You would have to continue paying your secured loan as normal. It can't be included in an IVA
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk
The secured loan is actually included within the IVA, but only with regard to any element which is deemed to be unsecured - ie not covered by the value of the asset securing the debt.
As Jan says, you will need to continue to make the secured loan payments in order to avoid the asset being repossessed.