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  • AEM Series 1 EMS

This protocol works with all AEM ECUs except the #30-6905 EMS-4 which does not have a serial port. For series 2 EMS systems or for the #30-6905 EMS-4 you can use the AEM CAN interface.


  • ECU configuration not required.


This ECU should be connected via serial / RS232 connections:

  • The Race Technology ECU Interface will connect directly to the AEM ECU. Connect the ECU connector from the interface into the ECU communications port.

Data Channel Listing

  • The AEM ECU outputs a 21 byte sequence of data at 19200 baud. From this data, the following channels are extracted:
ECU Message Name Race Technology Data Channel Resolution of Data
Engine speed RPM (Engine RPM) 25 RPM
ADCR8 Analog 21 (analogue input 21) 0.001V
ADCR11 Analog 22 (analogue input 22) 0.001V
ADCR13 Analog 23 (analogue input 23) 0.001V
ADCR14 Analog 24 (analogue input 24) 0.001V
ADCR15 Analog 25 (analogue input 25) 0.001V
ADCR16 Analog 26 (analogue input 26) 0.001V
ADCR17 Analog 27 (analogue input 27) 0.001V
ADCR18 Analog 28 (analogue input 28) 0.001V
Engine Load Boost pressure (pressure 5) 1 mBar
Air temp Inlet post intercooler 1 (temperature 6) 0.1 oC
Coolant temp Coolant temp (temperature 8) 0.1 oC
Throttle Throttle position (aux 1) 0.1%
02-1 Lambda 1 (misc 1) 0.01 lambda
02-2 Lambda 2 (misc 2) 0.01 lambda

Not all channels listed in the table above may be available from your ECU. The available data channels vary with the vehicle model, year of manufacture & connected sensors.

Page last modified on August 19, 2020, at 12:04 PM