Mercury MerCruiser MCM 454 Mag MPI Service Manual page 563

FUEL INJECTION SYSTEM TROUBLESHOOTING
Diagnostic Trouble Codes for the MEFI 3 454 cid (7.4L) / 502 cid (8.2L) Engines
(continued)
Code
Number
45
51
61
62
Index
Page 5D-4
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Connection
Ignore first 20 spark events requires
Coil driver fault
8 faults to set code
Checksum error Reserved - Invalid ECM checksum
Minimum run time (10 sec)
Fuel pressure
high
Sensor output high (> 4.9 volts)
Minimum run time (10 sec)
Fuel pressure
low
Sensor output low (< 0.1 volts)
SERVICE MANUAL NUMBER 23
Conditions
90-861326--1 MARCH 1999
Comments
Open secondary
wire
Open primary cable
Bad ECM
Open circuit
Faulty sensor
Bad/wrong regulator
Short circuit
Faulty sensor
No fuel pump power