Special Tools - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23
MEFI 3 - Codes for the 454 cid (7.4L) / 502 cid (8.2L) Engines (continued)
Number

Special Tools

J-34029-A (Note 1)
J-23738
J-34142-B (Note 2)
91-99379
91-16850A1
J-34730-2A
91-823686A2
84-822560A2
91-861538
94040M
Index
90-861326--1 MARCH 1999
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Code
Connection
45 Coil driver fault
51 Checksum error Reserved - Invalid ECM checksum
Fuel pressure
61
high
Fuel pressure
62
low
Part Number
High Impedance
Multimeter (DVM)
Vacuum Pump with
Gauge - 20 In. Hg
Minimum
Unpowered Test
Light
Timing Light
Fuel Pressure
Gauge
Injector Harness
Test Light
Quicksilver Scan
Tool
MERCRUISER
Cable
MERCRUISER Car-
tridge
EFI Scan Tool/Injec-
tor Tester
(Rinda Technolo-
gies)
Conditions
Ignore first 20 spark events requires
8 faults to set code
Minimum run time (10 sec)
Sensor output high (> 4.9 volts)
Minimum run time (10 sec)
Sensor output low (< 0.1 volts)
Tool Name
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,
2/20/200 kΩ, 2/20 mΩ
Gauge monitors manifold engine vacuum.
Hand pump used to check fuel pressure
regulator
Used to check circuit wiring, short to
ground, or voltage.
Used to check ignition timing. Must have
inductive signal pickup.
Used to check fuel system pressure.
Visually indicates injector electrical im-
pulses from the ECM.
Dis lays roblem codes stored in the Displays problem codes stored in the
ECM. It also allows monitoring of various
circuits and components in the fuel injec-
tion system. tion system
Displays problem codes stored in the
ECM. It also allows monitoring of various
circuits and components in the fuel injec-
tion system. Allows for test firing injectors.
GENERAL SYSTEM DIAGNOSTICS
Comments
Open secondary
wire
Open primary cable
Bad ECM
Open circuit
Faulty sensor
Bad/wrong regulator
Short circuit
Faulty sensor
No fuel pump power
Description
Page 5E-7