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Teach the ECU to the R/C System
Before the ECU can be used for the first time you must program the failsafe and learn the throttle stick and optionally
the auxiliary control positions of your R/C system.
To accomplish this, complete the following steps:
1. Connect one or both ECU servo cables to the receiver depending on either using single or two channel
operation. The “THR” cable connects to the throttle channel and if used, the “AUX” cable must be
connected to a channel capable of three (3) positions or a variable control. Make certain that all other
connections are made in accordance with the Electrical Connection Diagram.
Note: Even if you do not use the auxiliary channel for control, you can still plug the “AUX” cable into an
unused receiver channel for a redundant power signal connection. However, if this is done, you must
manually disable the auxiliary channel in the limits menu.
2. While pressing the Select Menu key on the GSU, switch on the receiver/engine.
Note: Instead of the Select Menu key on the GSU, the small button switch on the LED I/O board may be
pressed instead. This key can also be used to advance through the learn R/C sequence (described below).
This feature is useful when the GSU is not available. Keep in mind that the LED’s on the I/O board are the
same as the GSU for Standby, Pump running and OK.
Release Select Menu only after the three LED’s display the following blink sequence:
LED Blink Sequence
Standby/Man. Yellow
Pump running Red
OK Green ....
The GSU screen will display:
3. This procedure enables a system mode, whereby the ECU can learn the stick positions. When Select
Menu is released, only the green OK LED should illuminate. If the pulse width number is “:0 us” and the
green OK LED is flashing rapidly, then there is a problem with the receiver output. Test with a servo and
ensure the transmitter / receiver are working correctly. To test the connection, move the throttle stick
and the pulse width number should change. If not, the THR cable is not connected to the correct channel.
The GSU screen will display:
Throttle channel “Off” position
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