Service manual

TRIP
The TRIP terminal is used for the trip odometer function, for setting the oil warning set
point (see WRN), and for speedometer calibration (see SPEEDOMETER CALIBRATION). The
TRIP input is activated by a ground connection. The push button switch supplied (or any
normally open switch) is wired by connecting one terminal to TRIP and the other terminal to a
ground. When the trip button is pressed, the odometer display will switch from full odometer
mileage to the trip mileage or from the trip mileage to the full odometer mileage. When the trip
mileage is shown a lower case “t” will be displayed to the left of the trip meter reading. “t 000.0”
RESET
The RESET terminal is used for the trip odometer function, for setting the water warning
set point (see WRN), and for the speedometer calibration (see SPEEDOMETER
CALIBRATION). The RESET input is activated by a ground connection. The push button
switch supplied (or any normally open switch) is wired by connecting one terminal to RESET
and the other terminal to a ground. When the reset button is pressed and held for a few
seconds, the trip miles will be reset to zero. This will not affect the full odometer mileage.
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 a lower case “c” to the right of the
speedometer. 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.