..........38
Positive Crankcase Ventilation..................................47
BASIC SERVICE PROCEDURE...................................49
Fuel Pressure Release..............................................49
Fuel Pressure Check.................................................49
Fuel Pressure Regulator Check................................50
Injector.......................................................................51
How to Check Idle Speed and Ignition Timing..........52
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment.................................................................53
Idle Air Volume Learning ...........................................67
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION...............................................................69
Introduction................................................................69
Two Trip Detection Logic...........................................69
Emission-related Diagnostic Information...................70
Malfunction Indicator Lamp (MIL)..............................84
OBD System Operation Chart...................................85
CONSULT-II...............................................................91
Generic Scan Tool (GST) ........................................105
TROUBLE DIAGNOSIS ? INTRODUCTION .............107
Introduction..............................................................107
Work Flow................................................................109
TROUBLE DIAGNOSIS ? BASIC INSPECTION.......111
Basic Inspection.......................................................111
TROUBLE DIAGNOSIS ? GENERAL
DESCRIPTION.............................................................124
DTC Inspection Priority Chart..................................124
Fail-safe Chart.........................................................125
Symptom Matrix Chart.............................................126
CONSULT-II Reference Value in Data Monitor
Mode........................................................................130
Major Sensor Reference Graph in Data Monitor
Mode........................................................................133
ECM Terminals and Reference Value .....................135
TROUBLE DIAGNOSIS ? SPECIFICATION
VALUE..........................................................................143
Description...............................................................143
Testing Condition.....................................................143
Inspection Procedure...............................................143
Diagnostic Procedure ..............................................144
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT.....................................................................147
Description...............................................................147
Diagnostic Procedure ..............................................147
TROUBLE DIAGNOSIS FOR POWER SUPPLY........148
Main Power Supply and Ground Circuit..................148
DTC P0100 MASS AIR FLOW SENSOR (MAFS)......155
Component Description...........................................155
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX