1986 Suzuki Samurai EVAP System Schematic - ECM, Purge Valve & Canister Diagram

This document is a schematic diagram of the evaporative emission (EVAP) control system, uploaded to a 1986 Suzuki Samurai gallery. It illustrates how the ECM (item 3) controls the EVAP solenoid purge (SP) valve using sensed information. The legend identifies ten components: the main switch, main relay, ECM, sensed information input, intake manifold, EVAP SP valve, air (fresh air inlet), EVAP canister, tank pressure control valve, and fuel tank. ECM connector pins A10, A12, A13, and B25 are shown, with wire colors B/Bl (black/blue) and Lg/Y (light green/yellow) noted on circuits between the relay/switch circuit and the EVAP SP valve. The diagram traces vapor flow from the fuel tank through the tank pressure control valve to the EVAP canister, and from the canister through the EVAP SP valve to the intake manifold. A duty-cycle waveform at the lower right shows the EVAP SP valve switching between ON and OFF states, labeled with 'ON time' and '1 cycle (constant),' indicating the valve is pulse-width (duty-cycle) modulated by the ECM. A reader can learn the component layout, electrical connections, and control strategy of this EVAP purge system.