•
The display should return to the default showing RPM and temperature. The
temperature should be 21 °C.
Setup failsafe mode and “Learn RC”.
The updated ECU has the unique ability to shut-off your engine if you have a radio
failure. This is accomplished by detecting that the signal from the receiver’s throttle
output is either missing or outside the values that were learned during setup.
YOU ARE REQUIRED TO USE THE FAILSAFE!
This will not instantly shut off the engine. A timer is started when the failsafe condition
occurs and the engine will immediately go to idle. After 3 seconds (2 seconds after
V5.0A for AMA requirements as of March 1, 2004) the engine will then shut off. This 2
second timer is reset back to zero anytime a non-failsafe condition is met. Your R/C
signal must be broken for at least 2 continuous seconds before the engine is shut off.
The following is for PCM receivers only. Users of FM (PPM) receivers bypass the
failsafe instructions and go to the
section in the manual. (FM Receivers
are not allowed under AMA rules.)
Setting the failsafe for JR PCM receivers – Call JetCat USA for failsafe setup
procedures for other radio brands.
If you look at the following servo travel graph, you can see how the ECU detects a
failsafe condition. The dark gray bar is the transmitters throttle channel for low throttle,
low throttle trim and full throttle set to 100% travel. This is the value that is set into the
transmitter’s failsafe. The light gray bar is a reduced low throttle, low throttle trim travel
and full throttle set to 75%. This is the value that will be taught into the ECU. If the
throttle input to the ECU is between 75% for low throttle, low throttle trim and 75% for
full throttle, then this would be within the normal range taught into the ECU and will
operate normally. If a failsafe condition exists, the transmitter’s pre-programmed 100%
low throttle, low throttle trim will be outputted by the receiver and this value would be
outside of the ECU’s taught in range. The ECU will now automatically set the engine to
idle (after the
FailSafe delay
) and start a programmable timer. The timer is set to 2
seconds by default. If the timer times out, the ECU will shut-off the engine. If at anytime
during this countdown the receivers signal is reacquired, the ECU timer will be reset and
the engine will go back to the speed the throttle stick is currently at.
Low
High
throttle
throttle
Failsafe 100% low / 100% high throttle travel.
ECU 75% low / 75% high throttle travel.
To accomplish this, you must execute the following steps. It is VITAL that these steps
be preformed in this order for the failsafe feature to operate properly! Review your
transmitter’s manual on how to set the failsafe. Examples are given for the JR 10X with
S style receivers.
YOU MUST PERFORM THESE STEPS!
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