Which ECS components must be inspected for a 1983 Toyota Tercel?

• A. PCV, TAC, AIS, EVP, OXY, CAT, EGR, SPK, CEM, 2bbl carb
• B. PCV, TAC, AIS
• C. EVP, OXY, CAT
• D. SPK, CEM, 2bbl carb

Answer: (A)

The test is asking you to identify all the components that make up the Emission Control System (ECS) on a 1983 Toyota Tercel. For that era, even a carbureted engine has a range of emissions-related parts that must be checked to ensure the system works as designed. The PCV system handles crankcase vapors, reducing evaporative emissions. The TAC (throttle/idle control) and AIS (air injection system) influence how the engine maintains proper combustion and exhaust treatment. The evaporative system, including the EVP (evap canister purge valve), controls fuel vapors from the tank and lines. The oxygen sensor (OXY) monitors exhaust gas composition to help balance the fuel-air mix. The catalytic converter (CAT) reduces pollutants, and the Exhaust Gas Recirculation (EGR) system lowers NOx by recirculating exhaust. Ignition-related components (SPK) and the Central Electronic Module (CEM) govern how and when the engine fires and how the emission controls are managed. Finally, if this particular vehicle uses a 2-barrel carburetor, that carburetor itself is part of the ECS because its operation directly affects emissions. Taken together, all of these parts are relevant to inspecting the ECS on that model and year, which is why the most complete answer includes every item listed.