Users Manual Part 1

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retained. Freeze frame data includes a “snapshot” of critical parameter values at
the time the DTC is stored.
 Erase Codes
This option is used to clear all emission-related diagnostic data including DTCs,
freeze frame data and specific manufacturer-enhanced data from the vehicle ECM.
This option resets the I/M Readiness Monitor Status for all vehicle monitors to Not
Ready or Not Complete status.
A confirmation screen displays when the clear codes option is selected to prevent
accidental loss of data. Select Yes on the confirmation screen to continue, or No to
exit.
I/M Readiness
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.
Selecting I/M Readiness opens a submenu with two choices:
 Since DTCs Cleared – displays the status of monitors since the last time the DTCs
are erased.
 This Driving Cycle – displays the status of monitors since the beginning of the
current drive cycle.
Live Data
This function enables the display of real-time PID data from the ECU. Displayed data
includes analog and digital input and output, and system status information broadcast
in the vehicle data stream.
Live data can be displayed in various modes, see 4.5 Live Data on page 43 for detailed
information.
O2 Sensor Monitor
This function allows retrieval and review of recent O2 sensor monitor test results stored
on the vehicle’s on-board computer.
The O2 Sensor Monitor test function is not supported by vehicles that communicate
using a controller area network (CAN). For O2 Sensor Monitor tests results of
CAN-equipped vehicles, refer to On-Board Monitor.
On-Board Monitor
This function allows you to view the results of On-Board Monitor tests. The tests are
useful after the service when a vehicle’s control module memory is already erased.