Haltech E6X Manual DOS Version - Manual (Page 106)

E6X Manual
106
cylinders opposite in the firing order. A 6-cylinder engine with firing order 1-5-3-6-2-4
would have the following injector pairs:
INJ1 cyl 1 and cyl 6
INJ2 cyl 5 and cyl 2
INJ3 cyl 3 and cyl 4
This fuel scheme requires a home signal that is driven by the crank or cam since the ECU
needs to know what the engine position is in its 360° cycle.
Note:
Sequential injection on 5 and 10 cylinder motors is not possible with the E6X.
The ECU has no means of programming the firing order of the engine in
software. It uses the channels sequenced in the order mentioned previously.
Therefore, it is necessary to wire the injectors according to the firing order.
B.4 Synchronising
When the ECU is configured to operate an engine that uses direct fire ignition or sequential
injection, the ECU needs a reference for engine position often referred to as a “synchronising”
signal or a “home” signal.
When the ECU is configured to perform full sequential injection or full direct fire ignition it
requires a home signal that occurs once in the full cycle (720° of crank rotation and 360° of
cam rotation). If the ECU is configured for waste spark direct fire the ECU requires a home
signal that occurs once in the half cycle (360° of crank rotation).
On a distributed engine the ECU does not need to know the engine position, it simply
generates a spark that is mechanically distributed to the correct cylinder. Direct Fire ignition
systems need to know which cylinder to fire next. The same principles of timing and
sequence apply to sequential injection. When the ECU sees a home signal it assumes that the
cycle for ignition and injection has restarted.