AEM 30-6821 Series 2 Plug & Play EMS - Manual (Page 13)

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1) Install AEMTuner software onto your PC
The latest version of the AEMTuner software can be downloaded from the AEMTuner
section of the AEM Performance Electronics forums found at www.aemelectronics.com
Series 2 units are not supported by the older AEMPro tuning software.
2) Remove the Stock Engine Control Unit
a) Disconnect negative terminal from battery
b) Access the stock Engine Control Unit (ECU). The location of the ECU on the WRX is
underneath the passenger side floorboard. A 10mm socket is required to remove the
kick panel that covers the stock ECU.
c) Carefully disconnect the wiring harness from the ECU. Avoid excessive stress or
pulling on the wires, as this may damage the wiring harness. All connectors must be
removed without damage to work properly with the AEM ECU. Do not cut any of the
wires in the factory wiring harness to remove them.
d) Remove the fasteners securing the ECU to the car body, and set them aside. Do not
destroy or discard the original ECU, as it can be reinstalled easily for street use and
troubleshooting.
3) Install the AEM Engine Management System
a) Plug the factory wiring harness into the AEM EMS and position it so the wires are not
pulled tight or stressed in any manner. Secure the EMS with the provided Velcro
fasteners.
b) Reconnect the negative battery terminal.
c) Plug the communications cable into the EMS and into your PC.
d) Turn the ignition on, but do not attempt to start the engine.
e) At the time these instructions were written, new EMS units do not require USB drivers
to be installed on the PC. The EMS will automatically be detected as a human
interface device (HID).
f) With the AEMTuner software open, select ECU>>Upload Calibration to upload the
startup calibration file (.cal) that most closely matches the vehicle’s configuration to
be tuned. Check the Notes section of the calibration for more info about the vehicle it
was configured for. These files can be found in the following folder:
C:\Program Files\AEM\AEMTuner\Calibrations\AEM Updates\Subaru\
g) Set the throttle range: Select Wizards>>Set Throttle Range and follow the on-screen
instructions. When finished, check that th
e ‘Throttle’ channel never indicates less
than 0.2% or greater than 99.8%, this is considered a sensor error and may cause
some functions including idle feedback and acceleration fuel to operate incorrectly.