AEM 30-6311 Series 2 Plug & Play EMS - Manual (Page 6)

Page 6 of 12
WARNING:
* The factory A/C request switch sends 12V power to signal an A/C request and the 30-
6311 EMS has been designed to accept 12V power on this switched input. If users desire
to re-wire a new switch to trigger the Switch 2 input the switch should connect to 12V
power when the switch is on. The pin can be left floating (disconnected) when the switch is
off, it is not required to send ground to this pin.
**All other switch input pins must connect to ground; the switch should not provide 12V
power to the EMS because that will not be detected as on or off. Connecting 12V power to
the Switch 3, Switch 4 or Switch 5 pins may damage your EMS and void your warranty.
Wiring harness destinations for non-USDM vehicles may be different than listed in the
pinout charts below. If installing this EMS on a vehicle not originally sold in the US, please
verify that the vehicle’s wiring harness matches the pinout shown here.
The function of the following pins have been changed from the original 30-1311 EMS,
please see pinout chart for more info:
80(51), 81(52), 82 (53), 85(56), 89(60), 90(61), 91(62), 104(34), 114(44)
Primary Load Sensor, EMS Fuel Strategy
The factory MAF (mass air flow) sensor can be removed to help decrease intake air
restriction; the EMS can be configured to use a MAP sensor to determine engine load.
It is recommended to use a 3.5 bar MAP sensor or higher (P/N 30-2130-50).Please be
aware that the IAT (intake air temperature) sensor is integrated into the factory MAF
sensor. If the factory MAF / IAT sensor is removed, you may wish to install an AEM IAT
Sensor Kit (P/N 30-2010), which includes a sensor, wire connector, and aluminum weld-in
bung. While the factory MAF sensor locates the IAT sensor upstream of the turbocharger
inlet, it may be preferable to install an IAT sensor downstream of the intercooler to
accurately measure charge temperatures.
The factory Mass Air Flow and Intake Air Temperature sensors can be used as the
primary load input for the AEM EMS if desired. Please check the Notes section of each
calibration for more info about the vehicle setup and fuel strategy that calibration was
configured to use.
EMS Fuel Map, Boost Fuel Trim Table
The 30-6311 maps provided utilize the “Boost Fuel Trim Table” to provide a 1:1 fuel
compensation above and below atmospheric pressure. In the startup calibration, the
“Boost Fuel TrimTable” is configured to provide twice as much fuel when the manifold
pressure is twice as high and half the fuel when the manifold pressure is half as high; this
should help simplify the tuning process for different vacuum and boost levels. Notice the
values in the main “Fuel Map” do not change above 100 kPa (0 psi boost), the fuel
correction is being made by the “Boost Fuel Trim Table.”
Note: the “Boost Fuel Trim Table” must be adjusted if a different MAP sensor is installed or
if the Load breakpoints are adjusted. The Boost Fuel Correct value should be set to -90 at
10kPa, 0 at 100 kPa, +100 at 200 kPa, +200 at 300 kPa, etc…