Indeed- the CPS is there to correctly time the sequential mode injection.
With no signal present, the ECU will run in batch fire mode where all
injectors operate together- twice per engine revolution.
In sequential mode injectors fire singlely just before the induction stroke
on each cylinder upto 4500rpm and / or 80% throttle.
After this they switch to dual sequential and fire twice per stroke per
cylinder, once on the exhaust stroke, and once just as the intake valve
opens and draws air / fuel into the cylinder. This is mainly to ensure
enough fuel is present to meet demand.
(this is correct for most Ford EEC5 ecu's.)
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