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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.

The AEM ECU outputs a 21 byte sequence of data at 19200 baud. From this data, the following channels are extracted.

ECU Name Race Technology message Race Technology Default name Race Technology VAR number Resolution
Engine speed Engine RPM RPM VAR_0010 25 RPM
Engine Load pressure 5 Boost pressure VAR_3504 1 mBar
Throttle aux 1 Throttle position VAR_2000 0.1%
Air temp temperature 6 Inlet post intercooler 1 VAR_1005 0.1 oC
Coolant temp temperature 8 Water temp VAR_1007 0.1 oC
02-1 misc 1 Lambda 1 VAR_4000 0.01 lambda
02-2 misc 2 Lambda 2 VAR_4001 0.01 lambda
ADCR8 Analogue input 21 analog 21 VAR_0220 0.001V
ADCR11 Analogue input 22 analog 22 VAR_0221 0.001V
ADCR13 Analogue input 23 analog 23 VAR_0222 0.001V
ADCR14 Analogue input 24 analog 24 VAR_0223 0.001V
ADCR15 Analogue input 25 analog 25 VAR_0224 0.001V
ADCR16 Analogue input 26 analog 26 VAR_0225 0.001V
ADCR17 Analogue input 27 analog 27 VAR_0226 0.001V
ADCR18 Analogue input 28 analog 28 VAR_0227 0.001V

Note - Not all channels listed in the table(s) above may be available from your ECU. This can be dependent on the vehicle model & year of manufacture.

Page last modified on May 13, 2019, at 07:26 PM