ENGINE CONTROL SYSTEM
SECTIONEC
CONTENTS
QG18DE (EXC CALIF CA)
TROUBLE DIAGNOSIS - INDEX ..................................22
Alphabetical & P No. Index for DTC .........................22
PRECAUTIONS .............................................................28
Supplemental Restraint System (SRS) ″AIR
BAG″ and ″SEAT BELT PRE-TENSIONER″ .............28
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T.........................................28
Precautions ................................................................29
Wiring Diagrams and Trouble Diagnosis...................31
PREPARATION .............................................................32
Special Service Tools ................................................32
Commercial Service Tools .........................................32
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.........................................................................34
Engine Control Component Parts Location...............34
Circuit Diagram..........................................................39
System Diagram ........................................................41
Vacuum Hose Drawing ..............................................42
System Chart .............................................................43
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION ...............................................44
Multiport Fuel Injection (MFI) System .......................44
Distributor Ignition (DI) System .................................46
Air Conditioning Cut Control......................................47
Fuel Cut Control (at no load & high engine
speed) ........................................................................48
Evaporative Emission System...................................48
On Board Refueling Vapor Recovery (ORVR) ..........55
Positive Crankcase Ventilation ..................................65
BASIC SERVICE PROCEDURE ...................................67
Fuel Pressure Release ..............................................67
Fuel