# 864273T07 Mercruiser MX6.2L MPI ECU (0W029410 and below) | Genuine Used Part

🔧 Product Description

  

Genuine MerCruiser MX 6.2L MPI ECM / Engine Control Module - Part Number: 864273T07

  

A genuine Mercury MerCruiser ECM for selected MX 6.2L MPI Bravo petrol sterndrive engines. This module is used on raw-water cooled / standard cooling MX 6.2L MPI applications up to serial number 0W029410, and manages fuel injection, ignition timing, idle control, diagnostics and engine-protection functions.

  

⚙️ Key Features

  

• Genuine Mercury MerCruiser ECM

• Correct Mercury part number 864273T07

• ECM horsepower calibration for 335HP MX 6.2L MPI applications

• Suits MCM MX 6.2L MPI Bravo standard-cooling engines up to serial 0W029410

• Requires exact serial-number and cooling-system confirmation before installation

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 864273T07 → Supersedes 864273T3

• 864273T3 earlier ECM reference

  

OEM / Related Numbers:

  

• 864273T07

• 77-864273T07

• 864273T3

• Related ECM family reference: 864273T06

• Related ECM family reference: 866126T05

• Related ignition / electrical service reference: 8M0054588

• Related harness reference: 84-863656A1

• Related spark plug reference: 33-8M2018369

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser MCM MX 6.2L MPI Bravo petrol sterndrive engines

• Standard-cooling / raw-water cooled MX 6.2L MPI electrical-control systems

  

Typically suits:

  

• Engine models:

• MerCruiser MCM MX 6.2L MPI Bravo - 2001-2002, serial 0M300000 to 0M599999

• MerCruiser MCM MX 6.2L MPI Bravo with standard cooling - 2002-2004, serial 0M600000 to 0W029410

• MerCruiser MX 6.2L MPI 377 CID V8 applications using ECM 864273T07

• MerCruiser 5.0L / 350 MAG / MX 6.2L MPI electrical-component family applications where the MX 6.2L MPI standard-cooling diagram specifies 864273T07

  

• HP Range: approximately 320HP - 335HP depending on exact MX 6.2L calibration

• Engine Type: MerCruiser GM-based 377 CID / 6.2L V8 MPI petrol sterndrive

• Year Range: approximately 2001 - 2004

• Serial Range: 0M300000 to 0W029410 for listed MX 6.2L MPI Bravo applications

• Cooling Type: Standard cooling / raw-water cooled applications where 864273T07 is specified

  

🔌 Function

  

The ECM is the main engine-management module. It processes crank, cam, MAP, throttle, temperature, knock and other sensor inputs, then controls fuel injection, ignition timing, idle strategy, diagnostics and engine-protection functions.

  

Common signs of failure:

  

• No-start with confirmed fuel pressure, ignition inputs and ECM power supply

• No communication with diagnostic equipment

• No injector pulse or no ignition command after harness testing

• Intermittent stalling, shutdown or limp mode

• Persistent ECM-related fault codes after sensor replacement

• Incorrect idle or fuel-control behaviour after mechanical checks

• Water intrusion, corrosion or voltage-damage related module failure

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 700.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Electronic Components | ECU CDI & Electrical Parts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 700.00 AUD | In stock |

## Images

- 864273T07 Mercruiser MX6.2L MPI ECU (0W029410 and below) | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/864273t07-mercruiser-mx6-2l-mpi-ecu-0w029410-and-below-genuine-used-part)
> Updated: 2026-06-29