D.2.d. Full Sequential Injection
The biggest difference between full sequential injection and other injection types is that full
sequential injection requires the use of a cam trigger in addition to the crank trigger. The cam trigger is
used to provide a reference pulse for Top Dead Center compression. The crankshaft trigger knows the
location of TDC, but on a 4-stroke engine, TDC is not all that is needed to determine which cycle the
engine is on. For this, a camshaft reference is needed. With a full sequential setup, each injector channel is
independent, and each injector is fired once per engine cycle (every two revolutions on a four stroke) on the
end of the exhaust stroke. Rotary and 2-stroke applications are inherently full sequential without the need
for a cam reference, since their engine cycles occur in only one revolution. Consequently, rotaries and 2-
strokes will inject fuel on every TDC event.
Figure D.2. 3:
6-cylinder full-sequential injection wiring for a 1-6-2-4-3-5 firing order.
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TECgt Manual Version 2.0
- Page 55 -
©2008 Electromotive, Inc.
