Fail-Safe Control - Yamaha F200B 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
Engine
15 temperature
sensor
17 Knock sensor
Air temperature
23
sensor
24, 71, Cam position
72 sensor
28 Neutral switch
Air pressure
29
sensor
Oil pressure
39 sensor
Shift cut switch
45
Thermoswitch
46
73, 74 OCV
112, 113, ETV
114, 115,
116, 117,
118, 119,
121, 122,
123, 129,
136, 137,
138, 139,
141, 142,
143, 144,
145
TPS
124, 125,
126, 127,
128
131, 132, APS
133, 134,
135
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
C/E Neutral switch is off during the start-up mode.
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
C/E for 260 seconds, or more than 4.80 V when the engine
is stopped.
Output voltage is more than 4.50 V, the shift cut switch
C/E is on during the start-up mode, or both the neutral
switch and shift cut switch are on for 5 seconds.
Switch is on when the engine temperature is 40 °C
C/E (104 °F) or less, or off when the engine temperature is
more than 120 °C (248 °F).
C/E Open or short circuit in the OCV circuit.
Open or short circuit in the ETV relay and ETV motor
circuit.
C/E
TPS 1 output voltage is less than 0.35 V or more than
4.80 V, TPS 2 output voltage is less than 2.25 V or
C/E
more than 4.80 V, or the output voltage difference
between TPS 1 and TPS 2 is 2.30 V or more.
Open or short circuit in the APS circuit, or the output
C/E voltage difference between APS 1 and APS 2 is 0.996
V or more.
Electronic control system
2-10
2