Engine Indication Troubleshooting - Garmin G3X Installation Manual

If the Airspeed and/or Altitude is failed and shows a Red-X condition as shown in Figure 33-2:
Figure 33-2 Airspeed and Altitude Failure Indications
1. Inspect ADAHRS pitot/static plumbing integrity.
2. Inspect pitot/static ports and associated equipment.
3. If the problem persists replace the ADAHRS with a known good unit.

33.5 Engine Indication Troubleshooting

To troubleshoot an Engine Indication failure (Figure 33-3), gather answers to the following questions.
This information may be helpful to the installer/pilot, the G3X Dealer, or to Garmin Aviation Product
Support in troubleshooting the failure.
Figure 33-3 Engine/Airframe Failure Indications (Reversionary or Split-Screen PFD)
1. Does cycling power restore operation?
2. Did the operator give it sufficient time to start and initialize?
3. Did the problem begin after a software or configuration load?
4. Did the problem happen on the ground or while airborne?
5. Is only the EGT/CHT (i.e. thermocouple inputs) Red-X'd? If so, the GSU 73 configuration
module, configuration module wiring, thermocouple reference, or applicable thermocouple is
defective. Check the wiring and replace the configuration module or applicable thermocouple.
6. Are there one or more temperatures that drop as the electrical load increases? If a temperature
probe shorts (usually where the bayonet is crimped) a ground loop is created forcing the reference
(low side) to increase which causes the temperature reading to decrease.
7. Does the EGT temperature slowly drift up and eventually flag? This is an indication of an
(electrical) open in the temperature probe or wiring.
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G3X/G3X Touch Installation Manual - Troubleshooting
Page 33-4