Engine Cranking Signal (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Highlander, Land Cruiser, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra & 4Runner)
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
While engine is cranking and voltage is applied to the starter, an input signal is also delivered to STA or NSW terminal of Engine Control Module (ECM). ECM may use input signal for determining ignition timing (spark advance) and for controlling fuel injection system.