Electronic Spark Control Module: Description and Operation

Ignition (Hall) Control Unit:

PURPOSE AND LOCATION
The ignition (Hall) control unit functions as an electronic switch that opens and closes the coil primary ground connection to control the current in the ignition coil. This function is comparable to the operation of the points in a mechanical ignition system. The control unit is located beneath the instrument panel to the right of the glove compartment.

NOTE: Although the name "ignition (Hall) control unit" implies a component with processing abilities, this control unit has no such function. It is strictly a switching device.

OPERATION AND SIGNAL
When the Hall sender signal falls, the ignition (Hall) control unit permits the ignition coil to charge. When the signal goes high, the ignition (Hall) control unit interrupts the current in the ignition coil primary windings, inducing a high-tension pulse in the secondary windings. Since the ignition (Hall) control unit generates heat, the unit is mounted on a heat sink attached to the body for adequate cooling. A good contact between the unit and heat sink is necessary for reliable operation of the ignition (Hall) control unit.