APQP is a process which should be described- either by you saying that you are working according to the AIAG book or according to your own process
When Stijloor says it is not auditable this is correct as long as you do not say you work according to the handbook- then it is auditable.
As qusys says the APQP process is supposed to be a guide to the implementation of 7.1 and 7.3 in the standard.
You need to
audit your process , the Control Plan and the
FMEA are required outputs and as such only show this aspect of the process .
Check that your process does transform the required inputs- they are in the standard- into the required outputs- also in the standard.
Remember that if their are customer requirements, you must audit these as well.
e.g
Ford
Says the following
If you are a supplier to Ford- you must audit this.
Fiat
Says
These issues must be audited .
You must also show that your auditors have been trained on customer specific requirements.