Haltech E6GMX - Manual (Page 106)

E6GMX Manual
106
APPENDIX E TRIGGER INTERFACE
Trigger Interface
The ECU is only capable of accepting the Standard Hall effect trigger pattern found on GM
vehicles.
The following fields configure the trigger input:
Trigger Edge
Trigger Angle
Trigger Pull-up
The trigger interface will be described below in terms of the above fields to simplify
configuration of the ECU trigger interface.
E.1 Trigger Edge
The ECU uses the signal transitions from low to high called rising edges and high to low
called falling edges to determine engine position, these transitions occur at specific angles
across the rotation of the crank (half cycle) or cam (full cycle). In most instances the ECU
will only uses one type of transition (rising or falling) for a trigger and this is known as the
Trigger Edge.
In the example shown below the trigger occurs on a rising edge at 70° BTDC. The second
edge, a falling edge, could occur any time after the rising edge, in some installations the
second transition will coincide with 10° BTDC or TDC. This second edge will have no effect
Falling Edge
Rising Edge