When the ignition key is turned to the "START" position, current flows through the starter traction relay pull-in winding, moving the traction relay anchor. The traction relay anchor moves the drive lever (fork), which in turn engages the drive pinion (made together with the overrunning clutch) with the toothed ring of the variator or automatic transmission torque converter. At the same time, the movement of the traction relay anchor closes the "B" and "M" contacts of the starter.
As a result, current begins to flow through the armature windings, the starter and the holding winding of the traction relay, thereby turning on the starter electric motor. When the ignition key returns to the "ON" position after starting the engine, the overrunning clutch of the starter disengages the pinion gear from the toothed ring of the variator or automatic transmission torque converter.
Schematic diagram of the engine starting system.
(The original article is on the website MitsubishiMan)