Engine Cranking Signal (All Models)
WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
To confirm whether the engine is cranking, the voltage applied to the starter motor when the engine is cranking is detected, and is input into terminal STA of the ECM as a control signal.