FWIW.
The DM /N-59 module will NEVER bring up a single flash after the codes have been CLEARED until it goes through ALL emmissions self test.
Once all self test have been activated and PASS , then the DM will show a Single Flash.. and not until.
This is protection from guys clearing bad emmissions codes before DMV testings. It was there for the early Emmisions Inspections .
Unlike the other Diagnostic modules , which will immediately bring up a single flash after code clearing to simply notify the Tech that there are no present codes stored.
Disconnecting power to the DM defaults to code clearing and will result in the same , but that is not the design function of the Self Test of ECU/DM parameters.
Battery power interuption will clear codes, but it also clears management memory, so this is not advisable b/c the engine mangement learning mapping is reset to mean...................