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Section 7 - Troubleshooting
Page 126 90-879172181
eng
FEBRUARY 2011
Diagnosing Electronically Controlled Fuel System Problems
Your Cummins MerCruiser Diesel Authorized Repair Facility has the proper service tools for diagnosing problems on electronically
controlled fuel systems. The Engine Control Module (ECM) on these engines has the ability to detect some problems with the
system when they occur, and store a trouble code in the ECM's memory. This code can then be read later by a service technician
using a special diagnostic tool.
Electrical Connections
IMPORTANT: To avoid damage to the electrical system, refer to the following precautions when working on or around the electrical
harness or when adding other electrical accessories.
•
Do not tap accessories into the engine harness.
• Do not puncture wires for testing (probing).
• Do not reverse the battery leads.
• Do not splice wires into the harness.
• Do not route harness near sharp edges, hot surfaces, or moving parts.
• Fasten cables away from and sharp edges, fasteners, or objects that could wear into the harness or pinch the harness.
• Avoid sharp bends in a data harness. Minimum bend radius should be 76 mm (3 in.) for installation.
• Fasten harnesses to the boat at least every 45.7 cm (18 in.), using appropriate fasteners.
• Do not attempt diagnostics without the proper, approved service tools.
• Disconnect all the negative (–) and positive (+) battery cables from each battery before electric arc welding on the vessel.
Attach the welder ground cable no more than 0.61 m (2 ft.) from the part being welded. Do not connect the ground cable of
the welder to any ECM cooling plate or ECM. To avoid damage to the engine or drive and related components, welding on
the engine, drive, or engine and drive mounted components is not recommended.
Troubleshooting Engine Related Problems
Troubleshooting engine related problems may require information not found in these troubleshooting charts. Additional
troubleshooting information can be found in the owners manual for the engine. Refer to the appropriate
Marine Operation and
Maintenance Manual
provided with the engine.
Check VesselView First
Your VesselView display is the primary information source for the various functions of your boat. Consult the VesselView display
if you suspect something is wrong. VesselView displays faults and other information that can be helpful in determining the current
status of various systems and the solution to the problem that could be causing your concern.
If a Check Engine message appears on VesselView, the active engine malfunction fault code will be displayed in place of the hour
meter on the VesselView display. This information can be helpful when contacting an Authorized CMD Repair Facility.
VesselView Malfunction Fault Code List
This malfunction fault code list may assist you if a problem occurs and you must contact the CMD repair facilities.
IMPORTANT: Your Authorized Cummins MerCruiser Diesel Repair Facility will have additional service tools to aid in further
diagnosis of the problem.