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OBDSTAR  |  SKU: M078

OBDSTAR (M078) | Universal 9-pin OBD – 16-pin OBD2 Adapter Cable | Motorboat

€25,95 incl.
€21,45 excl.

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The OBDSTAR M078 is an adapter cable for the 9-pin round OBD diagnostic connector found on marine diesel engines. It connects that connector to the 16-pin OBD2 (J1962)-port on your OBDSTAR diagnostic device, and attaches directly to the engine's diagnostic connector at the motor end.

Various marine diesel engine manufacturers use the same round 9-pin connector instead of a standard OBD2 port. The cable provides signal transmission between the engine system and diagnostic tool, allowing communication protocols such as CAN and K-line to pass through unchanged. It unlocks the engine management system of the diesel motor. Which fault codes, live data and identification information you can subsequently retrieve depends on the support available in OBDSTAR software for the specific engine type and model year.

KEY BENEFITS

✔Four brands on one connector type — Cummins MerCruiser Diesel, Kohler Power Systems, Mercury Diesel and VM Motori all use this round 9-pin connector.
✔Direct signal transmission — CAN and K-line communication pass through without intermediate conversion.
✔Connect without modifications — the cable attaches to the existing diagnostic connector; no changes to the engine are required.
✔For engines without OBD2 port — these diesel engines lack a standard connection point; the cable makes diagnostics possible regardless.

IMPORTANT NOTES

✕Check the part number — OBDSTAR supplies more than one 9-pin marine cable; the brand list and part number determine which version you require.
✕Not for cars or vans — vehicles with a standard OBD2 diagnostic connector fall outside the scope of this product.
✕OBDSTAR only — use with other diagnostic tools is not supported.
✕Cable does not extend coverage — available functions depend on the OBDSTAR software for the specific engine type and model year.

Applications and functionality

Via the 9-pin round connector, you access the engine management system of the marine diesel engine.

Control units you can reach

  • Engine management system: The diesel engine control unit that features the 9-pin round diagnostic connector.
  • Other modules: Whether additional units on board are accessible varies by manufacturer and installation.

What you can do

  • Read fault codes: Retrieve stored and active diagnostic trouble codes (DTC) from the engine management system to identify a fault.
  • Clear fault codes: Remove read fault codes from engine memory after diagnosis and repair.
  • Display live data: Monitor current engine parameters such as engine speed, engine temperature and fuel pressure in real time during operation.
  • Request system identification: Read engine identification data such as the engine number and software version of the engine control unit.
  • Note: What the OBDSTAR software actually supports varies by engine type and model year.

Compatible vehicles and applications

The 9-pin round diagnostic connector is the determining factor, not the engine model. The manufacturers listed below use this connector. OBDSTAR does not specify particular models with model years.

  • Cummins MerCruiser Diesel: Marine diesel engines with 9-pin round diagnostic connector
  • Kohler Power Systems: Marine engines with 9-pin round diagnostic connector
  • Mercury Diesel: Marine diesel engines with 9-pin round diagnostic connector
  • VM Motori: Marine diesel engines with 9-pin round diagnostic connector
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Good to know:The 9-pin round diagnostic connector is typically located directly on or near the engine block of the marine diesel engine; the exact location varies by engine type and manufacturer.Verify that your engine brand is listed above before ordering.

Package contents

  • 1xOBDSTAR (M078) | Universal 9-pin OBD to 16-pin OBD2 Adapter Cable | Marine Engine

Technical specifications

General

The brand of the cable or adapter. It often has to match the brand of your diagnostic tool.Brand
OBDSTAR
The type of product: a separate adapter cable, an adapter without a cable or a complete set.Product type
Adapter cable

Suitable for

The brand of diagnostic tool the cable works with. A cable for one brand usually does not fit a tester of another brand.Compatible diagnostic tool
  • OBDSTAR
Whether the cable needs a separate power connection, for example via battery clamps. A passive cable works without one.Separate power supply required

Connections

The connector that plugs into the diagnostic port of the vehicle or machine. It must fit exactly.Vehicle-side connector
9-pin OBD
The connector on the side of your diagnostic tool or interface. Usually a 16-pin OBD2 connector.Tool-side connector
16-pin OBD2
The data lines through which the cable passes signals. The vehicle and the tester must use the same communication method.Communication
  • K-line
  • CAN-bus

Size and weight

The weight of the cable or adapter.Weight
0.2 kg
Control units
Engine management system

Other specifications

Application
9-pin round diagnostic connector on marine diesel engines
Segment
Marine engine
Supported brands
Cummins MerCruiser Diesel, Kohler Power Systems, Mercury Diesel and VM Motori
Model range
Not limited by model year; determined by the presence of the 9-pin round diagnostic connector
Required to use
OBDSTAR diagnostic device with marine coverage, such as the Marine Master or an iScan variant
Additional requirements
None; the cable operates without adapter or power supply