What components are shown in the EVAP canister purge system diagram?

The legend lists: 1. Main switch, 2. Main relay, 3. ECM, 4. Sensed information, 5. Intake manifold, 6. EVAP SP valve, 7. Air, 8. EVAP canister, 9. Tank pressure control valve, 10. Fuel tank.

Which ECM connector pins are used in the canister purge circuit?

The diagram identifies ECM pins A10, A12, A13, and B25.

What wire colors are shown in the purge control circuit?

B/Bl (black/blue) on the circuit near pins A12/A13, and Lg/Y (light green/yellow) on the circuit to pin B25.

How is the EVAP SP valve controlled?

The timing chart shows the EVAP SP valve switching ON and OFF, with a variable ON time within a constant 1-cycle period, indicating duty-cycle (pulse) control by the ECM.

What controls pressure between the fuel tank and the EVAP canister?

A tank pressure control valve (item 9) is shown in the line between the fuel tank (item 10) and the EVAP canister (item 8).

Home/ Registry/ Suzuki/ Samurai/ 1986-1995/ “Little Blue”/ Photo supermotors.net/registry/media/420638

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

EVAP fuel-vapor system schematic with canister, purge valves, fuel tank and ECM

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EVAP emissions system schematic showing the charcoal canister, purge/SP valves, tank pressure control valve, fuel tank and ECM connections.

AI caption August 2006 · Photo 7 of 86

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.

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Frequently asked questions

What components are shown in the EVAP canister purge system diagram?: The legend lists: 1. Main switch, 2. Main relay, 3. ECM, 4. Sensed information, 5. Intake manifold, 6. EVAP SP valve, 7. Air, 8. EVAP canister, 9. Tank pressure control valve, 10. Fuel tank.
Which ECM connector pins are used in the canister purge circuit?: The diagram identifies ECM pins A10, A12, A13, and B25.
What wire colors are shown in the purge control circuit?: B/Bl (black/blue) on the circuit near pins A12/A13, and Lg/Y (light green/yellow) on the circuit to pin B25.
How is the EVAP SP valve controlled?: The timing chart shows the EVAP SP valve switching ON and OFF, with a variable ON time within a constant 1-cycle period, indicating duty-cycle (pulse) control by the ECM.
What controls pressure between the fuel tank and the EVAP canister?: A tank pressure control valve (item 9) is shown in the line between the fuel tank (item 10) and the EVAP canister (item 8).