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

This document is a schematic diagram of the evaporative emission (EVAP) canister purge control system, uploaded as part of a factory-style wiring/vacuum diagram set for a 1986 Suzuki Samurai. The diagram shows the relationship between the main switch (1), main relay (2), and ECM (3), with ECM connector pins A10, A12, A13, and B25 identified. Wire colors B/Bl (black/blue) and Lg/Y (light green/yellow) are labeled on circuits to the ECM. The vacuum/plumbing portion of the schematic shows the intake manifold (5), EVAP SP (solenoid purge) valve (6), an air inlet (7), the EVAP canister (8), the tank pressure control valve (9), and the fuel tank (10). Item 4 indicates "sensed information" inputs to the ECM. A duty-cycle timing chart at the lower right illustrates the EVAP SP valve switching between ON and OFF states, with the "ON time" varying within a constant "1 cycle" period, showing that the ECM pulse-width-modulates the purge solenoid. A reader can learn the overall layout of the canister purge system, which ECM pins and wire colors are involved, and how the purge valve is duty-cycle controlled.