Table 5-4 - Unit Communication Error Messages (Dual Gdu Installations); Table 5-5 - Gdu Reboot During Engine Start - Garmin G3X Touch Maintenance Manual

Table 5-4 – Unit Communication Error Messages (Dual GDU Installations)
Failure Message
GDU software version
mismatch
"[UNIT]" network address
changed"
"GDU COMM ERROR –
CHECK GDU WIRING"
[Navigation/Terrain/Obstacle]
Database Missing
[Navigation/Terrain/Obstacle]
Database Mismatch
5.3.5 GDU Reboot During Engine Start in a 14-volt Aircraft
If the GDU display inadvertently reboots during engine start, troubleshoot aircraft electrical system for
anything that might result in low bus voltage during engine start, reference Table 5-5 for recommended
actions.
NOTE
Flickering and dimming during engine start are not considered rebooting. The display has to turn
off and initialize again (generally requiring 20-30 seconds) to be considered a reboot.
Symptom
GDU display reboots
during engine start
(14-volt
aircraft only)
Maintenance Manual
G3X Touch EFIS Part 23 AML STC
Possible Cause
The two GDU displays are
using incompatible software
versions
State of a GDU's mode pins
was detected to have changed.
Indicates that more than one
GDU is configured to be the
same unit type (e.g. two
displays are configured as
PFD)
Indicates that a required
database is missing on the
specified GDU display.
Indicates that the GDU displays
have different versions of the
specified database.
Table 5-5 – GDU Reboot During Engine Start
Possible Cause Recommended Action
Low bus voltage Troubleshoot aircraft electrical system for:
 insufficient battery capacity
 poor starter performance
 insufficient wire gauge in starter circuit
 high resistance through wire connections, circuit
 other issues in the starter circuit and primary power
Page 36
Recommended Action
Update the GDU with incorrect software
version
Check for loose connections and
reference the G3X Touch EFIS Part 23
AML STC Installation Manual (190-
02472-01) for information on GDU
mode pin connections
Verify and correct GDU mode pin
connections per the G3X Touch EFIS
Part 23 AML STC Installation Manual
(190-02472-01)
Update databases as required.
Update the databases in all GDU
displays to the same cycle number.
breakers, or solenoids
distribution system
190-02472-02
Revision 2