1.4 Tools 1 INTRODUCTION
Another use for the MicroSquirt is to run the IO Box firmware. This turns the MicroSquirt into an I/O expansion
device, adding additional analog inputs as well as on/off or PWM outputs. The MS3Pro can accommodate up
to three MicroSquirts running IO Box firmware, daisy chained together. The IO Box firmware adds the following
inputs to the MS3Pro:
• 7 0-5V analog inputs
• 2 VR inputs
• 3 switched inputs
• 7 PWM or on/off outputs
1.3.6 HSD-4 High Side Driver module
While the standard MS3Pro outputs supply ground, a few types of solenoid ground through their housing or other-
wise require the ECU to switch 12 volts. Examples include BMW’s Double VANOS solenoids and the transmission
shift solenoids on a Toyota A340. The HSD-4 accepts up to four ground triggered signals and uses this to supply
high speed switched 12 volt signals. Maximum current is 8 amps per channel.
1.3.7 Peak and hold driver module
The original MS3Pro injector outputs are set up to run high impedance injectors. If you need to run low impedance
injectors, use our external peak and hold driver module. This module connects in between the injector outputs and
the injectors, and uses current sensing to limit the injector current. There are two separate versions, one with 8
peak amps and 2 amps hold current, and one set up for 4 peak amps and 1 amp hold current.
1.4 Tools
As a general rule, you’ll want to have the following tools and supplies on hand for a successful MS3Pro installation:
• Multimeter
• Laptop (the MS3Pro software supports Windows, Linux, or Mac OS)
• Screwdrivers
• Soldering iron, solder, and heat shrink tubing (if joining wires by soldering) or crimp connectors and crimp
tool
• Wire cutters
• Wire stripping tool
• Timing light
• Wideband O
2
sensor and controller (not needed for permanent installation, but useful for tuning)
• Electrical tape
• Vacuum tubing
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 15
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