3
2.1.2
OBDII Modes of Operation
Below is a brief description of OBDII 10 modes.
Mode $01
– Identifies the Powertrain information and shows
current data available to the scan tool. This data includes: DTC set,
status of on-board tests, and vehicle data such as engine RPM,
temperatures, ignition advance, speed, air flow rates, and closed
loop status for fuel system.
Mode $02
– Displays Freeze Frame data. Same data as in mode 1,
but it was captured and stored when a malfunction occurred and a
DTC was set. Some of the PIDs for mode one are not implemented
in this mode.
Mode $03
– Displays the type of powertrain or emission related
DTCs stored by a 5 digit code identifying the faults. There may be
