Yamaha F75F - Troubleshooting Procedure (Trouble Code Not Detected)

Outboard motor troubleshooting
4-7
Troubleshooting procedure (trouble code not detected)
Troubleshooting consists of the following 5 items:
Symptom 1: Specific trouble conditions
Symptom 2: Trouble conditions of an area or individual part
Cause: Trouble causes of symptom 2
Checking steps: Method for checking
See page: Reference page
—: Not applicable
56
Main power
su
pply (Irregu-
lar signal)
“Check Engine” is displayed.
Main relay is not turned off
e
ven if the main switch is OFF.
Battery discharges.
Check for wiring short
betw
een the main switch and
the engine ECM.
A-8
A-10
A-12
Check for wiring short
betw
een the fuse box and the
engine ECM.
A-8
A-10
Replace the fuse box. 7-22
57
Starter magnet
po
wer supply
(Irregular sig-
nal)
“Check Engine” is displayed.
Engine does not crank.
Starter motor cannot be
tur
ned on or off.
Check the fuse. 5-5
Check for wiring open or short
betw
een the engine start
switch and the engine ECM.
A-8
A-10
A-12
Check for wiring open or short
betw
een the fuse box and the
engine ECM.
A-8
A-10
Check for wiring open or short
betw
een the fuse box and the
starter motor.
A-8
A-10
Replace the fuse box. 7-22
58
HP fuel pump
PWR
“Check Engine” is displayed.
Engine stalls.
High-pressure fuel pump can-
not be turned on or off.
Check for wiring open or short
betw
een the fuse box and the
engine ECM.
A-8
A-10
Check for wiring open or short
betw
een the fuse box and the
high-pressure fuel pump.
A-8
A-10
Replace the fuse box. 7-22
86
Immobilizer
(Comm
unica-
tion error)
“Check Engine” is displayed.
Declining maximum engine
spee
d
Measure the remote control
receiv
er input voltage.
—
Trouble
code
Item
(Co
ndition)
Symptom Checking steps
See
page