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21
LAUNCH Professional 129X User Manual
EN
then the record starting time and ends with .x431 (To differentiate between les,
please congure the accurate system time). All diagnostic records can be viewed
by tapping “Data” -> “Diagnostic Record”.
5.3 OBDII Diagnosis
This option 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.
On the Job menu, press [OBD II] to enter system, the screen will automatically
navigate to the Monitor status screen.
Tap [OK], the following function list appears.
1. Read Codes
This option is used to identify which section of the emission control system has
malfunctioned.
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 off.
*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 sll 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
An important part of a vehicle’s OBD II system is the Readiness Monitors, which
are indicators used to find out if all of the emissions components have been
evaluated by the OBD II system. They are running periodic tests on specific
systems and components to ensure that they are performing within allowable
limits.
Currently, there are eleven OBD II Readiness Monitors (or I/M Monitors) dened
by the U.S. Environmental Protection Agency (EPA). Not all monitors are
supported in every vehicles and the exact number of monitors in any vehicle
depends on the motor vehicle manufacturer’s emissions control strategy.
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