9000 L4-1985cc 2.0L DOHC Turbo EFI (1987)
Instantaneous and average fuel consumption
Range with remaining fuel
Battery voltage and condition
Ambient temperature
Right-hand part, upper half
Gear selected (for cars with automatic transmission)
Right-hand part, lower half
"CHECK ENGINE" (Fault in fuel injection system)
"CHECK OIL LEVEL" (Low oil level)
"CHECK RADIATOR LEVEL' (Low coolant level)
A fault code may also be displayed in the event of a fault. (See under "Fault-tracing hints".)
The various computer functions and the units (e.g. km or miles) used in displaying information are selected by means of the two buttons, R and INFO.
The buttons are mounted on clock 49, or on DCC trip computer 241 if the latter is fitted.
Trip computer 210 receives a constant supply from fuse 17, and is also supplied from fuse 13 when the ignition switch is in the drive position.
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.
To display the instantaneous or average fuel consumption, the trip computer requires information on:
the road speed, from speed transmitter sensor 132
the current fuel consumption from control unit 200 for the fuel injection system. The frequency of the control pulses supplied from the control unit
to the fuel injection valves (terminal 13) corresponds to the instantaneous consumption.
Fuel level transmitter 46 is connected to the trip computer in order to indicate the range or distance which can be covered with the fuel remaining in
the tank. Note that fuel gauge 47A receives its input signal from the trip computer (cable 663 GN) and not directly from the transmitter.
Information on the ambient temperature is provided by sensor 286, located behind the front spoiler. This temperature is not displayed by the EDU2 if
the DCC trip computer is fitted.
Warning signals for oil level and coolant level are obtained from level switches 243 and 242 respectively, which close if the level should drop below a
predetermined level. If a fault should occur in the fuel system, a warning signal (positive voltage) will be supplied from terminal 19 of control unit
200.
On cars with automatic transmission, the trip computer is connected to selector lever switch 245.
Fault-tracing hints
The trip computer will become operative when the ignition switch is turned to the drive position.
If no information at all is shown on the trip computer display, first check points 1-5 below. If a fault code appears on the display, check the list of
codes at the end of this section for clarification.
1. Check fuses 13 and 17 and check that the supply to them is live.
2. Check that the supply to pins 6 and 4 of the trip computer is live.
3. Check that the contact surfaces of the connectors are undamaged and clean. This is important since the currents involved are low.
4. Check the wiring and the earth connections.
5. Check the voltage at terminal 1 of sensor 132.
The self-diagnostics of the EDU2 may be used as an aid to fault tracing. If any of the following fault codes is displayed, locate and rectify the fault as
recommended in each case. (The code will disappear from the display when the fault has been rectified.)
F1 Fault in gear selection transmitter or associated wiring: All orange segments under PRND321 will light up simultaneously (on cars with automatic
transmission).
F2 Short-circuit in outside temperature sensor.
F3 Short-circuit in fuel level transmitter.
F4 Unreliable performance of the trip computer itself.
