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Section 6 - Troubleshooting
Diagnosing EFI Problems
Your authorized Mercury MerCruiser dealer has the proper service tools for diagnosing problems on electronic fuel injection
(EFI) 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 ECMs memory. 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 engine control module (ECM)/propulsion control module (PCM) on these engines has the ability to detect
some problems with the system when they occur, and store a Trouble Code in the ECM/PCMs memory. This code can then be
read later by a service technician using a special diagnostic tool.
Additional Operation Instructions for Axius Systems
If your boat has DTS engines equipped with an Axius system, refer also to the Axius Operation Manual included with the
boat.
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 continuous beep and/or reducing engine power in order to provide engine protection.
If Guardian System has been activated, reduce throttle speed. The horn will turn off when throttle speed is within the allowable
limit. Consult an authorized Mercury MerCruiser dealer for assistance.
Troubleshooting Charts
Starter Motor Will Not Crank Engine, or Cranks Slowly
Possible Cause
Battery switch turned off.
Remote control not in neutral position.
Open circuit breaker or fuse.
Loose or dirty electrical connections or
damaged wiring.
Bad battery or low battery voltage.
Lanyard stop switch activated.
Engine Will Not Start or Is Hard to Start
Possible Cause
Lanyard stop switch activated.
Improper starting procedure.
Insufficient fuel supply.
Faulty ignition system component.
Clogged fuel filter.
Stale or contaminated fuel.
Fuel line or tank vent line kinked or clogged.
Faulty wire connections.
EFI system fault.
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Turn the switch on.
Position the control lever in neutral.
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.
Check all electrical connections and wires (especially battery cables). Clean
and tighten all faulty connections.
Test the battery and charge if necessary; replace if bad.
Check the lanyard stop switch.
Check the lanyard stop switch.
Read the starting procedure.
Fill fuel tank or open valve.
Service the ignition system.
Replace fuel filter.
Drain fuel tank. Fill with fresh fuel.
Replace kinked lines or blow out lines with compressed air to remove
obstruction.
Check wire connections.
Have EFI system checked by an authorized Mercury MerCruiser dealer.
Remedy
Remedy
90-8M0128976
MAY 2017
eng
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