Mercury Optimax PCM ECU | OEM 88555701S / 89790640T | Fits 2003–2006 Mercury Optimax 75 HP 1.5L DFI 3-Cylinder | 246 Hours | 1-Year Warranty

Product Overview

Restore reliable engine performance with this genuine OEM Mercury Optimax PCM (Powertrain Control Module / ECU), designed for 2003–2006 Mercury and Mariner 75 HP 1.5L DFI Optimax 3-cylinder outboards. This factory Mercury PCM has been professionally tested on the engine and verified using a CDI Electronics diagnostic tester to ensure dependable operation before shipment. Removed from a 2005 Mercury 75 HP Optimax donor engine, this PCM has 246 verified engine hours with no active fault codes. A CDI diagnostic report is included with your purchase, and the module is backed by a 1-Year Working Warranty for added peace of mind. Always verify compatibility using your engine's serial number and OEM part number before purchasing.

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Key Features

• Genuine OEM Mercury Optimax PCM / ECU
• Fits 2003–2006 Mercury & Mariner 75 HP 1.5L DFI Optimax outboards
• Professionally engine tested
• CDI Electronics diagnostic tested
• CDI report included
• 246 verified engine hours
• No active fault codes
• No visible damage
• Wiring intact with no cuts, burns, or breaks
• Ready to install
• Backed by a 1-Year Working Warranty

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Technical Specifications

Specification	Details
Brand	Mercury
Product Type	PCM / ECU (Powertrain Control Module)
Condition	Used – Professionally Tested
OEM Part Numbers	88555701S, 885557, 89790640T
Engine Type	Optimax DFI
Displacement	1.5L
Cylinders	3
Engine Cycle	2-Stroke Direct Fuel Injection (DFI)
Horsepower	75 HP

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OEM Part Numbers

Primary Part Numbers

• 88555701S
• 885557
• 89790640T

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Compatible Applications

Designed for select Mercury and Mariner outboards including: Model Years

• 2003
• 2004
• 2005
• 2006

Horsepower

• 75 HP

Engine Type

• Mercury Optimax
• Mariner Optimax
• 1.5L DFI
• 3-Cylinder

Serial Range

• 0T980000 through 1B417701

Donor Engine

• Year: 2005
• Model: 1075D73DD
• Serial Number: 1B191087

PCM Program

• PCM0308M
• Manufactured 03/29/2005

Important: Always verify compatibility using your engine's serial number and OEM part number before purchasing. If you need assistance confirming fitment, contact EZ Boats Marine and we'll be happy to help.

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Condition

This Mercury Optimax PCM has been professionally inspected and tested and is in excellent used condition. Inspection highlights include:

• Tested on the engine prior to removal
• Professionally tested with a CDI Electronics diagnostic tester
• CDI diagnostic report included
• 246 verified engine hours
• No active fault codes
• No visible damage
• Wiring intact with no cuts, burns, or breaks
• Ready for installation

Please review all product photos carefully before purchasing.

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What's Included

Your purchase includes:

• OEM Mercury Optimax PCM / ECU
• CDI Electronics Diagnostic Test Report

Only the components shown in the product photos are included.

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Shipping Information

Your PCM will be carefully packaged to protect sensitive electronic components during shipping. We offer fast shipping throughout the United States, with international shipping available upon request. For an accurate shipping quote, please provide:

• Country
• ZIP or Postal Code
• Residential or Commercial Address
• Whether liftgate service is required

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Why Buy from EZ Boats Marine?

• Genuine OEM Mercury Marine Parts
• Professionally Engine & CDI Tested
• CDI Diagnostic Report Included
• 246 Verified Engine Hours
• 1-Year Working Warranty
• Honest Condition Descriptions
• Fast Nationwide & International Shipping
• Secure Packaging
• Experienced Marine Parts Specialists
• Dedicated Customer Support

EZ Boats Marine is committed to supplying quality OEM marine parts backed by expert service and dependable support.

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Frequently Asked Questions

Is this a genuine Mercury PCM?

Yes. This is an original OEM Mercury Optimax PCM/ECU manufactured by Mercury Marine.

Has this PCM been tested?

Yes. It was tested on the donor engine and verified using a CDI Electronics diagnostic tester. A CDI report showing 246 verified engine hours and no active fault codes is included.

Which engines does it fit?

This PCM fits select 2003–2006 Mercury and Mariner 75 HP 1.5L DFI Optimax 3-cylinder outboards within serial range 0T980000 through 1B417701. Always verify compatibility using your engine's serial number and OEM part number before ordering.

Is this covered by a warranty?

Yes. This PCM is backed by a 1-Year Working Warranty. If it fails during normal use, EZ Boats Marine will replace it or provide a refund if a replacement is unavailable.

Can EZ Boats Marine verify fitment?

Absolutely. Simply send us your Mercury engine's model and serial number, and we'll confirm whether this OEM 88555701S / 89790640T PCM is the correct fit before you purchase.