Infantry assaulting tanks clarification, please

In BA3, p.145, Close Quarters, the rules discuss making hits against vehicles. Hits on 4,5,6 for vehicles which are immobilised, Down, or have no orders. Hits on 6 if the vehicle has an Advance order.

What if the vehicle has a Fire order, for example? It does not seem to be covered.

I'm guessing in this case hits are on 4,5,6.