Trip Computer: Description and Operation

BOARD COMPUTER

System Description

FUNCTION
This board computer can indicate following items.
- Outside air temperature
- Range (Cruising possible distance)
- Journey time (hour meter)
- Average fuel consumption
- Average vehicle speed

Outside air temperature indication
- This indicator shows indication of outside air temperature while ignition switch is in ON position.
- Ambient sensor is used commonly by auto air conditioner and this board computer. When auto air conditioner operates board computer will correct ambient sensor signal based on positive voltage signal to terminal 60 of board computer from A/C auto amp.
- Indication range is between -30 and +55°C (-22 and 131°F). (When outside temperature is less than -30°C (-22°F) or more than +55°C (131°F) display shows "----".)
- When outside temperature is less than 3°C (37°F) continuously display will blink as a warning. In this case the display will change to the OUTSIDE AIR TEMPERATURE mode even though the display is showing a different item. (See NOTE.)
- The indicated temperature is not affected by engine heat. It changes only when one of the following condition exists.

a. When vehicle speed is more than 20 km/h (12 MPH).
b. The ignition key has been turned to OFF position for more than 3.5 hours.
c. When outside temperature is lower than indicated temperature.

Range (Cruising possible distance) indication
- The range indication provides driver with an estimation of the distance that can be driven before refueling. The range is conducted by fuel tank gauge unit (fuel remaining) ECM pulse signal (fuel consumption) and vehicle speed signal.
- Indication will be refreshed every 30 seconds.
- When fuel remaining is less than approx. 10.8 l (11 - 3/8 US qt 9 - 1/2 Imp qt) indication will blink as a warning. If the fuel remaining less than approx. 10.5 l (11 - 1/8 US qt 9 - 1/4 Imp qt) indication will show "----". In this case the display will change to the RANGE mode automatically even though the display is showing a different item. (See NOTE.)

Average fuel consumption
- Average fuel consumption indication is conducted by ECM pulse signal and vehicle speed signal after system is reset.
- Indication will be refreshed every 30 seconds.
- After reset operation the display shows until the vehicle is driven 500 m (1,600 ft) and 30 seconds has passed.

Average vehicle speed
- Average vehicle speed indication is conducted by running distance and running time.
- Indication will be refreshed every 30 seconds.
- After reset operation the displays shows for 30 seconds.

Journey time
- Journey time indication is conducted by integration of ignition ON time.

HOW TO CHANGE/RESET INDICATION
- Indication can be changed by in following order by pushing board computer steering switch TRIP".
OUTSIDE AIR TEMPERATURE -> RANGE -> AVERAGE FUEL CONSUMPTION -> AVERAGE VEHICLE SPEED -> JOURNEY TIME
- Continuous pushing the switch (more than 0.8 second) can reset the indication of journey time (hour meter), average vehicle speed and average fuel consumption.

NOTE:
- After the display changes automatically, the indication can be changed to the last mode by pushing the board computer steering switch. In this case, the cursor ("A") will blink as a warning.
- When the OUTSIDE AIR TEMPERATURE warning and the RANGE warning match warning conditions at the same time, the display automatically indicates the OUTSIDE AIR TEMPERATURE.