Section 6 - Troubleshooting
Page 74
90-8M0133679
eng
JUNE 2017
Diagnosing Electronically Controlled Fuel System Problems
A Mercury 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 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.
Troubleshooting Charts
Starter Motor Will Not Crank Engine, or Cranks Slow
Possible Cause
Remedy
Battery switch turned off.
Turn switch on.
Remote control not in neutral position.
Position control lever in neutral.
Open circuit breaker or blown fuse.
Check and reset circuit breaker or replace fuse.
Loose or dirty electrical connections or damaged wiring. Check all electrical connections and wires (especially battery
cables). Clean and tighten faulty connection.
Bad battery.
Test and replace if bad.
Engine Will Not Start, or Is Hard to Start
Possible Cause
Remedy
Lanyard stop switch activated.
Check lanyard stop switch.
Improper starting procedure.
Read starting procedure.
Empty fuel tank or fuel shut‑off valve closed. Fill tank or open valve.
Throttle not operating properly.
Check the throttle for freedom of movement.
Faulty electrical stop‑circuit.
Have a Mercury Diesel authorized repair facility service the electrical stop
circuit.
Clogged fuel filters.
Replace fuel filters.
Stale or contaminated fuel.
Drain tank. Fill with fresh fuel.
Fuel line or tank vent line kinked or clogged. Replace kinked lines or blow out the lines with compressed air to remove
obstruction.
Air in fuel injection system.
Purge fuel injection system.
Faulty wire connections.
Check wire connections.
Electronic fuel system fault.
Have the electronic fuel system checked by a Mercury Diesel authorized repair
facility.
Engine Runs Rough, Misses, or Backfires
Possible Cause
Remedy
Throttle not operating properly.
Check the throttle for binding or an obstruction.
Idle speed too low.
Have idle speed checked and adjusted by a Mercury Diesel authorized
repair facility.
Clogged fuel or air filters.
Replace fuel or air filters.
Stale or contaminated fuel.
If fuel is contaminated, drain tank. Fill with fresh fuel.
Kinked or clogged fuel line or fuel tank vent line. Replace kinked lines or blow out lines with compressed air to remove
obstruction.
Air in fuel system.
Purge fuel injection system.
Electronic fuel system faulty.
Have electronic system checked by a Mercury Diesel authorized repair
facility.
Poor Performance
Possible Cause
Remedy
Throttle not fully open.
Inspect throttle cable and linkages for proper operation.
Damaged or improper propeller.
Replace propeller. See a Mercury Diesel authorized repair facility.
Excessive bilge water.
Drain and check for cause of entry.
Summary of Contents for MerCruiser Diesel Inboard 2.8L
Page 1: ...2 8L and 4 2L Diesel Inboard Models OPERATION MAINTENANCE MANUAL ...
Page 2: ......
Page 8: ...Page iv 90 8M0133679 eng JUNE 2017 ...
Page 20: ...Section 1 Getting to Know Your Power Package Notes Page 12 90 8M0133679 eng JUNE 2017 ...
Page 38: ...Section 3 Specifications Notes Page 30 90 8M0133679 eng JUNE 2017 ...
Page 92: ......