Mercury 10 pin, diagnostics cable

Jaltest JDC604.9 — Mercury 10-Pin (MEFI 1-4) Diagnostics Cable

The JDC604.9 is a genuine Cojali Jaltest diagnostic cable designed for Mercury marine engines equipped with a 10-pin diagnostic connector and MEFI 1-4 engine management systems. MEFI (Marine Engine Fuel Injection) is the engine control system used in many MerCruiser sterndrive and inboard engines — and the 10-pin connector is the physical interface that requires the JDC604.9 for Jaltest communication.

Listed in the official Jaltest 2025 pricelist at $110 MSRP, this cable is included in both the Boat Cable Kit (70002008) and the Inboard Cable Kit (70002009), which confirms its role in MerCruiser inboard diagnostics. The ".9" suffix indicates compatibility with the Jaltest Link V9 interface.

What MEFI 1-4 Means and Why It Matters

MEFI (Marine Engine Fuel Injection) systems 1 through 4 are ECU generations used in MerCruiser engines spanning roughly the mid-1990s through the mid-2000s. These engines are still widely in service on older but well-maintained boats, and they require the correct 10-pin interface cable for electronic diagnostic access. The JDC604.9 is the cable that covers this connector type — a different cable handles newer Mercury/MerCruiser engines with different connector formats.

What This Cable Does

• Fault code reading and clearing — access stored DTCs from MEFI 1-4 engine control units
• Live data monitoring — view engine parameters including RPM, coolant temp, fuel system data, and MAP sensor readings in real time
• Marine diagnostic tests within the Jaltest Marine inboard/boat software module

Link Version Compatibility

• Jaltest Link V9

Kit Compatibility

The JDC604.9 is included in:

• Boat Cable Kit — Part Number 70002008 ($880 MSRP)
• Inboard Cable Kit — Part Number 70002009 ($580 MSRP)

Cable Specifications

• Part Number: JDC604.9
• Manufacturer: Cojali (Jaltest)
• Connector Type: 10-pin Mercury diagnostic connector (MEFI 1-4)
• Cable Length: 11 inches (interface adapter)
• Compatible Interface: Jaltest Link V9
• MSRP: $110.00 (2025 Jaltest Pricelist)
• Warranty: 1 year

Who Needs This Cable

Marine service shops, MerCruiser dealers, and independent technicians who service boats with MerCruiser inboard or sterndrive engines using MEFI 1-4 management. If you routinely work on boats from the late 1990s and 2000s with MerCruiser power, this cable covers that diagnostic port. Shops building out a comprehensive Mercury/MerCruiser cable kit will want this alongside the JDC603A (4-pin outboard) and JDC617A (DTS) cables to cover the full range.

Why Buy From OEM Diagnostic Tools?

Specialist in professional diagnostic tools since 2016. We can help you identify exactly which Mercury cable(s) your specific engine models require. Call 866-217-0063 — free shipping, free tech support, full warranty, and no guesswork.

Call 866-217-0063 for quick answers and help!