1.Read diagnostic trouble codes, both generic and manufacturer specific.
2.Clear trouble codes and turn off the MIL ("Check Engine" light).
3.Display current sensor data, including.
4.Engine RPM.
5.Calculated Load Value.
6.Coolant Temperature.
7.Fuel System Status.
8.Vehicle Speed.
9.Short Term Fuel Trim.
10.Long Term Fuel Trim.
11.Intake Manifold Pressure.
12.Timing Advance.
13.Intake Air Temperature.
14.Air Flow Rate.
15.Absolute Throttle Position.
16.Oxygen sensor voltages/associated short term fuel trims.
17.Fuel Pressure.