EDU1 Trip Computer and Clock

EDU1 Trip Computer And Clock Diagrams:

EDU1 Trip Computer And Clock Components:

Locations of components

3 Earthing point, facia
At the left-hand front speaker socket

16 Instrument lighting rheostat
On the left-hand side of the facia

20 Ignition switch
On the right-hand side of the steering Column

22A Fuse board
Behind the access panel in the glove compartment

49/241 Clock/DCC trip computer
On the right-hand side of the instrument panel

57 Three-pole connector
One on the clock
One behind the combined instrument

59 Two-pole connector for ambient temperature sensor
Behind the front spoiler, on the left-hand side

67 Six-pole connector
In the engine compartment, at the windscreen wiper motor

110 Tachometer
In the combined instrument

122 Eight-pole connector
Three behind the combined instrument

132 Sensor for the speed transmitter
In the speedometer, in the combined instrument

159 Distribution terminal +15
In the electrical distribution box behind the glove compartment

200 Control unit for the fuel injection system
On the left-hand side of the engine compartment, at the bulkhead

210 Voltmeter, fuel consumption instrument
In the combined instrument

230 Distribution terminal +30
In the electrical distribution box behind the glove compartment

244 Connection for heater
In the centre console, behind the facia

Operation
Voltmeter and fuel consumption instrument 210 (EDU1) forms part of an electronic digital display which provides information on the fuel consumption of the car and the voltage of the electrical system. The display is located below the speedometer.

Instrument 210, control unit 200 for the fuel injection system and sensor 132 will be energized across fuse 13 when the ignition switch is set to the drive position. The instrument and clock 49 are also continuously supplied from fuse 17 (independent of the ignition switch position).

The following values can be successively accessed by depressing the INFO button below the clock:

Instantaneous fuel consumption

Mean fuel consumption in liters/100 km or mph..

Voltage of the electrical system

To be able to calculate the values shown on the display, the instrument must be supplied with information on the speed of the car and its fuel consumption.

Information on the speed of the car is obtained from sensor 132 in the speedometer, whereas information on the fuel consumption is obtained from the control unit (terminal 13) of the fuel injection system. The control pulses from the control unit are used for the injection valves.

The brightness of the display under daylight conditions is controlled by a sensor mounted on the DCC unit or clock. In darkness, the brightness can be controlled by means of instrument lighting rheostat 16.

Fault-tracing hints
Voltmeter and fuel consumption instrument 210 will be energized when the ignition switch is set to the drive position.

1. Check fuses 13 and 17 and check that the supply to them is live.
2. Check that the contact surfaces of the connectors are undamaged and clean. This is important since the currents involved are low.
3. Check the wiring and the earth connections.
4. Check the voltage at terminal 1 of sensor 132.

NOTE:
If the EDU fails to operate properly, check the eight-pole connectors behind the combined instrument before replacing the EDU.

If one-half of the EDU fails to light up, check the bulb first.