• Read DTC (Diagnostic Trouble Codes)

This is a procedure that must be done when you tried to repair your car with check engine light on. It shows both of generic and manufacture’s specific codes, as well as brief descriptions. If your cell phone or laptop is connected to internet, you can get additional information of each code right away.

  • Clear DTC and Turn off MIL (Malfunction Indicator Light)

After your repair done or you want to make sure if there actually is a problem with your car, you need to erase or clear the codes and see if MIL won’t come back on. Depending on a problem you had, some codes come back in a minute, some codes come back after miles of drive. I recommend you need to drive at least 50 miles.

  • Display Freeze Frame Data

Freeze frame data is a set of readings of sensors when MIL comes on. These data help you figure out a problem greatly. Get the data several times, compare those, see what is in common. (ex. over 30 mph, coolant temp below 60, when a car is idling, etc)

  • Display Live Data

It is a current sensor’s data including:

  1. Engine RPM
  2. Calculated Load Value
  3. Coolant Temperature
  4. Fuel System Status
  5. Vehicle Speed
  6. Short Term Fuel Trim
  7. Long Term Fuel Trim
  8. Intake Manifold Pressure
  9. Timing Advance
  10. Intake Air Temperature
  11. Air Flow Rate
  12. Absolute Throttle Position
  13. Oxygen Sensor Voltages
  14. Fuel Pressure

These are only basic readings. Depending of software, it may display more readings.

  • Display I/M reading status tests

I/M stands for Inspection/Maintenance. The readiness of self test performed by OBD2 system is used by over 30 states to check for emission at the time of state inspection.

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