Yamaha F150A - Page 120

4-9
Outboard motor troubleshooting
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A
*1. When displayed on the YDIS screen, “*****” or “Immobilizer” represents Y-COP.
37
Intake air passage
(Air leakage)
“Check Engine” is displayed.
Engine operates normally
except at idle.
Check the O-rings and gaskets of the
intake manifold.
6-34
Check the intake manifold for cracks. 6-38
Check the vacuum hose. 6-4
Check the opening condition of TPS
and the ISC valve using the YDIS.
5-15
5-15
39
Oil pressure sensor
(Out of specification)
“Check Engine” is displayed.
Higher idle speed
Check the oil pressure using the
YDIS.
7-1
Measure the oil pressure sensor input
voltage.
5-16
Measure the oil pressure sensor out-
put voltage.
5-16
Check for wiring continuity between
the oil pressure sensor and the
engine ECM.
A-2
45
Shift cut-off switch
(Irregular signal)
“Check Engine” is displayed.
Higher idle speed
Measure the shift cut-off switch input
voltage.
5-26
Measure the shift cut-off switch resis-
tance.
5-26
Check for wiring continuity between
the shift cut-off switch and the engine
ECM.
A-4
46
Thermoswitch
(Irregular signal)
“Check Engine” is displayed.
Higher idle speed
Measure the thermoswitch input volt-
age.
5-25
Check the thermoswitch for continu-
ity.
5-25
Check for wiring continuity between
the thermoswitch and the engine
ECM.
A-4
86
Immobilizer *1
(Communication
error)
“Check Engine” is displayed.
Declining maximum engine
speed
Check that Y-COP is properly con-
nected.
3-29
Measure the Y-COP input voltage. 5-30
Check the Y-COP circuit. 5-30
Tro uble
code
Item
(Condition)
Symptom Checking steps
See
page