Yamaha F300B - Fail-Safe Control

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