Mercury 225 EFI, Service Manual

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POWER TRIM - DESIGN II
90-884294 OCTOBER 2001 Page 5B-27
Troubleshooting the “Down” and “Up” Circuits
(All Circuits Inoperative)
Battery Voltage Indicated:
No Voltage Indicated:
Battery Voltage Indicated:
Battery Voltage Indicated:
Battery Voltage Indicated:
No Voltage Indicated:
No Voltage Indicated:
No Voltage Indicated:
Blown Fuse:
Fuse Not Blown:
Check in-line fuse (under cowl)
to see if fuse is blown.
•
Correct problem that caused
fuse to blow.
•
Replace fuse.
•
Check battery leads for poor
connections or open circuits.
•
Check battery charge.
•
Connect Voltmeter red lead to
Point 8 and black lead to
ground.
•
Depress “Up” trim button and
check for battery voltage.
•
Check black ground wires for
poor connection or poor
ground, Point 10.
•
Pump motor is faulty. Refer to
“Motor and Electrical Tests/
Repair”, following.
•
Check for open in wire.
•
Check for loose or corroded
connections.
•
Check for voltage at any instru-
ment, using a Voltmeter.
•
Turn ignition switch to “Run”
position.
•
DO NOT start engine.
•
Check for pinched or severed
wires.
•
Check all trim harness con-
nectors for loose or corroded
connections.
•
Check trim switch.
Connect Voltmeter red lead to
Point 3 and black lead to
ground. Battery voltage should
be indicated.
There is an open circuit in wire
between Point 5 and Red ter-
minal on the back of the ignition
switch.
Red wire is open between Point
3 and red terminal on back of
the ignition switch.
Check that voltage is being
supplied to control by performing
the following checks:
Connect red Voltmeter lead to
Point 5, and black lead to
ground.
Trim switch is faulty or there is an
open circuit in wires (green-white,
blue-white) between trim buttons
and trim pump.