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Mercury V8 250

Mercury V8 250
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DIAGNOSTIC
MANUAL
V6 175
/
200
/
225 V8 200
/
225
/
250
/
300 FourStroke Outboard
www.brunswick-marine.com
Parc Industriel de Petit-Rechain
B-4800 Verviers, Belgium
90-8M0146617 JULY 2018
90-8M0146617
JULY 2018
www.mercurymarine.com.au
41-71 Bessemer Drive
Dandenong South, Victoria 3175 Australia
www.mercurymarine.com
P.O. Box 1939
Fond du Lac, WI 54936-1939 USA
© Mercury Marine. All rights reserved.
Printed in U.S.A.
DIAGNOSTIC MANUAL
V6 175
/
200
/
225
V8 200
/
225
/
250
/
300
FourStroke
Outboard
Starting serial number 2B529482

Table of Contents

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Mercury V8 250 Specifications

General IconGeneral
Engine TypeV8
Horsepower250 HP
Displacement4.6L
Fuel Induction SystemElectronic Fuel Injection (EFI)
SteeringHydraulic Steering
Gear Ratio1.75:1
Cylinders8
StartingElectric Start
Full Throttle RPM Range5200-6000 RPM
Alternator Amp85 amp
Shaft Length25 in
Weight527 lbs
Fuel TypeUnleaded 87 octane minimum

Summary

Important Information

General Service Precautions When Working on EFI Systems

Outlines essential safety practices for working on EFI systems to prevent injury or damage.

PCM 112

PCM 112 Important Information and Pinouts

Covers essential PCM 112 details, including pinouts for connectors A, B, and C.

PCM 112 and Engine Control Overview

Explains PCM operation, fault detection, data fields, and closed-loop control status.

General Troubleshooting and CDS G3

Troubleshooting with the Computer Diagnostic System (CDS G3)

Guides on connecting and using the CDS G3 diagnostic tool for troubleshooting.

CDS G3-Live Data

Explains how to interpret real-time engine data displayed on the CDS G3 screen.

Fault Codes

Fault Codes

Lists and explains Mercury universal fault codes (UFC) and their meanings.

Electrical Systems

Fuel System

Troubleshooting and Diagnostics

Provides procedures for troubleshooting fuel system components like antisiphon valves and fuel pumps.

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