• Ensure that the enclosure of the ECU is grounded with at least two metal screws onto the
metal body of the car. If the ECU is not bolted directly onto an earthed metal surface, you
MUST make sure that you run a 4mm
2
ground wire to one of the ECU’s bolt holes,
otherwise your ECU will not power up and you will damage the MAP sensor permanently.
There may flow as much as 30A through the earth wire.
• Connect the two black wires firmly to the enclosure base. This is the screens of all the
cables and also the ground wires of the TPS Lambda and temperature sensors. Bad
connections may damage the sensors.
• Feed all wires of the harness, except the serial cable, through a hole in the firewall. A good
seal around the wiring is necessary to prevent damage and engine fumes and water from
entering the cockpit.
• Each cable in the harness is marked to where it has to go. The same name is on the
electrical drawing. Wire colors are marked on the drawing for specific pin connections. Take
special care for TPS wiring as a fault here may damage the voltage regulator on the ECU.
• Pull additional PVC sleeve over the cables for extra protection of the harnesses. This
sleeve is customized on your installation and dependant on routing of the cables.
• Mount the MAP sensor on the back of the fire wall. It should be higher than the vacuum
takeoff so that fuel condensate in the hose can run back into the engine and not to the
sensor. Try mounting the inlet pipe downwards to keep the sensor clean.
• The screened cables for the sensors must go to the sensor and connected as close as
possible. Connecting these wires to existing harness on the engine will cause the wires to
pick up electrical interference and cause erratic behavior of the ECU.
• No screen wires may be connected or earthed to the engine. They are connected on the
ECU side to the enclosure. On the Stepper Idle control board the screen wire is connected
to 12V. Make sure it is not earthed.
• Test each harness according to the drawing or to the optional test procedure to ensure
correct wiring, before connecting the ECU. This will indicate installation errors beforehand
which may damage the ECU.
• Plug the harness into the ECU and taking care not to damage the pins and connectors. If it
is sticky do not force it in. Rather move the connector slightly from side to side till it mates
with the ECU connector pins.
• All power electronic components such as fuel pumps, coils fans etc must be wired via a
relay circuit directly from the battery with separate fuses in the positive supply for
protection. Do not wire any of these devices directly from the Ignition switch or on the same
circuit as the ECU. This will cause spikes which may damage or influence correct operation
of equipment. Earth connections must be as short as possible to earth and not connected to
a common earth wire which is connected at a distant ground.
• Make sure that the correct wire thickness is used for each power electronic component. If
wires are common ensure that the wire is thick enough to carry the total current. Too thin
wires will heat up and may start a fire. The same goes for relays. Be careful of cheap
relays. They can seize and start a fire. Use 0.5mm
2
of wire for every 5A of current. Also
check pin numbers of the relays as they differ from one manufacturer to the other. This
mistake may be costly!
• Solder each connection and use shrink sleeve rather than insulation tape. Stagger solder
joins so that they do not sit next to each other. Cover connections and loose wires with PVC
or pigtail sleeve rather than insulation tape.
• Ensure that all electronic settings are correct before connecting the 10Way connecter.
Certain settings may damage equipment if not set to recommendations. Especially the coil
output trigger level. Follow the start-up procedure.
• Ensure a proper ground from battery negative to the body and from battery negative to the
engine. This wire must be thick enough to carry the current of all the equipment in the car.
4.5 Injectors
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