Yanmar 4BY2 - Diagnostic Trouble Code Table

Diagnostic Trouble Code Table
Code Part or System Mode Run Or
Condition
Engine
Can
Start
Check
Engine
Alarm
No
Code
Coolant Temp Under 0°C (32°F) 1000 rpm yes no
No
Code
Coolant Temp Over 108°C (226°F) reduce yes no
No
Code
Coolant Temp Over 110°C (230°F) reduce yes alarm
No
Code
Charge Air Temp Over 110°C (230°F) reduce yes no
No
Code
Boost Pressure
Reading
4BY2 - over 1.9 bar (27.5 psi)
(relative*) or 2.9 bar (42.0 psi)
(absolute**)
6BY2 - over 2.3 bar (33.3 psi)
(relative*) or 3.3 bar (42.9 psi)
(absolute
**
)
reduce yes alarm
No
Code
Fuel Temperature Over 90°C (194°F) reduce yes no
No
Code
Neutral Switch Only in case of analog throttle
or in case of CAN-fault
(U0001), wrong configuration -
neutral position
no no alarm
P0001 Fuel Metering Unit Not connected reduce yes alarm
P0003 Fuel Metering Unit Short circuit to Ground no no alarm
P0004 Fuel Metering Unit Short circuit to B+ reduce yes alarm
P0087 Rail Pressure Gover-
nor Deviation
Fuel rail pressure out of range reduce or
shut off
depends
on fault
alarm
P0088 Rail Pressure Gover-
nor Deviation
Fuel rail pressure out of range reduce or
shut off
depends
on fault
alarm
P0089 Rail Pressure Gover-
nor Deviation
Fuel rail pressure out of range yes yes alarm
P0090 Fuel Pressure Control
Valve
Not connected no no alarm
Rail Pressure Gover-
nor Deviation
Fuel rail pressure out of range reduce yes alarm
P0091 Fuel Pressure Control
Valve
Short circuit to Ground reduce yes alarm
P0092 Fuel Pressure Control
Valve
Short circuit to B+ no no alarm
P0112 Charge Air Temp Over 125°C (257°F) reduce yes alarm
Charge Air Temp
Sensor
Short circuit to B+ reduce yes alarm
P0113 Charge Air Temp Under -20°C (-4°F) reduce yes alarm
Charge Air Temp
Sensor
No connection / short circuit to
Ground
reduce yes alarm
P0117 Coolant Temp Sensor Short circuit to B+ reduce yes alarm
P0118 Coolant Temp Sensor No connection / short circuit to
Ground
reduce yes alarm
TROUBLESHOOTING
BY Series Operation Manual 65
© 2008 Yanmar Marine International