1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 64Get this manual
3-9 ENGINE CONTROL SYSTEM CTP (Closed Throttle Position) SWITCH The CTP switch is installed on the top of throttle body and used to detect whether the throttle is fully closed or notThis switch inputs the signal to the ECMThe ECM detects the throttle position and determines the control modes for various control system (idle air control, ignition timing control, etc