Steven P. McNicoll wrote:

§ 91.175 Takeoff and landing under IFR.

(j) Limitation on procedure turns. In the case of a radar vector to a final
approach course or fix, a timed approach from a holding fix, or an approach
for which the procedure specifies "No PT," no pilot may make a procedure
turn unless cleared to do so by ATC.

Yes, of course. This is what says that you cannot do a PT in this
situation without ATC authorization (as I pointed out I understood
in my initial post). My question was whether a holding pattern
in lieu of a PT fell under the same rule. What caused my question
is that in the AIM (5-4-8, section b) the discussion splits limitations
on PTs and on holds in lieu of PTs:

1. In the case of a radar initial approach to a final approach fix or
position, or a timed approach from a holding fix, or where the procedure
specifies NoPT, no pilot may make a procedure turn unless, when final
approach clearance is received, the pilot so advises ATC and a clearance
is received to execute a procedure turn.

3. When a holding pattern replaces a procedure turn, the holding pattern
must be followed, except when RADAR VECTORING is provided or when NoPT
is shown on the approach course.

So that in section 1 above it says you may not do a PT if it says
NoPT, while in section 3 it says you must do a hold in lieu of a PT
unless it says NoPT. Under section 3 alone, it would seem possible
that a hold in lieu of a PT is permitted but not required if it
says NoPT. I write this just to explain why I was unsure. Everyone
here seems to agree that just like a PT, a hold in lieu of a PT
is not permitted if it says NoPT.

--
David Rind