Service manual

90-898303

4-32

Component Description and Diagnostics

The Propulsion Control Module (PCM) is dependable and should not be

replaced before testing the suspected sensor or wiring harness. The corrosive

environment of marine applications combined with vibration suggests that

most problems occur with either the wiring or the sensor. If the engine is

running poorly or not starting and there are no specific fault codes, some

preliminary investigation is needed before replacing a sensor or the PCM.

Conditions resulting in poor drive-ability or ignition can be attributed to:

• Fouled spark plugs

• Faulty plug wires

• A weak ignition coil

• Vacuum leaks

• Low compression

• Dirty injectors

• Low fuel pressure

• Low air pressure

• Low charging voltage

Fuses

The electrical wiring circuits on the outboard are protected from overload by

fuses in the wiring. If a fuse is blown, try to locate and correct the cause of the

overload. If the cause is not found, the fuse may blow again.

1) Open the fuse holder and look at the silver colored band inside the fuse. If

band is broken, replace the fuse. Replace fuse with a new fuse with the

same rating.

2) The fuses and circuits are identified as follows:

a) Smart Craft Data Bus Circuit – SFE 15 Ampere Fuse

b) Fuel Injector Harness, Electric Fuel Pump and Oil Pump

c) Main Power Relay, Remote Control Harness and Power Trim

d) Ignition Coils

Notes

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