Depending on the length of time the power was interrupted, your system may require GPS initialization.

If initialization is not necessary, the system proceeds directly to the Startup Confirmation screen.
If the system fails to locate a sufficient number of satellites to locate your position within 10 minutes, the following screen is displayed.

If you are experiencing GPS reception problems:
iPod®
...
Taking Care of the Unexpected
This section covers the more common problems that motorists experience with their
vehicles. It gives you information about how to safely evaluate the problem and
what to do to correct it. If the p ...
Breather Line and Suction Line Inspection (Page-1)
Special Tools Required
Fuel Pressure Gauge Attachment Set 07AAJ-S6MA150
Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially
available
Vacuum/Pressure Gauge, 0-4 inHg 07 ...