23
Lycoming, Jabiru and Rotax fuel pump covers
END OF FUEL INSTALLATION PART
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General system information
EM-5 Reset
Any time that the power is shut off or interrupted to the EM-5, or if interference prevents the software
from executing properly, the EM-5 will automatically perform a reset. This takes about 0.5 seconds
and the engine will falter during that period. When this happens, the SDS EFI startup screen will
appear in the LCD window. Reset can also be caused by the switching of high current devices such
as electric pumps, motors or solenoids. These devices cause high voltage spikes that are difficult to
filter. Filtering can sometimes be successful if a rectifier diode is placed across the offending solenoid,
motor etc. The striped end (cathode) of the diode should connect to the (+) terminal and the other side
of the diode to the (-) terminal. Never attempt to fly the aircraft if your ECU is resetting on the
ground! This indicates there is a serious issue. Find it and fix it before flying!
Shutting off Power and Memory
Programmed values are stored in the EM-5 microprocessor in EEPROM memory, which holds the
values in memory when power is turned off, needing no battery power. As soon as you change a
value with the programmer, it is permanently changed and stored in EEPROM memory.
Disconnecting the aircraft battery will have no effect on the SDS system.
Disconnecting the LCD Programmer
Set the VALUES LOCK to the ON position before disconnecting the programmer. No data will be lost.
Data is stored in the EM-5.
Injector Drivers
Injector drive transistors may be triggered in ones, pairs, threes or fours depending on application.
Four cylinder aircraft ECUs fire the injectors in ones as of Jan. 31/16 to allow for individual cylinder
fuel trimming.
Air Temperature (AT)
The air temperature correction map is pre-programmed when delivered, and is not normally user
accessible. It provides an absolute density correction relating to cues from the air temperature sensor.
AT is displayed in GAUGE mode.
Mixture Knob (KNOB)
The mixture knob controls the overall mixture across all ranges. In effect, it adds or subtracts a
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