Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 10)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 10
Harness
Label
Wire
Color/Connector
Type
Label
Definition
Connect To Further Details
HEI Black, 4-way
Packard
connector
High Energy
Ignition
[Original
Equipment
(OE) ignition] Connect to GM
factory installed
ignition system. Inductive pickup
ignitions will not use
this connection! See
paragraph below titled
“HEI” for further
relevant information.
Ignition
Cam Gray, 2-way
Packard
connector with a
separate ground
wire (3/8” ring
terminal)
Camshaft
Position
Sensor Input Connect to the
camshaft
position sensor
on the engine Used only for injector
phase angle and
individual cylinder
spark control. System
includes a mating 2-
way Packard
connector & terminals.
Cam
Crank Black, 2-way
Packard
connector with a
separate ground
wire (3/8” ring
terminal)
Crankshaft
Position
Sensor Input Connect to the
crankshaft
position sensor
on the engine System includes a
mating 2-way Packard
connector & terminals.
Crank
H2O Black, 2-way
Packard
connector.
Engine
Cooling Fluid
Temperature
Input Connect to the
GM (only)
coolant temp.
sensor, typically
located on the
intake manifold Coolant_Temperature
Air Gray, 2-way
Packard
connector.
Engine Intake
Air
Temperature
Input Connect to the
GM (only) air
temp. sensor
typically located
in the air intake
duct between the
air cleaner and
the throttle body Air_Temperature
IAC Black, 4-way
Packard
connector
Idle Air Speed
Control (IAC)
input Connect to the
IAC motor assy
located on or
near the throttle
body. Meters and controls
intake air around the
throttle blades at idle
and during cold starts.
IAC
TPS Black, 3-way
Packard
connector
Throttle
Position
Sensor The TPS located
at the end of the
throttle shaft on
the throttle body Senses the position of
the throttle blades [0%
(throttle closed) to
100% (throttle wide
open).
TPS