Haltech E6X Manual Win Version - Manual (Page 164)

E6X Manual
164
E.6.4 Nissan Triggers
The Nissan optical trigger sensor is used by almost every ECU controlled Nissan engine. It is
a cam sensor and consequently spins at half the engine speed, and is therefore able to measure
the full engine cycle position, so can be used as a trigger for direct fire and sequential
injection applications. The sensor consists of two signals, which will from now on be referred
to as home and trigger.
The home signal consists of 360 evenly spaced pulses, where each falling edge represents 2
degrees of engine movement.
The trigger signal consists of the same number of pulses as the engine has cylinders. The
beginnings of the pulses (rising edge) are evenly spaced, but the ends of the pulses (falling
edges) are not evenly spaced. The differing pulse widths enables the ECU to synchronise
engine position with ignition and fuel timing, the ECU does this by counting the number of
home pulses that occur during the trigger pulse.
Nissan Trigger Signal with Home Teeth = 4
Trigger Pulse
Home teeth