Yanmar 4BY2 Operation Manuals

Also see for 4BY2: Service manual

Contents

Code Part or System Mode Run OrConditionEngineCanStartCheckEngineAlarmP0122 Throttle Signal Both throttle signals are miss-ing / short circuit to Ground1600 yes alarmThrottle Signal Throttle signal 1 is missing /short circuit to Groundreduce yes alarmP0123 Throttle Signal Both throttle signals are shortcircuited to B+1600 yes alarmThrottle Signal Throttle signal 1 short circuit toB+reduce yes alarmP0182 Fuel TemperatureSensorShort circuit to B+ reduce yes alarmP0183 Fuel TemperatureSensorNo connection / short circuit toGroundreduce yes alarmP0192 Fuel Rail PressureSensorShort circuit to Ground reduce yes alarmP0193 Fuel Rail PressureSensorNo connection / short circuitB+reduce yes alarmP0201 Injector No. 1 Open circuit / short circuit toGroundreduce yes alarmP0202 Injector No. 2 Open circuit / short circuit toGroundreduce yes alarmP0203 Injector No. 3 Open circuit / short circuit toGroundreduce yes alarmP0204 Injector No. 4 Open circuit / short circuit toGroundreduce yes alarmP0205 Injector No. 5 Open circuit / short circuit toGroundreduce yes alarmP0206 Injector No. 6 Open circuit / short circuit toGroundreduce yes alarmP0222 Throttle Signal Both throttle signals are miss-ing / short circuit to Ground1600 yes alarmThrottle Signal Throttle signal 2 is missing /short circuit to Groundreduce yes alarmP0223 Throttle Signal Both throttle signals are shortcircuited to B+1600 yes alarmThrottle Signal Throttle signal 2 short circuitedto B+reduce yes alarmP0230 Fuel Feed Pump Not connected no no alarmP0231 Fuel Feed Pump Short circuit to Ground reduce yes alarmP0232 Fuel Feed Pump Short circuit to B+ no no alarmP0236 Boost Pressure Plausibility check with APS(ambient air pressure sensor)failreduce yes alarmP0237 Boost Pressure Under 0.5 bar (7.3 psi) (abso-lute**)reduce yes alarmBoost Pressure Sen-sorNo connection / short circuit toGroundreduce yes alarmTROUBLESHOOTING66 BY Series Operation Manual© 2008 Yanmar Marine International