The engine bay is a harsh environment for wiring harnesses with oil, water, solvents, high temperatures,
high vibration, and high electrical noise. The semi-assembled wiring harness is made from automotive
grade cable and the shielded cables are already made-up at the ECU connector to prevent electrical
noise problems.
The following should be noted when constructing the loom;
· The ECU should be mounted away from sources of extreme heat (such as exhaust), and
away from direct water spray.
· If the loom is to go through panels, grommets should be used.
· The looming material holding the wires in the loom should totally cover the wires to
prevent chaffing of the wire insulation.
· To minimize electrical interference, the sensors should be in a separately loomed section
of the harness to the injectors and ignition coils.
· The connector terminals should be either crimped with the correct tool or crimped and
soldered. Do not allow solder to go into the non-crimped section of the cable as this
makes the cable brittle.
· Any joins should if possible be covered by a mechanically stiff material such as heatshrink.
· Care should be taken if using Raychem DR-25 heatshrink or glue lined heatshrink as the
shrink temperature of these materials is high and it is possible to melt the cable insulation
when shrinking these materials.
· The loom should be tied to mounting points using cable ties or p-clips to limit the
additional stresses of the loom moving.
Please see the notes supplied with the harness.
OMEM200 Installation Manual 2v10
21
3.1 Semi Assembled Loom Construction
3.2 Ready Built Harness
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