OBDII /CAN SCAN TOOL
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Diagnostic Test Modes
Diagnostic Test Modes as described in the latest OBD II standard SAE J1979.
Note: Not all Modes are supported by all vehicles.
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 $01 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 more than one
response message if there are more
trouble codes than will fit in the data bytes
of the response message, or if there are
more than one ECU computer responding.
Mode $04 –Used to clear DTCs and
Freeze Frame Data. This clears all DTCs
that may be set including freeze frame
data and Readiness Monitors.
Mode $05 –Oxygen Sensor Test Results.
This mode displays the oxygen sensor
monitor screen and the test results
gathered about the oxygen sensor.
Mode $06 –Non-Continuously Monitored
Systems test results. There are typically a
minimum value, a maximum value, and a
current value for each non-continuous
monitor. This data is optional, and it is
defined by a given vehicle maker if it's used.
Mode $07 –Request for DTCs (pending)
from Continuously Monitored Systems
after a single driving cycle has been
performed to determine if repair has fixed
aproblem. This is used by service
technicians to verify repair was performed
properly and after clearing DTCs.
Mode $08 –This special Control Mode
requests control of the on-board system,
test, or component bi-directionally (where
applicable). This mode is manufacturer
specific.
Mode $09 –Reports vehicle information.
This information includes vehicle VIN number
and calibration information stored in the
vehicle ECUs.
Mode $0A –Request Emission-Related
Diagnostic Trouble Codes with Permanent
Status. This mode is required for all
emissions-related DTCs. The presence of
permanent DTCs at an inspection without the
MIL illuminated is an indication that a proper
repair was not verified by the on-board
monitoring system.
