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4.3 OBD II Diagnosis
This function presents a quick way to check for DTCs, isolate the cause of the
illuminated Malfunction Indicator Lamp (MIL), check monitor status prior to
emissions certification testing, verify repairs, and perform a number of other
services that are emission-related.
After the tool is properly connected to the vehicle’s DLC, tap “OBD II” in the
Job Menu. The tool will automatically start a check of the vehicle’s computer
to determine which type of communication protocol it is using, then display the
Monitor Status.
Tap “OK”, the following function list appears.
1. Read Codes
This function can identify which section of the emission control system has
malfunctioned.
2. Erase Codes
This function erases the codes from the vehicle, after retrieving codes from the
vehicle and certain repairs have been carried out.
Make sure the vehicle’s ignition key is in the ON position with the engine off
before the operation.
3. I/M Readiness
This function checks whether or not the various emissions-related systems on
the vehicle are operating properly, and are ready for Inspection and Maintenance
testing.
It can also be used to check the Monitor Run Status, and to conrm if the repair
of a car fault has been performed correctly.
4. Data Stream
This function retrieves and displays live data and parameters from the vehicle’s
ECU.
5. View Freeze Frame
This function takes the snapshot of the operating conditions when an emission-
related fault occurs.
*Note: If DTCs were erased, Freeze Data may not be stored in vehicle memory
depending on vehicle.
6. O2 sensor test
This function retrieves O2 sensor monitor test results of the most recently
completed tests from the vehicle’s on-board computer.
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