8
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 - Oxygen Sensor Test Results. This mode displays the
oxygen sensor monitor screen and the test results gathered about the
oxygen sensor.
There are nine 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 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 a problem. This is used by service technicians to verify
repair was performed properly and after clearing diagnostic trouble codes.
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.
