MerCruiser 6.2 MPI User Manual

Section 7 - Troubleshooting
Page 94 90-864197072 NOVEMBER 2007
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 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 blown fuse. Check and reset the 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 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.

MerCruiser 6.2 MPI Specifications

General

Engine Type	V8
Alternator Output	65 amp / 917 watt
Compression Ratio	9.4:1
Displacement	6.2L (377 cu in)
Horsepower	300 hp
Fuel System	Multi-Port Fuel Injection (MPI)
Ignition	Distributorless Ignition (DTS)
Fuel Type	87 Octane Compatible
Max RPM	5400 RPM
Bore x Stroke	4.00 x 3.75 in / 101.6 x 95.25 mm