On-board computer — description, replacement of parts (Opel Ascona C)

1. The on-board computer is installed on some later models. Fuel consumption and mileage data are collected and evaluated over time, so the computer provides fuel consumption information (and at each specific moment in time, and the average value of consumption), average speed and remaining fuel. There is also a clock and timer, and an outside temperature sensor.

2. Refer to the owner's manual that came with your vehicle for detailed operating instructions.

3. Although checking a computer and its components is beyond the scope of the average DIYer, there is no reason why you shouldn't replace faulty components yourself.

Replacement of components

Computer relay

4. The on-board computer relay is mounted on the bottom of the fuse box (see Figure 12.47).



5. Remove the bottom panel if necessary to access the relay, and disconnect the relay from its socket.

6. Insert the new relay and replace the panel.

Temperature sensor

Material copied from this portal: Opelbook.ru

7. The temperature sensor is located under the left front fender. Disconnect the electrical connector and remove the sensor from its cap.

8. Install the new sensor into the cap and connect the electrical connector.

Distance sensor

9. The distance sensor is screwed into the drive on the transmission; the cable is screwed into the back of the sensor.

10. Unscrew the speedometer cable from the sensor. Disconnect the wiring harness from the sensor and remove the sensor from the transmission.

11. Install the new sensor, making sure it is the same type as the one removed (sensors marked 12 V 15 IMP operate in the frequency divider at the top of the engine; sensors marked 12 V 8 IMP work directly in the computer). Connect the wiring plug and the speedometer cable.

Computer

12. To remove the computer itself, first remove the front switch panel.

13. Slide the computer out of the panel and disconnect the multi-plug electrical wiring.

14. Reinstall by following the above steps in reverse order, but note that the computer must be calibrated according to the vehicle model. And this must be done by a GM dealer.

Computer display backlight

15. Remove the computer as described above.

16. Remove the light bulb holder from the top of the computer by twisting it with pliers. Replace the light bulb.

17. Install the bulb holder. Check that the newly installed light bulb works (with the computer connected and the lights on) before reinstalling the front switch panel.