User guide

AutoEnginuity ScanTool User Guide 19
If the MIL is cleared on the connected vehicle and the problem
isn’t fixed, the MIL will return. If there is a serious problem with
the connected vehicle, more problems could arise, or the problem
could worsen, if the appropriate action is not taken. It is not enough
to clear the MIL, the fault that caused the MIL must be addressed.
Even after the MIL is cleared, any DTCs will be stored in the
engine computer’s memory banks for forty warm-up periods;
eighty warm-up periods in the case of Misfire or Fuel System Mon-
itoring.
Since MIL Activated/Cleared
Some vehicle computers will report the time since, the number
warm-ups, and the distance travelled since the MIL was actived.
Conversely, if the MIL was cleared, the time since, the number of
warm-ups, and distance travelled since that was done will be
reported if that is the case. This information is reported by the
ScanTool underneath the Check Engine graphic.
Freeze Frame Data
Freeze Frame data is a snapshot of the vehicle’s state when the
fault occurred. If a vehicle reports a freeze frame snapshot, all of
the data is from the vehicle components; not default values. Freeze
frame data gives you great insight to the load and state the vehicle
was operating under when the fault occurred. Don’t overlook this
information when determining whether a fault occurred because of
a faulty component, when it could have been excessive strain on the
vehicle. Not all freeze frame sensors are supported by all vehicles.
Only one DTC can cause freeze frame data to be stored at a
time. The DTC that caused the MIL to activate will typically be the
one to store the freeze frame data. A manufacturer can determine
which DTC should store the freeze frame data based on severity.