it can show u
Timing Advance
Fuel System Status
Short Term Fuel Trim
Display current sensor data, including:
Fuel System status
Absolute Throttle Position
Clear trouble codes and turn off the MIL ("Check Engine" light)
Fuel Pressure
Air Flow Rate
Oxygen sensor voltages/associated short term fuel trims
Engine RPM
Coolant Temperature
Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database).
Long Term Fuel Trim
Intake Manifold Pressure
Intake Air Temperature
Vehicle Speed
Calculated Load Value
and much more also dyno test can be done