Mercury V8 250 User Manual

Short Text Horn Action Long Text Quick Fault Resolution UFC PCM Fault Name
Engine Sensor Caution Service engine soon.
Coolant temperature sensor is not working properly.
Check wiring
521 24 StbdECT_RangeHigh 521 25 StbdECT_RangeLow
Engine Sensor Caution Service engine soon.
Engine air temperature sensor is not working properly.
Check wiring
511 24 IAT_RangeHigh 511 25 IAT_RangeLow
Engine Sensor Caution Service engine soon.
Engine camshaft encoder is not
working properly.
Check wiring 1051 23 Camshaft_Encoder_Fault
Engine Sensor Caution Service engine soon.
Engine oil pressure sensor is not working properly.
Check wiring
431 24 OilPress_RangeHigh 431 25 OilPress_RangeLow
Engine Sensor Caution Service engine soon.
Engine oil temperature sensor is not working properly.
Check wiring
531 24 OilTemp_RangeHigh 531 25 OilTemp_RangeLow
Engine Sensor Caution Service engine soon.
Engine shift demand sensor is not working properly.
Check wiring
1063 24 ShiftDmdSensor1_RangeHigh
1063 25 ShiftDmdSensor1_RangeLow
1064 24 ShiftDmdSensor2_RangeHigh
1064 25 ShiftDmdSensor2_RangeLow
Engine Sensor Caution Service engine soon.
Engine throttle demand sensor is not working properly.
Check wiring
1061 24 DemandSensor1_RangeHigh 1061 25 DemandSensor1_RangeLow 1062 24 DemandSensor2_RangeHigh 1062 25 DemandSensor2_RangeLow 1071 6 DmdSense1_NoAdapt
1072 6 DmdSense2_NoAdapt
Engine Sensor Caution Service engine soon.
Exhaust gas temperature sensor is not working properly.
Check wiring
572 24 EGT_RangeHigh 572 25 EGT_RangeLow
Engine Sensor Caution Service engine soon.
Manifold absolute pressure sensor and throttle position sensor do not agree.
Check wiring
404 6 MAPR_TPS1Rationality
405 6 MAPR_TPS2Rationality
Engine Sensor Caution Service engine soon.
Manifold absolute pressure sensor is not working properly.
Check wiring
401 24 MAP_Time_RangeHigh 401 25 MAP_Time_RangeLow
Engine Sensor Caution Service engine soon.
Throttle position sensor is not working properly.
Check wiring
301 24 TPS1_RangeHigh 301 25 TPS1_RangeLow
302 24 TPS2_RangeHigh
302 25 TPS2_RangeLow 341 6 TPS1_ETC_NoAdapt 342 6 TPS2_ETC_NoAdapt
Engine Sensor Caution Service engine soon.
Trim position is not working properly. Trim limiting may not be enforced. Boat damage could occur.
Check wiring
1012 24 TrimPos_RangeHigh
1012 25 TrimPos_RangeLow
General Troubleshooting
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 3A-7

Mercury V8 250 Specifications

General

Engine Type	V8
Horsepower	250 HP
Displacement	4.6L
Fuel Induction System	Electronic Fuel Injection (EFI)
Steering	Hydraulic Steering
Gear Ratio	1.75:1
Cylinders	8
Starting	Electric Start
Full Throttle RPM Range	5200-6000 RPM
Alternator Amp	85 amp
Shaft Length	25 in
Weight	527 lbs
Fuel Type	Unleaded 87 octane minimum