D21 Hardbody 2WD V6-2960cc 3.0L SOHC MFI (VG30E) (1991)
Power Transistor: Description and Operation
Power Transistor
The power transistor, located on the R.H. side of the intake plenum, is a low current switch. It allows the signal sent from the ECU (very low
current) to activate the primary circuit in the ignition coil (much higher current). This induces high voltage in the secondary windings of the
ignition coil, providing spark to the distributor cap and plugs.