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 2) and require the OBDII Adapter Cable – Yamaha Outboard (34 Pin ECU, Style 2).

Please confirm the ECU connector style on your engine prior to purchase.

Supported Models

2005-2025 F50 1.0L 6C1
2005-2024 F60 1.0L 6C5
2010-2024 F70 1.0L 6CJ
2005-2017 F75 1.6L 6D6
2005-2017 F90 1.6L 6D8
2011-2014 F115 1.8L 68V
2014-2025 F115 1.8L 6EK

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.