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