LS Wiring Harness
10
7.5 Oil and Fuel Pressure
The oil and fuel pressure sensor connector are designed for the PS-
150, PS-300 and PS-1500 sensors; ranging from 150 to 1500 psi,
with a Packard style 3-way connector. It has a 5V ground and signal.
- Pin A: battery’s negative (black);
- Pin B: 5V supply (green/red);
- Pin C: signal output (white).
7.6 Injectors
The LS harness has 8 injector outputs available in 1 bank with three
different connectors options: EV1 (Jetronic/Minitimer), EV6/EV14
(USCAR), and Nippon Denso. It also features the OEM sub-harness
connector, in case you want to re-use the existing sub-harness.
7.7 Extra Connectors
There are two extra connectors with all the unused inputs and outputs.
One of them features 8 outputs (4 yellow and 4 gray) and the other
has 7 generic inputs (white color), a 5v output, a switched +12V
and a signal ground.
Extra Outputs Pinout
Pin FT500 Outputs Function/Sensor
A Gray #5
B Gray #6
C Gray #7
D Gray #8
E Yellow #4
F Yellow #3
G Yellow #2
H Yellow #1
Extra Inputs Pinout
Pin FT500 Outputs Function/Sensor
A White #1
B White #2
C White #3
D Signal ground
E 5V supply
F White #6
G Switched +12V
H White #8
J White #9
K White #10
Yellow outputs are HALF BRIDGE or PUSH PULL type outputs. This
means that they can feed 5A both by negative or positive side. They
are important and necessary to control Electronic drive-by-wire throttle
(DC motors) and stepper motor 4 wire idle control valves. They also
can be used to control any type of LO SIDE or HI SIDE actuator (LO
SIDE means the ECU will switch ground to activate the device, HI SIDE
means the ECU will switch 12V to active the device).
Since it can feed 12V power at 5A, if wired to a relay activating it
by ground (from the FuelTech) when turned off, it senses the 12V
through the relay coil and feeds back power to the ECU. In this case,
it is necessary to run a diode in series (1N4004 or 1N4007) like the
following schematic to avoid this issue.
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