Actually I have never tried those tests with key on engine off. I am surprised by the results and will verify them at the next opportunity. I use the 70% (federal) KOEO (key on engine off) stat, only to verify my test hook-up.
It would have been my concept that the code duty-cycle only came with the engine running. Need to see about this.
Bosch Master, ASE Master, L1
33 years MB technician