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// ACES help

How to Get an ACES Datalog CSV

EfiTracer reads the CSV datalog file your ACES system records. It does not need your tune file, calibration backup, or handheld screenshots.

01

Best path

Use the ACES Advanced Tuning Software

  1. 1 Connect the laptop to the ECU with the ACES USB-to-CAN cable.
  2. 2 Open the ACES Advanced Tuning Software and connect to the ECU.
  3. 3 Click Start Log before the event you want to capture.
  4. 4 Run the test: idle, cruise, tip-in, or a short pull only when it is safe.
  5. 5 Click Stop Log, then name and save the file as a .csv.
  6. 6 Upload the CSV to EfiTracer.
02

Alternate path

Capture a log with the handheld

ACES handhelds include a Logging menu for recording ECU data. Record the log there, save it, then use the handheld's Files area or USB connection to move the saved datalog to a computer or USB stick. The exact copy steps can vary by handheld and firmware version.

Shop note

If you can choose the file format, choose .csv. If the handheld gives you another file type, open it with the ACES software first and export a CSV before uploading.

What to capture

Warm-up

Coolant temperature rising while fuel loop is open and fuel learn is disabled.

Idle

A steady idle.

Steady cruise

A steady cruise.

Gradual acceleration

Throttle and manifold pressure rising together, short of wide-open throttle.

WOT Optional

A short wide-open throttle pull. Optional.

Problem event

The moment the problem happens. Mark it on the trace after you upload.

If the upload does not work

  • Wrong file type: EfiTracer needs the datalog CSV, not a tune file or calibration backup.
  • Missing channels: make sure the log includes RPM, MAP, Actual AFR, and Target AFR.
  • Too little data: capture the problem long enough for the report to judge it.
  • No ECU connection: check key-on power, the USB-to-CAN cable LEDs, drivers, and USB port.