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a) If a test failed during the drive cycle, the DTC associated with that test
is reported. If the pending fault does not occur again within 40 to 80
warm-up cycles, the fault is automatically cleared from memory.
b) Test results reported by this service do not necessarily indicate a
faulty component or system. If test results indicate another failure
after additional driving, then a DTC is set to indicate a faulty
component or system, and the MIL is illuminated.
Freeze Frame
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 values at the time the DTC is set.
Clear DTC
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.
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.
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. Select I/M Readiness to display a sub menu 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 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.
