Short Text Horn Action Long Text Quick Fault Resolution UFC PCM Fault Name
Critical ‑ Engine
Sensor
Critical
Return to port immediately ‑
Service engine before next
use.
Throttle Position sensors do not
agree.
Check ETC
311 6 Dual_TPS_Faults
331 6 ETC_TPSDisagree
Critical ‑ Fuel Pump Critical
Return to port immediately ‑
Service engine before next
use.
Fuel pump is not working properly.
Check fuel pump wire
connections, check for
fuel inlet restriction
3061 16 FULP_OutputFault
Critical ‑ High Voltage Critical
Return to port immediately ‑
Service engine before next
use.
Battery voltage is above normal limit. Check alternator 621 4 SysVolt_RangeHigh
Critical ‑ Low Voltage Critical
Return to port immediately ‑
Turn off unnecessary loads
and check battery connections‑
Service engine before next
use.
Battery voltage is below normal limit.
Check battery cable
connections, inspect
alternator or alternator
fusible link
621 5 SysVolt_RangeLow
4602 23 SysVolt_FaultBlocker
Critical ‑ Oil Pressure Critical
Stop engine and check oil
level. If condition persists
return to port immediately.
Service engine before next
use.
Engine oil pressure is low.
Check oil level, check oil
pressure with a
mechanical gauge,
check oil pressure
sensor
431 21 OilPress_Low
Critical ‑ Overtemp Critical
Stop engine and check for
plugged water inlet. If condition
persists return to port
immediately. Service engine
before next use.
Engine is overheating.
Check water inlets,
check water pump,
check thermostat,
backflush system
521 20 StbdECT_Overtemp
Engine exhaust manifold is
overheating.
Check exhaust sprayers 2124 20 EGT_Overtemp
Critical ‑ Security None
Do NOT key off engine. Return
to port immediately ‑ Service
engine before next use.
Security device is not available. Check wire connections 4501 23 Security_Device_Missing
Critical ‑ Shift Actuator Critical
Return to port immediately ‑
Service engine before next
use.
Shift actuator is not working properly.
Check wire connections
and check ESA with G3
3031 6 ESC_DesiredActualDiff
3032 6 ESCLossOfControl
3037 6 ESC_TimeOut
3049 16 SHFT_OutputFault
Critical ‑ Start System Critical
Return to port immediately ‑
Service engine before next
use.
The starting system is not working
properly. Engine may not start.
Check wire connections,
check start circuit fuse,
check starter
3171 16 STRT_OutputFault
Critical ‑ Throttle
Control
Critical
Return to port immediately ‑
Service engine before next
use.
Electronic throttle controller is not
working properly.
Check wire connections,
check ETC for anything
restricting throttle blade
3012 6 ETC_Loss_Of_Control
3013 6 ETC_OutputFault
3014 6 ETC_Sticking
General Troubleshooting
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 3A-5
To Next Page
Loading...
Need help?
General
