Trip Computer: Description and Operation

TRIP COMPUTER





DESCRIPTION

The trip computer records fuel usage, time and distance. By storing the three sets of information and relating one to another it computes fuel consumption, both average consumption for the journey or a current consumption figure updated every three seconds.

The information may be displayed either in miles and gallons or litres and kilometers.

The signals required to operate the trip computer are picked up from the ECU via the interface unit (2 Fig 1) and the pulse generat9r (3 Fig 1). A 12 volt supply is via the fuse (5 Fig 1). This supply voltage enable the clock to function and for the computer to retain information it has received when the ignition is switched off.

A second 12 volt supply is via fuse (8 Fig 1) this supply enables the computer to display information when the ignition is switched on. The third 12 volt supply is via the red and blue lead (4 Fig 1). This supply voltage enables the display and the buttons to dim when the sidelamps are switched on. The legend strip is also illuminated.

TRIP COMPUTER CONTROLS

There are nine controls on the computer face:
mls/km - Use this switch to display metric or imperial/US units.
RESET - Press for 5 seconds to switch all function displays to zero.
DISP - Press to switch display off (function updating continues).
TIME - Press to di play time of day - press again to display elapsed time since reset - after 6 seconds, display will revert to time of day.
AV SPD - Press to display average speed since reset.
DIST - Press to display distance travelled since reset.
AVE - Press to display average fuel consumption since reset.
INST - Press to display the fuel consumption at that time.
FUEL - Press to display fuel consumed since reset.

To show which function is on display the relevant button will be illuminated. When the vehicle lights are switched on the computer illumination is dimmed but the legend plate is illuminated.