Diagnosing EFI Problems
Your authorized Mercury MerCruiser dealer has the proper service tools for diagnosing problems on electronic fuel injection
(EFI) systems. The propulsion control module (PCM) has the ability to detect problems with the system when they occur, and
store a trouble code. This code can then be read later by a service technician using a special diagnostic tool.
Diagnosing DTS Problems
Your authorized Mercury MerCruiser dealer has the proper service tools for diagnosing problems on digital throttle and shift
(DTS) systems. The propulsion control module (PCM) has the ability to detect problems with the system when they occur, and
store a trouble code. This code can then be read later by a service technician using a special diagnostic tool.
Additional Operation Instructions for Joystick Piloting Sterndrive (JPS)
Refer to the JPS Operation Manual for additional important operation and maintenance instructions if your boat is equipped
with JPS.
Engine Guardian System
The Engine Guardian System monitors the critical sensors on the engine for any early indications of problems. The system will
respond to a problem by emitting a caution or critical warning horn strategy. Reduce engine power to provide engine protection.
If a critical guardian state has been activated, the warning horn will be active for six seconds and then turn off. Warning text
enabled SmartCraft gauges will display a message indicating the reason of the critical Guardian warning. It may be necessary
to consult an authorized Mercury dealer for assistance.
Troubleshooting Charts
Starter Motor Will Not Crank Engine, or Cranks Slowly
Possible Cause
Remedy
Battery switch turned off. Turn the switch on.
Remote control not in neutral position. Position the control lever in neutral.
Open circuit breaker or fuse.
Check and reset the main power circuit breaker or replace the fuse. Check the
5‑amp fuse on the power harness connected to the battery, and replace if
necessary.
Loose or dirty electrical connections or
damaged wiring.
Check all electrical connections and wires (especially battery cables). Clean
and tighten all faulty connections.
Bad battery or low battery voltage. Test the battery and charge if necessary; replace if bad.
Lanyard stop switch activated. Check the lanyard stop switch.
Engine Will Not Start or Is Hard to Start
Possible Cause
Remedy
Lanyard stop switch activated. Check the lanyard stop switch.
Improper starting procedure. Read the starting procedure.
Insufficient fuel supply. Fill fuel tank or open valve.
Faulty ignition system component. Service the ignition system.
Clogged fuel filter. Replace fuel filter.
Stale or contaminated fuel. Drain fuel tank. Fill with fresh fuel.
Fuel line or tank vent line kinked or clogged.
Replace kinked lines or blow out lines with compressed air to remove
obstruction.
Faulty wire connections. Check wire connections.
EFI system fault. Have EFI system checked by an authorized Mercury MerCruiser dealer.
Section 6 - Troubleshooting
Page 100 90-8M0128973 eng MAY 2017
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