Connect directly to supported Yamaha marine applications using HP Tuners’ purpose-built Yamaha OBDII Adapter Cables.

NOTE: These cables are for flashing/writing only. To data log, scan, and diagnose your Yamaha marine application, please see OBDII Adapter Cable – Yamaha 3-Pin.

Overview
Connect directly to supported Yamaha marine applications using HP Tuners’ purpose-built Yamaha Outboard OBDII Adapter Cables.

These marine adapter cables allow professional tuners, marine technicians, and hands-on owners to connect MPVI3 or MPVI4 interfaces to supported Yamaha marine ECMs for calibration writing.

Unlike standard diagnostic adapters, these cables include integrated battery clips that provide stable external power to the ECM during the calibration write process. Supplying power to the ECM is required in marine applications because the engine must remain off during the process.

Whether you are performing calibration work for performance improvements, improved throttle response, or enhanced fuel efficiency, these Yamaha marine adapter cables provide a reliable connection between your HP Tuners interface and the engine’s ECM.

Available Cable Options
This product page includes the following Yamaha outboard flashing cables:

OBDII Adapter Cable – Yamaha Outboard (34 Pin ECU, Style 1)
OBDII Adapter Cable – Yamaha Outboard (34 Pin ECU, Style 2)
OBDII Adapter Cable – Yamaha Outboard (44 Pin ECU, Style 2)
Use the dropdown selector to choose the cable that matches your Yamaha engine’s ECM connector.

Supported Yamaha Marine Applications
Which cable do I need?
Yamaha outboards use different ECM connector styles depending on model and year. Select the tab that matches your engine’s ECU connector to find the correct flashing cable.

These Yamaha outboard engines use the 34-Pin ECU Connector (Style 1) and require the corresponding OBDII Adapter Cable – Yamaha Outboard (34 Pin ECU, Style 1).

Please verify the connector style on your engine before selecting a cable.

Supported Models

2017-2024 F150 2.8L 6HP
2022-2025 F200 2.8L 6LH
2013-2024 F200 2.8L 6DV
2010-2021 F225 4.2L 6CL
2008-2010 F250 3.3L 6BR
2010-2021 F250 4.2L 6CG
2010-2021 F300 4.2L 6CE
2007-2009 F300 4.2L 6BJ
2020-2024 F300 4.2L 6KA
2007-2019 F350 5.3L 6AW

Key Features
Purpose-built Yamaha marine adapter cables
Designed specifically to connect HP Tuners interfaces to supported custom tuning on Yamaha marine ECM.

Integrated ECM power supply
Includes battery alligator clips that provide stable voltage to the ECM during the calibration write process.

Direct connection to supported marine ECMs
Provides reliable communication between MPVI3 or MPVI4 interfaces and Yamaha controllers.

Important Usage Notes
These cables are designed for calibration writing only.
The engine must remain OFF during the calibration write process.
Stable battery voltage must be maintained during calibration writing.
Always verify connector style before selecting a cable.
For diagnostics, use the Yamaha 3-Pin Diagnostic Cable.
Requirements
To use these Yamaha marine flashing cables you will need:

MPVI3 or MPVI4 interface
VCM Suite software
Supported Yamaha Marine Application
In the Box
Yamaha Outboard OBDII Adapter Cable (selected style)
Quick Start Guide
Please click HERE to see our detailed quick start guide.