ia EXHAUST EMISSION CONTROL Throttle Opener Control System (T.O.C.S.) Description 3 - The function of the throttle opener is to open the of unburned HC i; emitted. ' throttle valve of the carburetor slightly while the Carburetors equipped with the throttle opene vehicle is decelerating. During deceleration, the supply the engine with an adequate charge of Con manifold vacuum rises and the quantity of mixtLIre bustible mixture to maintain proper combustion in the engine is not sufficient for normal combus- during deceleration, resulting in a dramatic reduc tion to continue; consequently, a great amount tion in HC emissiont To intakl manifold Vacuum control valve From air cleaner Altitude norrecmr Primary throttle valve lrnmnl- opener SING diahragm Function check eonmctor G/n Speed rimming sit-lllch [Below to Inn/ii (6 MPH): 0N1 seczs OPERATION: . . Vehicle speed Transaxle Gear positron km/h (MPH) Solenoid TiO.C.S. operation Below 10 (6) ON Not operated Manual Any position Above 10 (6) OFF Operamd _ N" or "P ON Not operated Aummauc Any speed Others OFF Operated m; 11,; 1 so?