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36
LAUNCH Professional 919E User Manual
2. Erase Codes
After reading the retrieved codes from the vehicle and certain repairs have
been carried out, you can use this function to erase the codes from the
vehicle. Before performing this function, please be sure the vehicle’s ignition
key is in the ON position with the engine o.
Notes:
• Before performing this function, make sure to retrieve and record the trouble
codes.
• After clearing, you should retrieve trouble codes once more or turn ignition
on and retrieve codes again. If there are still some trouble codes in the system,
please troubleshoot the code using a factory diagnosis guide, then clear the code
and recheck.
3. I/M Readiness
I/M refers to Inspection and Maintenance that is legislated by the Government
to meet federal clean-air standards. I/M Readiness indicates whether or not
the various emissions-related systems on the vehicle are operating properly
and are ready for Inspection and Maintenance testing.
The purpose of the I/M Readiness Monitor Status is to indicate which of the
vehicle’s Monitors have run and completed their diagnosis and testing (as
described in Chapter 2.5), and which ones have not yet run and completed
testing and diagnosis of their designated sections of the vehicle’s emissions
system.
The I/M Readiness Monitor Status function also can be used (after repair of
a fault has been performed) to confirm that the repair has been performed
correctly, and/or to check for Monitor Run Status.
4. Data Stream
This option retrieves and displays live data and parameters from the vehicle’s
ECU.
5. View Freeze Frame
When an emission-related fault occurs, certain vehicle conditions are recorded
by the on-board computer. This information is referred to as freeze frame
data. Freeze Data is a snapshot of the operating conditions at the time of an
emission-related fault.
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