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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
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 diagnostic trouble codes that may be set including freeze
frame data and readiness monitors.
Mode $05 – Displays oxygen sensor test results. This mode
displays the oxygen sensor monitor screen and the test results
gathered about the oxygen sensor.
There are ten numbers available for diagnostics:
1.
$01 Rich-to-Lean O2 sensor threshold voltage.
2.
$02 Lean-to-Rich O2 sensor threshold voltage.
3.
$03 Low sensor voltage threshold for switch time
measurement.
4.
$04 High sensor voltage threshold for switch time
measurement.
5.
$05 Rich-to-Lean switch time in ms.
6.
$06 Lean-to-Rich switch time in ms.
7.
$07 Minimum voltage for test.
8.
$08 Maximum voltage for test.
9.
$09 Time between voltage transitions in ms.
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 b a given vehicle maker if it's used.
Mode $07 – A request for DTCs (pending) from Continuously
Monitored Systems after a single driving cycle has been
8
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