AEM Universal EMS (30-1900U) pinout and specs

Checked against the maker's documents 27 September 2026

AEM Universal EMS (30-1900U) is a 95-pin wire-in AEM ECU on 1 connector: C (95 pins).

It has 10 injector outputs and 5 ignition outputs. The injector drivers are peak-and-hold, so low-impedance injectors run without a resistor pack. The ignition outputs drive dumb coils directly and will not trigger smart coils.

There are 2 dedicated trigger inputs, each happy with a VR or a Hall sensor. Two knock inputs cover both banks of a V engine. It has 2 onboard wideband controllers, so a sensor wires straight in.

It does not drive an electronic throttle, so plan on a cable throttle. There is no CAN bus, which rules out CAN dashes and CAN expansion. Four outputs can switch 12V as well as ground.

Spec sheet

Which builds it suits

Of the 58 swap presets in the planner, 0 fit as they are and 0 fit with add-ons; 58 do not fit at all. Where it falls short, it is usually not enough ignition outputs. The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.

It can't run the GM LT1 (Gen5 6.2 alum): not enough ignition outputs. It can't run the Nissan VR38DETT (R35 GT-R): not enough ignition outputs. It can't run the BMW N54 (3.0 twin-turbo I6): not enough ignition outputs.

Plan a build around the AEM Universal EMS (30-1900U)

Pin table

Connector C carries 10 injector outputs, 5 ignition outputs and 2 trigger inputs.

Other AEM ECUs

The closest AEM unit is the AEM Infinity Series 3. Against it, this one has 5 ignition outputs (the Infinity Series 3 has 9), 2 wideband controllers (the Infinity Series 3 has 0), 0 CAN buses (the Infinity Series 3 has 1) and 95 pins (the Infinity Series 3 has 73).

• AEM Infinity Series 3
• AEM Infinity Series 5
• AEM Infinity Series 7
• AEM EMS-4

Source: AEM document AEM-Manual-UEMS-30-1900U

Always verify against the manufacturer's manual and your tuner before wiring.