Scan Tool Operating Instructions - AK Automotive Training

EOBD
O2 Sensor Tests
EOBD has an optional mode for monitoring the oxygen sensor test results depending
on the method used by the vehicle manufacturer to comply with the requirement for
oxygen sensor monitoring. If the manufacturer does use this mode not all tests need
to be supported. The tester will display the supported tests and the data associated
with those tests e.g. Maximum sensor voltage for a test cycle (calculated).
View Freeze Frame
Freeze frame data is a snap-shot of live data that was stored in the control module at
the moment a Diagnostic Trouble Code was recognised. If a number of faults
occurred, then the freeze frame data stored is associated with the last fault to occur.
The DTC that generated the freeze frame data is also displayed in the data.
Non-Continuous
Some vehicle systems are not monitored continuously during normal running
conditions, e.g. catalysts and evaporative systems. These tests are manufacturer
specific, so while the results of the test will be shown, the meaning of the results
cannot.
Continuous Tests (Pending DTCs)
When the 'continuous monitor' detects a failure condition in an emission-related
powertrain component or system, only once in a drive cycle, it stores a 'Pending' code
in the control module's memory. If the continuous monitor detects the same failure
condition during the next drive cycle, it registers a DTC and illuminates the MIL.
System Control
Components on the vehicle may be turned on and off, or pulsed to test their operation.
These tests are manufacturer specific and are currently seldom supported in
controllers.
Vehicle Info
Information is displayed relating to the vehicle. This may be the VIN, controller version
numbers etc., but is not supported by all vehicles.
OBD Status
Indicates to the user whether or not the controller supports OBD requirements. Not all
vehicles support this.
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