Mercury MerCruiser MCM 454 Mag MPI, Service Manual

Page: 460 / 1027

5
B
MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5B-1
FUEL SYSTEM
Section 5B - Multi-Port Fuel Injection Descriptions And
System Operation
Table of Contents
Identification 5B-2 . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Control Module (ECM) 5B-2 . . .
General Information 5B-3 . . . . . . . . . . . . . . . . .
Introduction 5B-3 . . . . . . . . . . . . . . . . . . . . . .
Visual / Physical Inspection 5B-3 . . . . . . . .
Basic Knowledge and Tools Required 5B-3
Electrostatic Discharge Damage 5B-4 . . . .
Diagnostic Information 5B-4 . . . . . . . . . . . .
Wiring Harness Service 5B-4 . . . . . . . . . . .
Wiring Connector Service 5B-5 . . . . . . . . . .
Abbreviations 5B-6 . . . . . . . . . . . . . . . . . . . . . . .
ECM Self-Diagnostics 5B-7 . . . . . . . . . . . . . . . .
Diagnostic Code Tool With Malfunction
Indicator Lamp
5B-7 . . . . . . . . . . . . . . . . . .
Intermittent Malfunction Indicator
Lamp
5B-8 . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading Codes 5B-8 . . . . . . . . . . . . . . . . . . .
Scan Tools 5B-9 . . . . . . . . . . . . . . . . . . . . . . .
EFI Diagnostic Circuit Check 5B-9 . . . . . . .
Scan Tool Use With Intermittents 5B-10 . . .
Non-Scan Diagnosis of Driveability
Concerns (With No Codes Set)
5B-11 . . . .
Special Tools 5B-12 . . . . . . . . . . . . . . . . . . . . . . .
Precautions 5B-13 . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Control Module (ECM) and
Sensors
5B-15 . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Description 5B-15 . . . . . . . . . . . . . . .
Computers and Voltage Signals 5B-15 . . . .
Analog Signals 5B-15 . . . . . . . . . . . . . . . . . . .
Digital Signals 5B-16 . . . . . . . . . . . . . . . . . . . .
Engine Control Module (ECM) 5B-18 . . . . . .
Speed Density System 5B-19 . . . . . . . . . . . .
ECM Input and Sensor Descriptions 5B-20 .
Engine Control Module (ECM) and
Delco EST Distributor System
5B-25 . . . . .
Spark Management 5B-27 . . . . . . . . . . . . . . . . . .
High Energy Ignition with Ignition
Control (IC)
5B-27 . . . . . . . . . . . . . . . . . . . . .
Modes Of Operation 5B-27 . . . . . . . . . . . . . .
Distributor Module Mode 5B-29 . . . . . . . . . . .
ECM Control Mode 5B-29 . . . . . . . . . . . . . . .
Base Ignition Timing 5B-30 . . . . . . . . . . . . . .
Results of Incorrect Operation 5B-32 . . . . . .
Fuel Metering System 5B-33 . . . . . . . . . . . . . . . .
General Description 5B-33 . . . . . . . . . . . . . . .
Cool Fuel Systems 5B-33 . . . . . . . . . . . . . . . .
Modes of Operation 5B-33 . . . . . . . . . . . . . . .
454/502 Mag MPI and 8.2L MPI
Multi-Port Injection Components
5B-35 . . .
7.4L MPI Multi-Port Injection
Components
5B-39 . . . . . . . . . . . . . . . . . . . .
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