Evaporative Emissions System: Testing and Inspection

FUEL VAPOR LINES, FUEL TANK AND TANK CAP INSPECTION:
1. VISUALLY INSPECT LINES AND CONNECTIONS.





- Look for loose connections, sharp bends or damage.
2. VISUALLY INSPECT FUEL TANK.
- Look for deformation, cracks or fuel leakage.
3. VISUALLY INSPECT FUEL TANK CAP.





- Check if the cap and/or gasket are deformed or damaged.
- If necessary, repair or replace the cap.

EVAP CONTROL SYSTEM INSPECTION:
1. INSPECT TVV OPERATION WITH COLD ENGINE.
- The engine coolant temperature should be below 45°C (13°F).
- Disconnect the EVAP hose from the union pipe.
- Start the engine.





- Gradually increase the engine speed from idle to 3,000 rpm and check that air suction is not felt at the union pipe.
2. INSPECT OPERATION OF VCV WITH HOT ENGINE.
- Warm up the engine.





- With the engine idling, check that air suction is not felt at union pipe.





- Gradually increase the engine speed to 3,000 rpm and check that there is air suction at the union pipe.
- Reconnect the EVAP hose to the union pipe.
IF NO PROBLEM IS FOUND WITH THIS INSPECTION, SYSTEM IS NORMAL; OTHERWISE INSPECT EACH PART.