FT500 SFI / FT500LITE SFI
10
4.3 Output table of FT500
Wire
color
Output type
Max current
for negative
activation (0V) for
each output
Max current for
positive activation
for each output
Application
Notes
Blue
Open collector
(Lo side)
5A*
Can’t activate by
positive
Fuel injectors, relays,
solenoid valves
Drive loads always by negative
Gray
Open collector
with current
source in 5V
(Lo side)
1A*
30mA in 5V
Inductive ignition control,
fuel injectors, relays,
solenoid valves
Drive loads always by negative
Yellow
PUSH-PULL ou
HALF BRIDGE
5A*
5A** in 12V
Electronic throttle, step
motor, MSD/M&W and
other ignitions activated
by 12V
When used to control relays,
valves or any other load by
negative, there is a risk of 12V
return to the ECU. This will keep
the ECU always powered on.
In this case, an external diode
or a relay with built-in diode is
required for protection.
*
Total max current combined with all outputs driving loads by negative: 15A continuous
** Total max current combined with all outputs driving loads by positive: 5A continuous
NOTE:
Blue outputs cannot control ignition because they do not have a pullup resistor.
Characteristics