About what the title says. Servo cycles, but no flashes from the TCU lights. Checked the continuity of the wires (they go to a terminal strip on the firewall) and they're fine, as are the bulbs.
Thoughts?
TIA
About what the title says. Servo cycles, but no flashes from the TCU lights. Checked the continuity of the wires (they go to a terminal strip on the firewall) and they're fine, as are the bulbs.
Thoughts?
TIA
Re: 914 first powerup- no TCU caution or warning lights
by Rotax-Owner » 3 weeks ago
If the servo cycles at power-up, the TCU is powered and functioning, that’s the “built-in self-check”
The TCU does not power the caution or warning lights; it only switches them to ground. The lamps must have aircraft +12 V on one side. If neither light comes on (even briefly), it’s almost always a lamp power, ground reference, or pinning issue, not a bad TCU.
Common on first installs:
Quick test: With the master on, momentarily ground the lamp wire; if it lights, the issue is with the wiring to the TCU.
Servo cycles = TCU is alive.
I have attached a document titled "Understanding the Rotax 914," and here is the link for you to download the 914 installation manual.
https://www.rotax-owner.com/en/support-topmenu/engine-manuals#current-engines
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