amp e MS3Pro ULTIMATE - High Current Outputs; PWM Medium Current Outputs; Digital Output Pins

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3.3 Outputs 3 MS3PRO HARDWARE

Spark F

Spark B

Spark D

Spark A

Spark H

Spark C

Spark E

Spark G

Spark J

Spark I

100 ohm resistors

3.3.3 High current outputs

These are ground switched outputs with a maximum current of 5 amps. These can be run in an on/off fashion

or use pulse width modulation. Maximum frequency is 1021 Hz. Flyback voltage spikes are clamped at 36 volts

to help the valve close rapidly. They typically work well with boost control solenoids and nitrous solenoids, which

cycle fully off and fully on.

3.3.4 PWM medium current outputs

These are ground switched outputs, maximum current 3 amps. They are optimized for valves which use pulse width

modulation to hold them in an intermediate position instead of pulsing on and off. Flyback spikes are clamped at

battery voltage, which causes the valve to close more slowly. Common valves that would use these outputs include

idle air control valves and variable valve timing oil control valves. They can also be used as an on/off signal. The

fuel pump uses a similar circuit, although it does not use PWM. Maximum frequency on these outputs is 1021 Hz.

Note: Any device connected to these outputs must be set up so that it is powered off when the ECU is shut

down. Relays or solenoids connected to these outputs can back feed power into the MS3Pro if the relay coil or

solenoid winding receives power with the key on. Wire any device connected to these outputs to switched 12 volt

power.

3.3.5 Digital Output pins

The MS3Pro Ultimate’s digital switched outputs function in the same way as the PWM outputs, but their maximum

switching frequency is 78 Hz. They have the same maximum 3 amp current and are clamped to battery voltage.

AMP EFI MS3ProUltimate manual version 1.203, ﬁrmware 1.5.0, 5/23/2017 Page 28