Expo LRV AWD L4-1834cc 1.8L SOHC 16 Valve (1992)
Ignition Control Module: Description and Operation
Ignition Coil And Power Transistor Circuit
PURPOSE
The power transistor controls ignition current by interrupting the ignition coil primary ground causing secondary circuit discharge.
LOCATION
The power transistor is located in the distributor.
OPERATION
The ECU controls ignition timing through the power transistor. The power transistor is a switch that allows a very low voltage (from the ECU) to control
a larger amount of voltage (negative side of coil). During engine cranking, the ignition timing is fixed at 5°BTDC
