Pickup 4WD L4-2559cc 2.6L SOHC (4ZE1) (1988)
Power Transistor: Description and Operation
Ignition Coil And Power Transistor
The power transistor, in-line between the ignition coil and ECM, is the switch that triggers the coil. By calculating various inputs, the ECM controls
ignition timing through its control of the power transistor. The ECM considers input from the crank angle sensor, throttle valve switch, coolant
temperature sensor, air flow sensor and vehicle speed sensor when calculating ignition timing.