Yanmar 4BY2 - Page 72

Code Part or System Mode Run Or
Condition
Engine
Can
Start
Check
Engine
Alarm
P0122 Throttle Signal Both throttle signals are miss-
ing / short circuit to Ground
1600 yes alarm
Throttle Signal Throttle signal 1 is missing /
short circuit to Ground
reduce yes alarm
P0123 Throttle Signal Both throttle signals are short
circuited to B+
1600 yes alarm
Throttle Signal Throttle signal 1 short circuit to
B+
reduce yes alarm
P0182 Fuel Temperature
Sensor
Short circuit to B+ reduce yes alarm
P0183 Fuel Temperature
Sensor
No connection / short circuit to
Ground
reduce yes alarm
P0192 Fuel Rail Pressure
Sensor
Short circuit to Ground reduce yes alarm
P0193 Fuel Rail Pressure
Sensor
No connection / short circuit
B+
reduce yes alarm
P0201 Injector No. 1 Open circuit / short circuit to
Ground
reduce yes alarm
P0202 Injector No. 2 Open circuit / short circuit to
Ground
reduce yes alarm
P0203 Injector No. 3 Open circuit / short circuit to
Ground
reduce yes alarm
P0204 Injector No. 4 Open circuit / short circuit to
Ground
reduce yes alarm
P0205 Injector No. 5 Open circuit / short circuit to
Ground
reduce yes alarm
P0206 Injector No. 6 Open circuit / short circuit to
Ground
reduce yes alarm
P0222 Throttle Signal Both throttle signals are miss-
ing / short circuit to Ground
1600 yes alarm
Throttle Signal Throttle signal 2 is missing /
short circuit to Ground
reduce yes alarm
P0223 Throttle Signal Both throttle signals are short
circuited to B+
1600 yes alarm
Throttle Signal Throttle signal 2 short circuited
to B+
reduce yes alarm
P0230 Fuel Feed Pump Not connected no no alarm
P0231 Fuel Feed Pump Short circuit to Ground reduce yes alarm
P0232 Fuel Feed Pump Short circuit to B+ no no alarm
P0236 Boost Pressure Plausibility check with APS
(ambient air pressure sensor)
fail
reduce yes alarm
P0237 Boost Pressure Under 0.5 bar (7.3 psi) (abso-
lute
**
)
reduce yes alarm
Boost Pressure Sen-
sor
No connection / short circuit to
Ground
reduce yes alarm
TROUBLESHOOTING
66 BY Series Operation Manual
© 2008 Yanmar Marine International