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15
19
OBDII Function
OBD2 Test
[1]
Read Current Trouble Code
[2]
Clear Trouble Code
[3]
Read Current Data
[4]
Read Pending Trouble Code
[5]
Read Freeze Frame Data
[6]
Readiness Tests
[7]
Oxygen Sensor Test
[8]
Read System Information
This section describes the various functions of each diagnostic option:
1. Stored codes are the current emission-related DTCs from the ECM of the vehicle. OBD II/EOBD Codes
have a priority according to their emission severity, with higher priority codes overwriting lower priority
codes. The priority of the code determines the illumination of the MIL and the codes erase procedure.
Manufacturers rank codes differently, so expect to see differences betweenmakes.
2.This option is used to clear all emission-related diagnostic data such as, DTCs, Freeze frame data and
manufacturer-specific enhanced data from the vehicle’s ECM, and reset the I/M Readiness Monitor Status
for all vehicle’s ECM. A confirmation screen displays when the clear codes option is selected to prevent
accidental loss of data. Select Yes to continue or No to exit.
3.This function displays the real time PID data from ECU. Displayed data includes analog inputs and
outputs, digital inputs and outputs, and system status information broadcast on the vehicle data stream.
4. These are codes that were generated during the last drive cycle, but before the DTC actually sets, two
or more consecutive drive cycles are needed. The intended use of this service is to assist the service
technician after a vehicle repair and after clearing diagnostic information, by expect or see differences
between makes.
5. Typically, the stored frame is the last DTC that occurred. Certain DTCs that have a greater impact on
vehicle emission, have a higher priority. In these cases, the top prioritized DTC is the one for which the
freeze frame records are retained. Freeze frame data includes a “snapshot” of critical parameter value at
the time the DTC is set.
6. This function is used to check the readiness of the monitoring system. It is an excellent function to use
prior to having a vehicle inspected for state emissions compliance. Select I/M readiness to display a sub
menu with two choice.
7. Use this option to view the result of On-Board Monitor tests. The tests are useful after servicing or
after erasing a vehicle’s control module memory.
8. The option displays the vehicle identification number (VIN), the calibration identification, and the
calibration verification number (VIN), and other information of the test vehicle.
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