Yamaha F150A Service Manual page 120

Trouble Item
code (Condition)
Intake air passage
37
(Air leakage)
Oil pressure sensor
39
(Out of specification)
Shift cut-off switch
45
(Irregular signal)
Thermoswitch
46
(Irregular signal)
Immobilizer *1
86 (Communication
error)
*1. When displayed on the YDIS screen, "*****" or "Immobilizer" represents Y-COP.
Symptom
"Check Engine" is displayed.
Engine operates normally
except at idle.
"Check Engine" is displayed.
Higher idle speed
"Check Engine" is displayed.
Higher idle speed
"Check Engine" is displayed.
Higher idle speed
"Check Engine" is displayed.
Declining maximum engine
speed
4-9
Outboard motor troubleshooting
Checking steps
Check the O-rings and gaskets of the
intake manifold.
Check the intake manifold for cracks.
Check the vacuum hose.
Check the opening condition of TPS
and the ISC valve using the YDIS.
Check the oil pressure using the
YDIS.
Measure the oil pressure sensor input
voltage.
Measure the oil pressure sensor out-
put voltage.
Check for wiring continuity between
the oil pressure sensor and the
engine ECM.
Measure the shift cut-off switch input
voltage.
Measure the shift cut-off switch resis-
tance.
Check for wiring continuity between
the shift cut-off switch and the engine
ECM.
Measure the thermoswitch input volt-
age.
Check the thermoswitch for continu-
ity.
Check for wiring continuity between
the thermoswitch and the engine
ECM.
Check that Y-COP is properly con-
nected.
Measure the Y-COP input voltage.
Check the Y-COP circuit.
See
page
6-34
0
6-38
6-4
5-15
5-15
1
7-1
5-16
2
5-16
A-2
3
5-26
4
5-26
A-4
5
5-25
5-25
6
A-4
7
3-29
5-30
5-30
8
9
10
A