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AEM EMS-4 Standalone Engine Management System

AEM EMS-4 Standalone Engine Management System. AEM EMS-4 is full programmable standalone engine management system for producing maximum power and reliability. Combine your AEM EMS-4 with a Boomslang Plug N Play Harness to avoid wire splicing
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AEM EMS-4 Standalone Engine Management System

Scion Models


AEM’s EMS-4 Universal Standalone Programmable Engine Management System is the ideal standalone Engine Management System for modified Powersports and four-cylinder race car applications. The EMS-4 was created using AEM's powerful Series 2 hardware and includes all of its advanced features without the unneeded ancillary components.

If you have modified your four-cylinder Powersports application beyond the factory ECU’s ability to control engine operation, or have a 4-cylinder race vehicle that does not require some of the advanced hardware features of an AEM Series 2 Plug & Play System, AEM’s EMS-4 provides complete engine control for the maximum power and reliability.

AEM’s EMS-4 provides complete engine control for small engines with up to 4 cylinders. The unit includes a 36-pin connetor that is specifically designed to operate in harsh environments. It is completely sealed and weather/shock proof, allowing it to be mounted anywhere. The EMS-4 works with MAG or HALL crank inputs and can directly drive smart coils or an external ignitor such as AEM’s 4-Channel Coil Driver (part # 30-2840).

Weather/Shock Proof Enclosure 36-Pin Connector specifically designed to operate in harsh environments

Injector/ Coil Outputs
Injector Outputs (8 ohm minimum, High Impedance Only)4 Saturated
Coil Triggers 0-5V Falling Edge Fire (Do not connect to coil primary)4
Timing Sensor Inputs
VR (Mag) Cam Input1
VR (Mag) Crank Input1
Hall VSS Input1
Hall Crank Input1
Hall Cam Input1
GPIO - 1.5A Low Side Output / 0-5V Analog Input / Switch Input4
GPIO - 1.5A Low Side Output / 0-5V Analog Input / PWM Output4
O2 Sensor Input 0-5V Analog1
Knock Sensor Input Programmable1
Throttle Position Sensor Input 0-5V1
Manifold Pressure Sensor Input 0-5V1
Coolant Temperature Sensor Input 0-5V1
Inlet Air Temperature Sensor Input 0-5V1
Sensor Ground1
5 Volt Reference1
USB commsYes
Communication cables includedYes
Fully enabled editing/logging software includedYes
CAN bus equipped with Programmable Send / ReceiveYes
CAN data stream output32 ch
DATA Acquisition
Internal data logging8 MB
Maximum internal logging rate (per channel)125 Hz
PC loggingYes
Data analysis using AEMLogYes
Functions and Features
User adjustable knock sensor center frequencyYes
Individual cylinder ignition trimsYes
Individual cylinder fuel trimsYes
High/Low speed fuel pump supportYes
All channels/maps/tuning options unlockedYes
Boost controlYes
Groundspeed based boost targetYes
Nitrous injectionYes
Staged injectionYes
Ground speed limitingYes
Rate of Acceleration ControlYes
Overrun boost enhancement (anti-lag)Yes
Gear change ignition cut (shift-without-lift)Yes
Password protected calibrationsYes
Fuel & Ignition rev limitersYes
"In cockpit" global fuel trim capabilityYes
Gear dependent shift lightYes
Evap/Purge functionYes
Software definable "virtual" switch inputsYes
EGT Based fuel trims (additional hardware needed)Yes
Maximum boost limitNone
Physical Dimensions
Length120 mm
Width114 mm
Height35 mm

AEM’s EMS-4 Universal Programmable Engine Management System is legal in California only for racing vehicles which may never be used upon a highway.

Use this system with EXTREME caution! The AEM EMS System allows for total flexibility in engine tuning, however misuse of this product can lead to major engine/vehicle damage. If you are not well versed in engine dynamics and the tuning of management systems or are not PC literate, please do not attempt installation/tuning of this product. For technical assistance, please visit our forum or visit our dealer locator for a Factory Trained tuner near you. AEM holds no responsibility for any engine damage that results from the misuse of this product!

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