AEM 30-6100 Series 2 Plug & Play EMS - Manual (Page 7)

Page 7 of 12
This product is legal in California for racing vehicles only and should never be used on public highways.
Automatic Transmission Control
The A/T Gear Desired Up and A/T Gear Desired Down maps are used to determine which
gear the car should be in depending on Vehicle Speed and Throttle position. The startup
calibration is configured to shift gears earlier at low throttle percentages and later at high
throttle percentages; this will keep the engine at a lower RPM when cruising and a higher RPM
when accelerating. The Gear Desired Up map determines when to shift up during acceleration
or when the throttle is increased. The Gear Desired Down map determines when to shift down
during deceleration or when the throttle is decreased.
Automatic Transmission: Wide Open Throttle Shifting
The A/T WOT Shift Point table is used to calibrate the RPM at which the EMS sends the
command to perform the gear change when the throttle is held above a certain percentage. If
the Throttle percentage is higher than the A/T WOT On Above option, the EMS will ignore the
A/T Gear Desired maps and activate the shift solenoids at the RPM commanded in the A/T
WOT Shift Point table. Due to the mechanical and hydraulic response time of the transmission
it will not shift at the exact RPM that the EMS commands it to. It may be necessary to set the
shift point more than 1000 RPM lower than the desired max engine RPM, please be cautious
when adjusting the WOT Shift Point table.
Automatic Transmission: Line Pressure
The Options A/T LPress 1 Period - A/T LPress 3 Period are configured in the Startup
Calibration to be 98.44 ms and must not be changed. This frequency is increased by
hardware external to the main processor and output to the transmission solenoids at 300Hz.
The table below details how the three line pressure solenoids are controlled:
AEM EMS Option EMS Output Toyota Name Pin Function
A/T LPress 1 Valve PW1 Sol No5 12B Line Pressure
A/T LPress 2 Valve HS1 Sol No4 13B Gear Engagement Speed
A/T LPress 3 Valve PW3 Sol No3 14B Converter Lockup
Note that higher duty cycles will result in a lower line pressure and/or gear engagement speed.
Lower line pressure (high duty cycles in the LPress tables) generally translates into slower and
softer shifts and lower clutch/band holding force. Higher line pressure (low duty cycles in the
LPress tables) generally translates into quicker shift speeds and firmer shifts and higher
clutch/band holding force.
Automatic Transmission: Neutral Exit Retard
Even with the lowest possible line pressure, excess transmission shock or harshness may be
felt when moving the gear select lever to Drive or Reverse. To further decrease this shock, the
EMS can be configured to retard ignition timing when shifting into gear from Park or Neutral.
The options “AT N Rtd Max”, “AT N Rtd Step,” and “AT N Rtd Tme” can be used to adjust how
quickly timing is retarded, the maximum amount of timing retard, and the length of time the
ignition timing is retarded for. Note that A/T Shift Retard must be enabled if these settings are
to be used. The startup calibration for Automatic Transmission vehicles is configured to retard
the ignition when shifting out of Park or Neutral.
Traction Control
The factory Supra traction control is not supported with the AEM EMS. No removal of
components or other action is required from the end user.