AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 126)

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© 2014 AEM Performance Electronics
Infinity User Manual
Idle Air Control
The following tables and options affect the basic functions of the idle air control strategy. Please
see the
Idle - Advanced section for more details.
IdleTargetTable
Units: Coolant Temp vs Idle Target [RPM]
Description: This is first step in the idle calculation. This table sets the desired Engine Speed
for idling, depending on coolant temperature. For most vehicles, the desired idle target will be
increased when coolant temperature is low.
IdleBasePosition
Units: Coolant Temp vs Idle Position %
Description: This is the second* step in the idle calculation. Depending on the desired Idle
Target RPM, this table sets the initial open loop idle position that will be used to reach the
desired idle RPM. This happens before any closed-loop idle feedback.
(* In addition to the IdleTargetTable, there are actually a few other factors that help determine
IdleTarget [RPM]. Please see the
Idle - Advanced section for more details.)
IdleFB_Active
This is the third step in the idle calculation. If the engine speed and throttle position meet certain
conditions, this channel will turn on and the ECU will use closed-loop idle feedback to try and get
the engine speed closer to the idle target RPM.
IdleFB
Units: Idle Position %
This is the fourth step in the idle calculation. When IdleFB_Active is on, the ECU will check the
difference between the desired IdleTarget [RPM] and the measured EngineSpeed [RPM]. If
the measured engine speed is not close enough to the desired idle RPM, the ECU will try to
adjust the amount of idle airflow to adjust EngineSpeed. The amount of closed-loop feedback
that is currently being used to adjust airflow gets calculated by the ECU and is displayed as this
value, IdleFB.
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