Fail-Safe Function Table - Yamaha WaveRunner FX140 Service Manual

FAIL-SAFE FUNCTION TABLE

Symptom
Incorrect pulser coil
signal
Incorrect cam position
sensor signal
Incorrect engine tem-
perature sensor signal
Incorrect throttle posi-
tion sensor signal
Incorrect intake air tem-
perature sensor signal
Incorrect intake air
pressure sensor signal
Incorrect slant detec-
tion switch signal
Battery voltageis below
specified voltage
Ignition control
• Only the cylinders
inputting signals
ignite initially in
the starting mode
• Normal control in
normal mode
Normal control
Normal control with
false engine temper-
ature
Fix ignition timing in
normal mode
Normal control with
false intake air tem-
perature
Normal control
Normal control
Normal control
Fuel injection control
All cylinders inject simultaneously
based on cylinder receiving normal
signal
• An incorrect signal after cylinder
distinction continues with cylinder
distinction before fault occurred,
and an incorrect signal before nor-
mal control cylinder distinction,
conducts group injection.
• However, if a signal is received
during group injection from the
cam position sensor, normal con-
trol is activated after cylinder dis-
tinction.
Normal control with false engine
temperature
Add fuel correction coefficient based
on basic fuel injection volume
Normal control with false intake air
temperature
Add fuel correction coefficient based
on basic fuel injection volume
Normal control
Normal control
26
Backup
Substitute with
remaining sensors
None
False engine tem-
perature is 50 °C
(122 °F)
Cancel throttle posi-
tion sensor control
False intake air tem-
perature is 45 °C
(113 °F)
Cancel intake air
pressure control
Do not renew atmo-
spheric pressure
Cancel slant detec-
tion switch control
None