Yamaha F30B 2018, Service Manual

Page: 69 / 348

4-6
Outboard motor troubleshooting
28
Shift position
switch (Irregu-
lar signal)
“Check Engine” is displayed.
Engine operates normally.
Check the gear shift operation. 10-4
Measure the shift position
switch input voltage.
5-32
Check the shift position switch
for continuity.
5-32
Check for wiring continuity be-
tween the shift position switch
and the engine ECM.
A-15
29
Air pressure
sensor (Out of
specification)
“Check Engine” is displayed.
High engine idle speed
Declining maximum engine
speed
Measure the intake air pres-
sure sensor input voltage.
5-31
Check for wiring continuity be-
tween the throttle body and the
engine ECM.
A-15
37
Intake air pas-
sage (Air leak)
“Check Engine” is displayed.
Engine operates normally, ex-
cept at idle.
Check the gaskets of the in-
take manifold and the throttle
body.
6-12
Check the intake manifold for
cracks.
6-13
Check the opening condition of
TPS and the ISC valve using
the YDIS.
5-19
49
Over cooling
(Irregular sig-
nal)
Engine operates normally.
Check that the trouble code 15
has not appeared.
4-5
Check the thermostat. 7-46
86
Immobilizer
(Communica-
tion error)
Engine operates normally.
Check that Y-COP is connect-
ed properly.
—
Measure the remote control re-
ceiver input voltage.
—
Check the Y-COP circuit. —
Trou-
ble
code
Item (Condition) Symptom Checking steps
See
page