7.4 Startup / Idle 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.4.11 Air conditioning idle up
The MS3Pro can control the air conditioning and increase the idle speed when the air conditioning is active.
• A/C idleup on - Allows the MS3Pro to control the A/C or increase idle speed when the A/C is on.
• Idle-up output - This uses an output pin to activate the A/C compressor and/or condenser fan.
• Idle-up input - This is the input used to tell the MS3Pro that the air conditioning is on or needs to be turned
on.
• Input Polarity
– Normal: The A/C switch grounds the ECU input to trigger the A/C.
– Inverted: The A/C switch sends 12 volts to the ECU to trigger the A/C.
• Idle-up Delay - The amount of time between receiving a signal on the idleup input and increasing the idle
valve opening.
• Idle-up min RPM - The lowest RPM where the A/C can run. If the RPM falls below this point, the A/C output
is turned off.
• Compressor delay since last on - The minimum amount of time between turning the idleup output off and
turning it back on. Use this to prevent excessively rapid cycling of the compressor.
• Idle-up duty / idle-up steps - The amount to increase the idle valve opening when the A/C is on.
• Idleup target RPM adder - You can either set this to zero to make the MS3Pro hold a constant RPM when
the A/C engages, or use this to increase the RPM to better drive the compressor. This feature requires closed
loop idle to be on.
• Idleup CL load allowance - The engine may be under more load when decelerating with the A/C on. This
number is added to the PID lockout max decel load when the idleup input is on.
• TPS shutoff enable - While most OEM ECUs shut the air conditioning off at full throttle to free up horsepower,
the MS3Pro allows you to decide if you want to leave the A/C on full time, which can be useful for hot track
days. Setting this to on will let the MS3Pro shut the A/C off above a set TPS value.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 190
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