Federal

Digifant II Engine Management System:

The Digifant II TCI-h [1] ignition system ignites the air/fuel mixture in the combustion chamber to provide optimal performance, driveability and minimal emissions.
This system incorporates mechanical components for the distribution and electronic components to control the ignition timing.



OPERATION
As the distributor shaft turns, the shutter wheel (mounted to the shaft) induces a signal in the Hall-effect sender. The signal is sent to the Digifant II electronic control unit which uses various input devices to calculate the precise ignition timing signal. The timing signal is sent to the ignition (Hall) control unit which switches the coil primary circuit. This releases a precisely timed high voltage pulse, that flows through the coil wire to the distributor. The distributor rotor directs the voltage pulse, via the distributor cap, to the correct spark plug wire. At the spark plug it jumps a gap to reach engine ground. When the voltage pulse jumps the gap to ground, it creates a spark (ignition spark) strong enough to ignite the air/fuel mixture in the combustion chamber.

Ignition System And Components:

COMPONENTS OR SIGNALS
The Digifant II ignition system in this vehicle uses the following components or signals:

NOTE: Some ignition related components or signals may be covered in different sections. The correct section is indicated by "refer to ...."

^ Cap and static shield
^ Coil wire
^ Distributor
^ Ignition (Hall) control unit
^ Hall effect sender
^ Ignition coil
^ Digifant II electronic control unit
^ Rotor
^ Spark plug wires
^ Spark plugs



[1] BOSCH TCI-h stands for:
BOSCH = manufacturer
T = transistorized
C = coil
I = ignition
h = hall-effect sensor