Diamante Sedan V6-2972cc 3.0L DOHC (1993)
Ignition Relay: Description and Operation
Component Overview
Ignition Coil Power Transistor
Purpose
The power transistor controls ignition current by interrupting the ignition coil primary ground causing secondary circuit discharge.
Location
The power transistor is located on the intake manifold under the ignition coils.
Operation
The ECM controls ignition timing through the power transistor. The power transistor is a type of switch that allows a very low voltage (from the
ECM) to control a larger amount of voltage (negative side of coil).
It is actually three power transistors combined into one unit, controlling each circuit of the triple ignition coil. During engine cranking, the ignition
timing is fixed at 5°BTDC.
