AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual User Manual

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Infinity User Manual

Fuel Press

Typical Use: This is used for monitoring fuel pressure input to the Infinity. It can also be
used to increase or decrease injector fuel pulse to compensate for a failing fuel pump.
Notes: Typical electronic fuel injection fuel pressure varies from 30–100psi.
Component: AEM carries 0–5V fuel pressure sensors (sold separately).
Wiring: This wire goes directly to the signal wire of the pressure sensor.

Air Temp

Typical Use: Air temperature is typically used for fuel and ignition timing correction.
Notes: This is commonly not stuffed in the PnP aux connector because many vehicles
come standard with an intake air temperature sensor. These sensors are normally
thermistors.
Component: AEM carries air temperature sensors (sold separately). However, the Infinity
can accept any thermistor sensor and can be calibrated in the Infinity Tuner software.
Wiring: Intake air temp sensors have two wires and have no polarity.

Sensor Ground

Typical Use: Isolated ground for inputs.
Notes: This is not the same as a power ground or chassis ground.
Component: This is shared for the Fuel Press, Air Temp, MAP (Manifold Press),
Ethanol Sensor, and the Spare 1-Power Selector / Oil Press inputs.
Wiring: This should be wired to the ground pin of the following Fuel Press, Air Temp,
MAP (Manifold Press), Ethanol Sensor, and the Spare 1-Power Selector / Oil Press
sensors.

5V Reference

Typical Use: 5 volt supply for the following aux inputs.
Notes: When measured with a voltmeter, it is normally to not measure exactly 5V.
Component: This is shared for the Fuel Press, MAP (Manifold Press), Ethanol
Sensor, and the Spare 1-Power Selector / Oil Press inputs.
Wiring: This should be wired to the voltage reference pin of the following Fuel Press,
MAP (Manifold Press), Ethanol Sensor, and the Spare 1-Power Selector / Oil Press
sensors.

MAP (Manifold Press)

Typical Use: Manifold pressure is used for speed density fuel calculation and is used for
ignition timing correction, 02 feedback, boost control, variable valve control, ancillary
outputs, etc.
Notes: This is not always stuffed in the PnP aux connector because some vehicles come
standard with an manifold absolute pressure sensor.
Component: AEM carries MAP sensors (sold separately). However, the Infinity can
accept any 0–5V pressure sensor and can be calibrated in the Infinity Tuner software.
Wiring: This should be wired directly to the MAP sensor's signal pin.