Mercury 4 pin diagnostics cable

Jaltest JDC603A — Mercury Marine 4-Pin Diagnostics Cable

The JDC603A is a genuine Cojali Jaltest diagnostic cable that connects Mercury marine engines via 4-pin diagnostic connector to the Jaltest marine diagnostic platform. Mercury is one of the most dominant brands in marine outboard engines, and many Mercury outboards use a 4-pin diagnostic port for ECU access. The JDC603A is the specific cable you need when your Jaltest system needs to talk to Mercury engines equipped with this connector type.

Listed in the official Jaltest 2025 pricelist at $70 MSRP, the JDC603A is included in both the Boat Cable Kit (70002008) and the Outboard Cable Kit (70002010), confirming its role as a standard tool for Mercury marine diagnostics on the Jaltest platform.

What This Cable Does

The JDC603A connects to the 4-pin diagnostic port found on compatible Mercury outboard engines and enables:

• Fault code reading and clearing — read stored and active DTCs from Mercury engine ECUs
• Live data monitoring — RPM, engine temperature, fuel trim, throttle position, and other parameters in real time
• Marine diagnostic tests available within the Jaltest Marine outboard software module

Link Version Compatibility

• Jaltest Link V8.1
• Jaltest Link V9

Kit Compatibility

The JDC603A is included in:

• Boat Cable Kit — Part Number 70002008 ($880 MSRP)
• Outboard Cable Kit — Part Number 70002010 ($475 MSRP)
• Inboard Cable Kit — Part Number 70002009 ($580 MSRP)

Cable Specifications

• Part Number: JDC603A
• Manufacturer: Cojali (Jaltest)
• Connector Type: 4-pin Mercury diagnostic connector
• Cable Length: 11 inches (interface adapter)
• Compatible Interface: Jaltest Link V8.1 and V9
• MSRP: $70.00 (2025 Jaltest Pricelist)
• Warranty: 1 year

Who Needs This Cable

Marine service shops, Mercury dealers running Jaltest Marine, and independent technicians who service Mercury outboard and inboard engines. If you already have the Jaltest Marine software and service Mercury-powered boats, this is an essential cable in your kit. Mercury also makes inboard engines under the MerCruiser brand — if you service those too, note that MerCruiser DTS engines use the JDC617A cable; the JDC603A targets the 4-pin outboard connector.

Why Buy From OEM Diagnostic Tools?

Specialist in professional diagnostic tools since 2016. We know the Jaltest marine cable lineup and can help confirm which Mercury cable configuration you need for your specific engine models. Call 866-217-0063 — free shipping, free tech support, full warranty.

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