AEM 30-3703 Infinity-8/10/12 Mini-Harness - Manual (Page 9)

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© 2014 AEM Performance Electronics
5 Installation Notes
Wiring Conventions and EMI
Some wire harness assemblies come pre-wired with all connectors, fuses, and relays
needed to operate an engine. Harnesses that include a PDC generally require
extension/termination of the flying leads to their appropriate devices, and additional
sensors and other devices can be wired into the harness as needed for the specific
application. The following guidelines should be adhered to while completing the required
wiring.
A proper wiring job includes proper termination of the wire at the sensor. The wire
terminal end must be moisture tight where it plugs into the sensor and it must have
strong, electrically sound terminals. The preferred method of securing a wire to a
terminal is to use a crimp terminal with NO solder. It is important to use the proper
crimping tool for sound terminal construction. Plastic terminal plugs must have moisture
tight seals. Inspect each plug to make sure the seals are in place. Di-electric grease can
be added in the terminal slots to further aid in corrosion resistance.
If a splice into a wire must be made and no solder-less terminals are available, then you
must properly solder the splice.
Noise can be a serious problem and can cause intermittent misfiring of the engine.
Every precaution should be taken to prevent interference to the ECU’s operation.
Resistive plug leads are REQUIRED.
To eliminate or reduce the chance of EMI, wires that carry high current must run in
twisted pairs. An example of this would be the power leads from a multiple spark ignition
system. These ignition systems can carry up to 100 amps for a couple milliseconds at
the time of discharge, which induces a strong magnetic field in close proximity of the
wires.
The routing of the wire loom is critical to EFI system performance and safety. The
following safety considerations should be made when installing the wire loom:
Heat protection: the loom should be placed away from or insulated from sources
of heat. The obvious item(s) that should be avoided are the exhaust manifolds,
EGR delivery tubes, and turbochargers. If it is absolutely necessary to route a
wire in close proximity to any of these items, then a suitable insulator must be
used.
Noise suppression: do not route wires near the HT leads. For coil-on-plug ignition
systems this is not as critical.
Moving component protection: route wires away from moving components such
as fans, the blower belt, or the throttle linkage. Also, make sure the wires are not
under any strain when the engine is at full deflection on the motor mounts.
Never have the wires in exposed bundles throughout the engine compartment.
Determining ECU Location
It is recommended that the ECU be placed in an environment that does not