EFI System/Ignition Relay Check
(1 of 2)
TO IN-LINE BOAT HARNESS
50A
CIRCUIT
BREAKER
86
30
85
90
AMP
FUSE
87
15A
INJ/ECM/KS
MODULE FUSE
10A
CIRCUIT DESCRIPTION:
2. This step ensures that battery and ignition volt-
age are available at the relay. An open or shorted
condition in either supply would cause the relay
not to operate.
Battery voltage is constantly supplied to terminal 30
of the system relay. When the ignition switch is
moved to the run position, battery voltage is supplied
to terminal 86 of the system relay. The pull-in coil is
then energized, creating a magnetic field which
closes the contacts of the system relay. Voltage and
current are then supplied to the ignition coil, injectors,
ECM and fuel pump relay fuse through terminal 87 of
the system relay.
3. This step ensures that a good ground exists to
terminal 85 of the system relay. An open ground
to this terminal would not allow current to flow
through the pull-in coil.
4.
At this point, the circuits leading to the relay have
been checked, and a careful visual inspection of
the relay terminals should be preformed prior to
replacement of the system relay.
TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the
diagnostic chart.
1.
This step identifies if the relay is functioning prop-
erly. If a fault in the relay circuit were present, volt-
age would not be available at terminal B of the
ignition coil.
Index
5C-72 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
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Manuals are all Important for Technician
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