Special Tools - Mercury MerCruiser MCM 454 Mag MPI Service Manual

FUEL DELIVERY SYSTEM FOR ELECTRONIC FUEL INJECTION

Special Tools

Minimum 10 megohm input impedance
required on all voltage ranges. As
ammeter, 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
impulses 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
injection system. injection system
Allows multi-meter connections with wiring
harness.
Used to perform fuel system pressure
tests.
Used with the fuel shut off tool to adapt to
the fuel rail inlet line on the 7.4L MPI
model. (These fittings are included in Fuel
Shut Off Tool 91-805918A2)
Used to set Ignition timing. Plug connects
to DLC
Allows connection of Fuel Pressure
Gauge
Index
Page 5A-6
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Description
SERVICE MANUAL NUMBER 23
Tool Name
High Impedance
J-34029-A
Multimeter (DVM)
Vacuum Pump with
J-23738
Gauge - 20 In. Hg
Minimum
Unpowered Test
J-34142-B
Light
Timing Light 91-99379
Fuel Pressure
91-16850A1
Gauge
Injector Harness
J-34730-2A
Test Light
Quicksilver Scan
91-823686A2
Tool
MERCRUISER
84-822560A2
Cable
MERCRUISER
91-861538
Cartridge
Harness Test
J-35616
Adapter
Fuel Shut Off Tool 91-805918A2
Fuel Shut Off Tool
91-802662A1
Adapter Fittings
Timing Tool Jumper
91-805747A1
Plug
Fuel Line Connec-
91-806901
tor
90-861326--1 MARCH 1999
Part Number
1
2