Mercury MerCruiser MCM 7.4L MPI User Manual

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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Index

Mercury MerCruiser MCM 7.4L MPI Specifications

General

Brand	Mercury
Model	MerCruiser MCM 7.4L MPI
Category	Engine
Language	English