Installation manual

Ford Racing Technical Support (800)FORD-788 - 12 -
M-12071-A50
REVISION 2
9.0 Enhanced Features
This harness has been carefully designed and developed primarily off of feedback derived
from performance enthusiasts who wanted a simple, yet fully functional, wiring solution for
their Street-Rods. A lot of careful thought and effort has been utilized to make this harness
very simple to install. One heavily favored option is that all necessary relays and fuses have
been packaged into a single location, referred to as the Fuse Relay Control Module. Quite
simply, this harness is cleanest and simplest wiring harness on the market.
9.1 Fuse Relay Control Module (FRCM): This is the central location where all of the
fuses and relays have been placed to minimize the bulk of wiring for a much
cleaner appearance under the hood. There are a number of additional features
which have been included within the FRCM:
A. LED Indicators: These have been included to assist in any potential trouble
shooting that may be required. When power is being passed through the relay,
the LED indicator will light GREEN.
B. Simple 1 Connector Hookup: With the exception of the main battery leads,
all of the required harness connections have been located in a single
connector. This ‘9-Pin Disconnect’ is conveniently located under the dash near
the computer for ease of installation to the necessary power and ground
connections.
The mating connector houses the wiring leads where all of the connections are
to be made. This feature allows the EFI Wiring Harness to be easily
disconnected from the vehicle without disrupting the solder joints if the engine
ever needs to be removed from the vehicle for any reason.
C. Dual Mode Self-Test Compatibility: With previous wiring harnesses, it has
been required to hook up a NEUTRAL SENSING switch if a diagnostic test
procedure was desired during a Key On Engine Running (KOER) mode. This
circuit has been integrated into the FRCM to eliminate the need for these
additional components and to save time on wiring this circuit.
Technical Tidbit: By default, the computer automatically assumes that the
vehicle is in gear. If the computer cannot determine if the vehicle is in neutral, it
will generate a code 67, and will not allow a diagnostic scan while the engine is
running. The FRCM has integrated a circuit which can be used to simulate the
vehicle being in neutral by simply depressing the yellow button located in the
upper left corner of the FRCM box, labeled “PUSH TO TEST”. By depressing
this button, this will complete a circuit between pin 30 and pin 46 in the
computer, simulating the signal the computer would normally receive when the
vehicle is in neutral. When this circuit is engaged, you will also have the ability
to do a ‘Cylinder Balance Test’. For a more thorough description of diagnostic
test procedures, refer to a Ford Powertrain Diagnostics/ Emissions Control
manual. This circuit can be reset to default by simply turning off the key.