Short Text Horn Action Long Text Quick Fault Resolution UFC PCM Fault Name
Engine Sensor Caution Service engine soon.
Water pressure sensor is not working
properly.
Check wiring
421 24 SeaPumpPress_RangeHigh
421 25 SeaPumpPress_RangeLow
Engine Sensor None
Check oil level before
continuing engine operation.
Oil level could not be determined. Check wiring 711 19 OilLevelInvalid
Engine Sensor None Service engine soon.
Exhaust oxygen sensor is not
working properly.
Check wiring
821 1 UEGO1_Sensor_Open
821 27 UEGO1_Sensor_Short
822 5 UEGO1_HtrLwrLimit
822 16 UEGO1_HtrOpnShrt
822 4 UEGO1_HtrUprLimit
Engine Sensor None Service engine soon.
Manifold absolute pressure sensor is
not working properly.
Check wiring
402 24 MAP_Angle_RangeHigh
402 25 MAP_Angle_RangeLow
407 17 BaroRange
Fuel Injector Caution Service engine soon. Fuel injector is not working properly. Check wiring
201 16 INJ1_OutputFault
202 16 INJ2_OutputFault
203 16 INJ3_OutputFault
204 16 INJ4_OutputFault
205 16 INJ5_OutputFault
206 16 INJ6_OutputFault
207 16 INJ7_OutputFault
208 16 INJ8_OutputFault
Fuel System None Service engine soon. Fuel system is not working properly.
Check wiring, check for
fuel restriction
902 4 O2Control_ITermHighPort
902 5 O2Control_ITermLowPort
Ignition Caution Service engine soon. Ignition coil is not working properly. Check wiring
101 16 EST1_OutputFault
102 16 EST2_OutputFault
103 16 EST3_OutputFault
104 16 EST4_OutputFault
Oil Level Critical
Check oil level before
continuing engine operation.
Engine oil level is low. Fill sump 713 21 OilLevel_Critically_Low
Reverse Gear
Unavailable
Critical
Return to port immediately ‑
Service engine before next
use.
Reverse gear is not available.
Moving control lever into reverse will
result in a forward gear shift. Engine
power is limited.
Check shift demand
sensor, check ESC
wiring
3039 23 Loss_of_Shift_Command
Security None
Insert correct key fob. Failed to pass security check. Check wiring 4502 23 Security_Locked
Insert other key fob, wait 10
sec, then key off all engines.
Security device is in setup mode. Check wiring 4503 23 Security_Setup
Shift Actuator Caution Service engine soon. Shift actuator is not working properly.
Check wiring, check with
G3
3033 6 ESC_NoAdapt_Reverse
3034 6 ESC_NoAdapt_Forward
General Troubleshooting
Page 3A-8 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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