650066
8
FUEL
The fuel gauge sending unit is not normally supplied with the system. The display
system will usually use the fuel sending unit that is already in the tank. The sending units that
are compatible with this system are as follows: GM, Ford, VDO, and Stewart Warner. It is also
possible to program in a custom setting for senders that are not pre-programmed into the
system. The Stewart Warner sender type is used by most after-market gauges. A single wire
should be run from the fuel sender to the control box terminal marked FUEL. If your wiring
harness already has a wire routed through the vehicle for the fuel sender then it may be used. If
using a wire from an existing harness, make sure that the wire does not have power. The fuel
sender gets power from the control box only. Fuel senders get their ground from the sender
mounting plate. Make sure that a ground wire is connected from one of the sender mounting
bolts to the vehicle frame.
The fuel sender type is selected using the setup menu under “FUEL”. The settings are
discussed later in the section on internal adjustments. Anytime the fuel level is below 10% the
reading will flash as a warning of low fuel.
The fuel gauge will initially display “FL” until the fuel sender type has been set. If the fuel
display shows “—“ this indicates that the control box is sensing a short to ground or out-of-range
error from the sender or sender wire. If the fuel display shows “EE” this indicates that the
control box is sensing an open circuit or out-of-range error from the sender. If either indication
remains on the display, inspect the sender wire for damage, check the routing of the sender
wire, check the sending unit grounding, and check that the sender selection is set correctly for
the sending unit that is connected.
CHECK
The check engine terminal is used with fuel injection ECM’s to display engine problems
and trouble codes. The CHECK input is activated by a ground signal from the ECM. Whenever
the check input is grounded the system will display “ENGINE” on the message display. This
message can be cleared by pressing and holding switch 2.
When the ECM is placed into diagnostic mode trouble codes can be read by counting the
flashes. Consult a service manual for the fuel injection system that you have for further
information on trouble codes.
With some ECM’s a 12 volt light bulb may need to be connected in addition to our
CHECK input in order to provide proper current loading. In this case both the bulb and our
display system indicator would both come on when the check engine wire was set.
BRAKE
The BRAKE terminal can be used as a brake system warning indicator. The BRAKE
input is activated by a ground signal from the brake pressure switch on the master cylinder or
from the parking brake set switch. Connect a wire from this terminal to the pressure switch on
the master cylinder or consult a vehicle service manual to determine color and location of an
existing wire. Whenever the BRAKE input is grounded the system will display “BRAKE” on the
message display. This message can be cleared by pressing and holding switch 2.
CRUISE
The CRUISE terminal can be used as a cruise engaged indicator. The CRUISE input is
activated by a ground signal from a compatible cruise control harness. Whenever the CRUISE
input is grounded the system will display a small “c” to the right of the speedometer
Summary of Contents for VFD3
Page 13: ...650066 11...
