1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16

Table of Contents
Page
Wiring Harness Diagrams . . . . . . . . . . . . . . . 5C-36
MCM 7.4LX / MIE 7.4L Throttle Body Injection
Bluewater Inboard  . . . . . . . . . . . . . . . . . . . . 5C-36
MCM 7.4LX Multi-Port Injection / 454 / 502
Magnum Multi-Port Injection / MIE 454
Page
General Information  . . . . . . . . . . . . . . . . . . . . . 5C-1
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-1
Visual/Physical Inspection  . . . . . . . . . . . . . . 5C-1
Basic Knowledge and Tools Required  . . . . 5C-1
Electrostatic Discharge Damage . . . . . . . . . 5C-1
Diagnostic Information   . . . . . . . . . . . . . . . . . 5C-2
Wiring Harness Service   . . . . . . . . . . . . . . . . 5C-2
Wiring Connector Service . . . . . . . . . . . . . . . 5C-2
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-3
Changes In Terminology . . . . . . . . . . . . . . . . 5C-4
Diagnostic Trouble Codes  . . . . . . . . . . . . . . 5C-4
ECM Self-Diagnostics . . . . . . . . . . . . . . . . . . . . . 5C-5
Diagnostic Code Tool With Malfunction
Indicator Lamp . . . . . . . . . . . . . . . . . . . . . . . . 5C-5
Intermittent Malfunction Indicator Lamp . . . 5C-5
Reading Codes . . . . . . . . . . . . . . . . . . . . . . . . 5C-5
Scan Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-6
EFI Diagnostic Circuit Check  . . . . . . . . . . . . 5C-6
Scan Tool Use with Intermittents . . . . . . . . . 5C-6
Non-Scan Diagnosis of Driveability Concerns
(With No Codes Set)  . . . . . . . . . . . . . . . . . . . 5C-7
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-8
Service Precautions . . . . . . . . . . . . . . . . . . . . 5C-9
Electronic Control Module (ECM)
Tournament Ski Multi-Port Injection /
502
Magnum Multi-Port Injection  . . . . . . . 5C-38
Multi-Port Injection Wiring Diagram
(Chart 1 Of 4) . . . . . . . . . . . . . . . . . . . . . . . . 5C-40
Multi-Port Injection Wiring Diagram
(Chart 2 Of 4) . . . . . . . . . . . . . . . . . . . . . . . . 5C-41
Multi-Port Injection Wiring Diagram
(Chart 3 Of 4) . . . . . . . . . . . . . . . . . . . . . . . . 5C-42
Multi-Port Injection Wiring Diagram
(Chart 4 Of 4) . . . . . . . . . . . . . . . . . . . . . . . . 5C-43
Throttle Body Injection Wiring Diagram
(Chart 1 of 4)  . . . . . . . . . . . . . . . . . . . . . . . . 5C-44
Throttle Body Injection Wiring Diagram
(Chart 2 Of 4) . . . . . . . . . . . . . . . . . . . . . . . . 5C-45
Throttle Body Injection Wiring Diagram
(Chart 3 Of 4) . . . . . . . . . . . . . . . . . . . . . . . . 5C-46
Throttle Body Injection Wiring Diagram
(Chart 4 Of 4) . . . . . . . . . . . . . . . . . . . . . . . . 5C-47
Diagnostic Circuit Check  . . . . . . . . . . . . . . . 5C-49
Scan Tool Normal Specifications
(Idle /Warm Engine/Closed
Throttle/Neutral)  . . . . . . . . . . . . . . . . . . . . 5C-49
No “Malfunction Indicator Lamp” (Marine
Diagnostic Code Tool Installed)  . . . . . . . . 5C-52
No DLC Data or Will Not Flash Code 12
“Malfunction Indicator Lamp” On Steady
(Marine Diagnostic Code Tool Installed)
Chart A-2 (1 of 2)  . . . . . . . . . . . . . . . . . . . . . 5C-54
Engine Cranks but Will Not Run
Chart A-3 (1 of 4)  . . . . . . . . . . . . . . . . . . . . 5C-56
Multi-Port Injection Fuel System Diagnosis
Chart A-7 (1 of 6)  . . . . . . . . . . . . . . . . . . . . . 5C-60
Throttle Body Injection Fuel System
Diagnosis Chart A-7 (1 of 6)  . . . . . . . . . . . 5C-66
EFI System/Ignition Relay Check
and Sensors  . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-10
General Description . . . . . . . . . . . . . . . . . . . 5C-10
Computers and Voltage Signals  . . . . . . . . 5C-10
Analog Signals  . . . . . . . . . . . . . . . . . . . . . . . 5C-10
Digital Signals . . . . . . . . . . . . . . . . . . . . . . . . 5C-11
Engine Control Module (ECM) . . . . . . . . . . 5C-11
Speed Density System  . . . . . . . . . . . . . . . . 5C-12
ECM Input and Sensor Descriptions . . . . . 5C-13
Spark Management . . . . . . . . . . . . . . . . . . . . . 5C-18
High Energy Ignition with Ignition
Control (IC)   . . . . . . . . . . . . . . . . . . . . . . . . . 5C-18
Modes Of Operation  . . . . . . . . . . . . . . . . . . 5C-18
Distributor Module Mode . . . . . . . . . . . . . . . 5C-18
ECM Control Mode  . . . . . . . . . . . . . . . . . . . 5C-18
Base Ignition Timing  . . . . . . . . . . . . . . . . . . 5C-18
Results of Incorrect Operation . . . . . . . . . . 5C-20
Fuel Metering System  . . . . . . . . . . . . . . . . . . 5C-20
General Description . . . . . . . . . . . . . . . . . . . 5C-20
Modes of Operation . . . . . . . . . . . . . . . . . . . 5C-20
Fuel Metering System Components   . . . . . 5C-22
Multi-Port Vapor Separator Tank (VST)  . . 5C-22
Cool Fuel System . . . . . . . . . . . . . . . . . . . . . 5C-23
Throttle Body Injection Components . . . . . 5C-24
Multi-Port Injection Components  . . . . . . . . 5C-26
Throttle Body Assembly  . . . . . . . . . . . . . . . 5C-27
ECM Connector and Symptom Charts  . . . 5C-29
ECM Connector and EFI Symptoms Chart
(1
of 2)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-72
Ignition System Check (1 of 2) . . . . . . . . . . 5C-74
Ignition System Check (2 of 2) . . . . . . . . . . 5C-76
Idle Air Control (IAC) Functional Test
(1
of 2)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-78
Lanyard Stop Circuit Check (Emergency Stop)
Circuit Check (1 of 2) . . . . . . . . . . . . . . . . . . 5C-80
Audio Warning Buzzer Circuit Check
(1
of 2)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-82
Discrete Input Circuit Check
(Power Reduction Mode) (Non-Scan)
(1
of 2)  . . . . . . . . . . . . . . . . . . . . . . . . . . .
5C-84
Diagnostics-Without Scan Tool . . . . . . . . . . 5C-86
Code 14: Engine Coolant Temperature (ECT)
Sensor Circuit (Non-Scan) (1 of 2)  . . . . . . 5C-86
Code 21: Throttle Position (TP) Sensor Circuit
(Non-Scan) (1 Of 2) . . . . . . . . . . . . . . . . . . . 5C-88
Code 23: Intake Air Temperature (IAT) Sensor
Circuit (Non-Scan)
(J-1 Circuits)  . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-30
ECM Connector and EFI Symptoms Chart
(J-2 Circuits)  . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-33
Multi Port Injector Balance Test . . . . . . . . . 5C-34
Fuel Injector Balance Test Set-up
(Multi-Port Injection)  . . . . . . . . . . . . . . . . . . 5C-35
(1
Of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C-90
Code 33: Manifold Absolute Pressure (MAP)
Sensor Circuit (Non-Scan) (1 Of 2) . . . . . . 5C-92
Code 42: Ignition Control (IC) Circuit
(Non-Scan) (1 of 2) . . . . . . . . . . . . . . . . . . . 5C-94
Index
5C-–2 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2  796
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1993, 1994, 1995, 1996, 1997
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(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews.
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1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 SKU UPC Model
Nick on Aug 13, 2018. Exactly what I was looking for!

Hugely helpful service manual! Perfect. Thank you!
Sonthaya Traipug on May 04, 2018. Freelance Yachts Service

Manuals are all Important for Technician
Glenn on Dec 02, 2015. Nice

This book is invaluable if you do your own repairs. Great book.
Joseph on Oct 04, 2015. 1997 7.4l Bravo

Could not find a copy until a search brought me here.
Excellent print.
Thank you

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