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Pending Codes
These are codes whose setting conditions were met during the last drive cycle, but need
to be met on two or more consecutive drive cycles before the DTC actually sets. The
intended use of this service is to assist the service technician after a vehicle repair and
after clearing diagnostic information, by reporting test results after a driving cycle.
1) If a test failed during the driving 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.
2) 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
In most cases, the stored frame is the last-DTC that occurred. Certain DTCs, which 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.
Erase Codes
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 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 compliance to a state emissions
program. 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 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.
Live data can be displayed in various modes. See Live Data for detailed information.
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