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Section 7 - Troubleshooting
Diagnosing EFI Problems
Your authorized Mercury MerCruiser dealer has the proper service tools for diagnosing problems on Electronic Fuel Injection (EFI)
Systems. The Electronic 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.
Diagnosing DTS Problems
Your authorized Mercury MerCruiser dealer has the proper service tools for diagnosing problems on Digital Throttle and Shift
(DTS) Systems. The Electronic 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/PCM's memory. This code can then be
read later by a service technician using a special diagnostic tool.
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.
Starter Motor Will Not Crank Engine, Or Cranks Slow
Possible Cause
Battery switch turned off.
Remote control not in neutral position.
Open circuit breaker or blown 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. Replace kinked lines or blow out lines with compressed air to remove obstruction.
Faulty wire connections.
EFI system fault.
Page 110
Turn the switch on.
Position the control lever in neutral.
Check and reset the circuit breaker or replace fuse.
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.
Check wire connections.
Have EFI System checked by an authorized Mercury MerCruiser dealer.
Remedy
Remedy
90-8M0053269
NOVEMBER 2010
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