SERVICE MANUAL NUMBER 23
GENERAL SYSTEM DIAGNOSTICS
MEFI 3 - Codes for the 454 cid (7.4L) / 502 cid (8.2L) Engines (continued)
Code
Number
Connection
Conditions
Comments
Open secondary
wire
Ignore first 20 spark events requires
45
Coil driver fault
8
faults to set code
Open primary cable
Bad ECM
51
Checksum error Reserved - Invalid ECM checksum
Open circuit
Minimum run time (10 sec)
Fuel pressure
high
61
62
Faulty sensor
Sensor output high (> 4.9 volts)
Bad/wrong regulator
Short circuit
Minimum run time (10 sec)
Fuel pressure
low
Faulty sensor
Sensor output low (< 0.1 volts)
No fuel pump power
Special Tools
Part Number
Tool Name
Description
Minimum 10 megohm input impedance
required on all voltage ranges. As amme-
ter, accurately measures low value current
flow. As ohmmeter, reads 0-200 ohms,
High Impedance
Multimeter (DVM)
J-34029-A (Note 1)
J-23738
2/20/200
kΩ, 2/20 mΩ
Vacuum Pump with Gauge monitors manifold engine vacuum.
Hand pump used to check fuel pressure
regulator
Gauge - 20 In. Hg
Minimum
Unpowered Test
Light
Used to check circuit wiring, short to
ground, or voltage.
J-34142-B (Note 2)
91-99379
Used to check ignition timing. Must have
inductive signal pickup.
Timing Light
Fuel Pressure
Gauge
91-16850A1
J-34730-2A
Used to check fuel system pressure.
Injector Harness
Test Light
Visually indicates injector electrical im-
pulses from the ECM.
Quicksilver Scan
Tool
91-823686A2
84-822560A2
91-861538
Displays problem codes stored in the
ECM. It also allows monitoring of various
circuits and components in the fuel injec-
tion system.
MERCRUISER
Cable
MERCRUISER Car-
tridge
EFI Scan Tool/Injec- Displays problem codes stored in the
tor Tester
(Rinda Technolo-
gies)
ECM. It also allows monitoring of various
circuits and components in the fuel injec-
tion system. Allows for test firing injectors.
94040M
Index
90-861326--1
MARCH 1999
Page 5E-7
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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