Haltech E6X Manual Win Version - Manual (Page 137)

E6X Manual
137
Some trigger devices have uneven pulse widths to indicate the position of a specific cylinder
(often cylinder 1). If rising edges were used as the trigger edge then there would be a
variation of 20° between the trigger for cylinder 1 and all other cylinders. This would lead to
cylinder 1 being 20° more advanced than all the other cylinders. To ensure even ignition
timing the trigger edge would be the falling edge and the trigger angle would be 60° BTDC.
As describe above, Hall effect triggers produce a signal that is made up of transitions or edges
and these edges correspond to a specific angle and as a result the ECU need to be configured
to trigger on a specific edge. As illustrated earlier, reluctor triggers produce a different signal
trace and the ECU uses signal conditioning to produce the square wave signal required by the
processor. When a reluctor trigger is being used, the Trigger and Home edge should be set to
Rising edge triggered, unless trigger edge problems occur.
The common symptoms for trigger edge problems are a sudden jump in ignition timing angle,
of usually one reluctor tooth value.
Ie, with a 24 tooth reluctor cam sensor, one tooth value = (720 deg / 24 teeth) = 30 crankshaft
deg. If this problem occurs, try changing the edges of the Home signal. Please make sure you
check the base timing of the engine after this change is made.