The manual for the Garmin 430 lists a specific sequence of events for flying an ILS. It teaches us that it is OK to fly outbound from the IAF through the procedure with the GPS.
The manual reads: “Once established on the inbound approach course to the FAF, CDI coupling will automatically switch from the “GPS” to the “VLOC” receiver. (If the ILS frequency has been activated, as indicated in step #4.)”
Please confirm that the Garmin manual’s teaching is acceptable for a checkride.
The manual is correct and the technique is acceptable for a checkride. BTW, it is also acceptable to fly the Missed Approach using the GPS after executing the ILS. I'll see if I can find an additional reference to fall back on.