The Readiness Staus is a set of 8 bits, each of
which corresponds to one monitored emissions "system" in an
OBD-II car. When all readiness bits show "Passed", it means
that all systems have been checked and have passed the
on-board tests.
Whenever you clear DTC's or remove power from the ECU, all
readiness bits will be set to "Failed or Incomplete". Most
cars do not have all 8 systems, so as soon as you apply power
again, the bits corresponding to systems that are not actually
in the car will come up "Passed" again.
It takes a
variety of specific driving conditions to "test" all the
systems. It can be done in a short time using a very specific
and complicated procedure found in the On Board Diagnostic
section of the Factory Repair Manual for your engine. The
alternative is just to drive the car for 2-3 days. Make sure
you include at least one short highway trip, and your
Readiness Bits should all read "Pass" again.
Use
[Go Back]
to return to the Controller Information Screen.
VCDS-Lite
also Decodes Readiness bits into meaningful data on modern TDI
engines (a Ross-Tech exclusive, not even the
VAS-5051/5052 does this!):
Notes:
-
This
function is only available on Engine Controllers that are
OBD-II compliant (all 1996 and newer US-Model gasoline
engines).
-
Non-US
models and older TDI's may not support this function even
though they are otherwise OBD-II compliant. OBD-I did not
require any "monitors".
-
This
function may not work on 12V 2.8L V6 or 3.7L V8 engines
which have readiness bits stored in or near Measuring
Block Group 029.
