Ford Workshop Service and Repair Manuals

The instrumentation for the Scorpio '95 is housed in either a high ‐ series or low ‐ series facia panel.

The main differences of the high ‐ series instrument panel over the low ‐ series are the additions of a trip computer in the instrument cluster and the heater control panel which has driver and passenger temperature selection switches. Other differences include switches and indicator/warning lights associated with options fitted to high ‐ series vehicles.

The instrument clusters have a printed circuit which connects into the main vehicle wiring loom via multiplugs.

The Scorpio '95 is fitted with an electronic speedometer head which receives signal information from the vehicle speed sensor. The tachometer senses from the low tension side of the ignition circuit in petrol variants and from the phase terminal on the alternator for diesel variants.

The air ‐ cored fuel and temperature gauges are operated by sender units located in the fuel tank and cylinder head, respectively.

The fuel tank sender unit consists of a float and a rheostat. The float is attached to a hinged arm which is connected to the rheostat moving contacts. As the float rises or falls according to the fuel level, the resistance of the rheostat varies and thus the voltage applied to the fuel gauge also varies to indicate the quantity of fuel in the tank.

Fuses and relays for the electrical systems are housed either in the central junction box located in the engine compartment on the driver's side or the auxiliary junction box located In the engine compartment on the passenger's side. For other relays not housed in these electrical boxes refer to the appropriate wiring diagram.

The hazard flashers, direction indicators and heated rear window and other high amperage circuits are wired through relays to reduce the required electrical capacity of the switches.

The multifunction switches mounted on the steering column incorporate on the left ‐ hand switch the direction indicators, headlamp flasher and main/dipped beam and on the right ‐ hand switch the front and rear wipers and washers, and headlamp wash when fitted.

A remote control switch/stalk is fitted on the left ‐ hand side adjacent to the direction indicator switch for vehicles fitted with remote radio facility.

The hazard flasher switch is mounted on top of the steering column shroud and is an integral part of the multifunction switch for the direction indicator.

The front and rear fog lamp switches are incorporated in the headlamp/side lamp switch as a multifunction switch.

The fuel tank sender unit for vehicles fitted with a trip computer incorporates two resistance tracks to operate the fuel gauge/low fuel warning and the trip computer.

The resistance track for the trip computer gives a resistance measured between ground and the output terminal which is proportional to the volume of the fuel in the tank.

The trip computer fitted to Scorpio '95 variants is contained within the instrument cluster.

The trip computer contains a microcomputer which has been programmed to run the whole system. It accepts data from the vehicles sensors and instructions from the driver, via the push buttons, and computes the appropriate information for the digital display selected.

The microcomputer makes extensive use of both data programmed into its memory during manufacture and temporary data obtained from the push buttons and sensors. Data concerning fuel and distance is continually updated from information obtained from the EEC V PCM, the fuel tank sender unit and the speed sensor. The computer has the ability to react quickly to any sudden variations in driving conditions and patterns.

The following function can be selected by pressing the function selection button:

The trip computer forms part of a complete fuel monitoring system consisting of:

The low air temperature warning sender unit supplies temperature information to the trip computer. The sender unit is mounted behind the front bumper assembly.

The low air temperature warning sender unit is a negative temperature coefficient thermistor. This is a resistor made of material with the property of reducing its resistance as the temperature increases. An 11k ohms resistor is wired in parallel with the thermistor to keep the range of resistance change to that which the trip computer can accommodate.

The interface module performs various tasks in different systems.

The module provides an audible beep for low distance to empty warnings and button press acknowledgement for the trip computer system.

The EEC V PCM itself generates a fuel flow signal. This is used by the fuel computer.

The multiplex system fitted to Scorpio '95 consists of up to four modules (dependent on equipment level).

Each module carries out specific functions in response to commands received from and provided to the central control module.

These commands are sent to and from modules via two common interconnecting wires. These wires carry coded information, known as `Messages', for specific module(s) action. These messages are responded to or ignored depending on the identification code, allowing a number or functions to be carried out simultaneously.

The central junction box (1) is located in the engine compartment on the driver's side, the battery junction box (2) on the passenger's side (left ‐ hand drive vehicle shown).

Always renew a faulty fuse with a new one of the same rating.

The junction boxes contain the main fuses and relays. The circuits protected are identified by numbers on the junction box and additionally with symbols on the inside of the cover.

To check or renew a fuse or a relay unlock the catches (1) of the cover and lift it off. A blown fuse can be identified by a break in the wire. All fuses are a push fit. Use the fuse puller attached to the cover of the junction box.

To close the central junction box insert the cover lugs (2) and press them in until the catches (1) engage audibly.

To close the battery junction box insert the cover lug (2) and depress the cover first in area (3) and then in area (4) until the catch (1) engages audibly.

Five spare fuses with different current ratings are attached to the inside of the cover of the battery junction box.

Overloading can cause a temporary interruption of the operation of the power windows or the electrically adjustable seats. In case of permanent interruption check the corresponding fuse.