There are no "passive abilities" in this game; they are basically just ability unlocks. Some unlocks (re stun grenades, weapon upgrades) happen to be abilities that cost munitions whereas some don't (re conscript repair kit, hull down).
If you really have a concrete idea of what "Passive Abilities" are I suggest you take some time to list them all and not a handful of "examples". And also explain why certain ones that might be construed as also being passive abilities does not fit your criteria. For my part, anything that's not off-map artillery or a unit being called in is a passive unlock, from OKW's Signal Relay to Ostheer's G43s to USF's Elite Vehicle Crews to Soviets' Ambush Gun Tactics.
Ok well what I mean Passive ability is the one that imidiatly has effect on gameplay without MP, Ammo or fuel invested
For example: Radio interception - you get insight on what your opponent is building.
you had more of passive abilities or abilities that costs nothing to activate in vanila CoH.
For example American Armor Company had - Fast deployment, Raid
Wermacht - Defense doctrine - For the fatherland, Advance warning, Fortifay the perimeter
Terror doctrine - Zeal
Panze Elite - Tank destroyer - Tank Awareness, APCR round, Double Infantry AT Efforts
Royal Commando Support - Ultra Decryption
I hope this clarify what I meant by passive ability.
BR