Fail-Safe Control - Yamaha F225F Service Manual

Fail-safe control

In fail-safe control, the engine ECM enters the fail-safe mode when an electrical component mal-
functions. The fail-safe control system records the trouble codes according to the engine trouble
conditions.
Trouble
Item
code
13 Pulser coil
15 Engine
temperature
sensor
17 Knock sensor
23 Air temperature
sensor
24 Cam position
sensor (PORT
EX)
29 Air pressure
sensor
39 Oil pressure
sensor
71 Cam position
sensor (PORT
EX)
72 Cam position
sensor (PORT
IN)
73 OCV (STBD)
74 OCV (PORT)
86 Y-COP
112, 113, ETV
114, 115,
116, 117,
118, 119,
121, 122,
123, 129,
136, 137,
138, 139,
141, 142,
144, 145
124, 125, TPS
126, 127,
128
LAN
gauge Trouble conditions to be detected
display
C/E No signal
Open or short circuit in the engine temperature sensor
C/E circuit. Output voltage is less than 0.18 V or more than
4.90 V.
C/E Output voltage is less than 0.90 V or more than 4.00 V.
Output voltage is less than 0.10 V or more than 4.60 V.
C/E
Signal error (irregular)
C/E
Output voltage is less than 0.20 V or more than 4.50 V.
C/E
Output voltage is less than 0.30 V, more than 4.80 V for
L (*1) 260 seconds, or more than 4.80 V when the engine is
stopped.
Signal error (irregular)
C/E
Signal error (irregular)
C/E
C/E Open or short circuit in the OCV circuit
C/E Open or short circuit in the OCV circuit
Open or short circuit in the Y-COP circuit
C/E Communication error continues for more than 3
seconds.
Open or short circuit in the ETV relay and ETV motor
circuit
C/E
Output voltage is less than 0.35 V or more than 4.80 V,
C/E or the output voltage difference between TPS 1 and
TPS 2 is 2.30 V or more.
Electronic control system
2-16
0
1
2
3
4
5
6
7
8
9
10
A