General Information (VDO)

The Yazaki Instrument Panel has no trip computer as there is no microprocessor within it. This information, therefore, applies only to VDO Instrument Panels. For instrument panel identification, Application and ID

Data Collection:

The trip computer receives data which is continuously evaluated by a micro-processor. The following data is used by the trip computer:
- Current vehicle speed;
Information from the speedometer
- Current fuel consumption;
Fuel pulse signals from ignition control module (ICM)
- Fuel remaining in the fuel tank;
Signal from fuel gauge after processing in the combined instrument panel
- Outside temperature;
Signal from outside temperature sensor.

Functions:

The trip computer display has two fields. The left displays the time and the right displays one of the following functions:
- Average speed
- Current fuel consumption
- Average fuel consumption since last reset
- Outside temperature
- Mileage since last reset
- Range to empty fuel tank.

Function Select:

If the buttons to the left of the display are pressed in at the same time the temperature and time display change as follows:
- 1 press: 12 hour clock and °F
- 2 presses: 24 hour clock and °F
- 3 presses: 12 hour and °C
- 4 presses: 24 hour and °C
These four variants occur in different orders depending on the market.

Reset:

Function is selected with a separate control panel to one side of the steering wheel. Turn the switch marked INFO to the required position. A rectangular cursor at the edge of the display beside the relevant function symbol, indicates the function selected.

Selecting Units:

Average speed, average fuel consumption and the trip odometer are reset with a button marked RESET at the bottom of the control panel. Turn the switch to the required function and press the RESET button for at least two seconds to reset the function. To reset all RESET functions hold the RESET button for another three seconds.

Automatic resetting:
- All values except maximum speed can be reset manually with the RESET button. If the trip odometer, average fuel consumption and average speed are not reset manually they will be reset automatically in the trip computer as follows:
- When the trip odometer mileage exceeds 10,000 km/miles the trip computer trip odometer is reset. After resetting the trip computer starts a new mileage count for the trip odometer.
- When the average speed mileage exceeds 10,000 km/miles or total driving time exceeds 1,600 hours, the trip computer average speed is reset. After resetting the trip computer starts calculating a new average speed.
- When the average fuel consumption mileage exceeds 10,000 km/miles or total fuel consumption exceeds 5,000 liters (1319 US gal), the trip computer average fuel consumption is reset. After resetting "-----" is displayed in the trip computer display until the car has been driven 200 meters (655 ft). The trip computer then starts calculating a new average fuel consumption.
- When the trip computer registers that speed exceeds 280 km/h (174 mph) the trip odometer, average fuel consumption and average speed are reset in the trip computer.

Warning Function:

The trip computer has a built-in warning function for low fuel level and outside temperature. When the outside temperature is within the range + 2°C to -5°C (36 to 23°F) a warning lamp lights and the outside temperature is displayed. The low outside temperature warning always has the highest priority. The INFO switch must be used to return to the last function selected.

Diagnosis:

The trip computer has an on-board diagnostic system which can detect three types of fault:
- If the function selector switch is not connected then "DISC is displayed.
- If the outside temperature sensor is not connected or there is a short-circuit to ground in its circuit then "LO" is displayed.
- If there is a short-circuit to supply voltage in the outside temperature sensor circuit then "HI" is displayed.
The fuel tank volume signal from the combined instrument panel to the trip computer is also diagnosed. Diagnostic trouble code (DTC) CI-133 is stored in the combined instrument panel on-board diagnostic (OBD) system if there is a short-circuit to supply voltage in the signal cable.