AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 209)

Page 209 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Data logging
All EMS systems feature two methods for data logging. One is called “PC Logging” where the
AEM Tuner software records data displayed on-screen directly to the PC memory. The other is
called “Internal Logging” and uses on-board logging memory within the ECU to store data. The
data logging setup is saved as part of the calibration file and must be configured properly to
work.
PC Logging
When AEMTuner is connected to an ECU, it can log the Channel data it is receiving from the
ECU into a PC Data-Log. The Channels that are displayed in any Channel Displays on the
current Display Sheet are the Channels that will be logged. If the user tries to close a Channels
Display, open a Channels Display, or change the current Display Sheet the system will alert the
user that they are PC Data-Logging, and request they either stop Logging and save the data, or
cancel the operation they are trying to do. When Logging is started the PC Data-Logging On
Icon will be activated in the Status Bar.
Left clicking on the drop down arrow shown above will display the following menu:
Pause/Resume PC Logging: PC Data-Logging may be paused, meaning that data from the
ECU is not recorded in the log, and the values in the Channels Displays are not updated.
Resuming causes both channel data to be recorded again, and the values in the Channels
Displays to be updated.
Cancel PC Logging: Cancelling a PC Log means that PC Data Logging is stopped, and the
data collected thus far is discarded and not saved to a file. AEMTuner remains connected to the
ECU when a PC Log is deleted.
Stop and Save: is used to stop and save the data logged to a file. After Logging is stopped the
ECU stays connected. When PC Data-Logging the logging rate is fixed at 50 hz.