Evaporative Emission Control System

EVAP Two Way Valve Test

 11-464  

  1. Remove the fuel cap.
  1. Disconnect the vapour line from the EVAP two way valve (A). Connect it to a T-fitting (B) from the vacuum gauge (C) and the vacuum pump (D) as shown.

  1. Apply vacuum slowly and continuously while watching the gauge.

The vacuum should stabilise momentarily at 0.8-2.1 kPa (6-16 mmHg, 0.2-0.6 in.Hg).

If the vacuum stabilises (valve opens) below 0.8 kPa (6 in.Hg), or above 2.1 kPa (16 mmHg, 0.6 in.Hg), install a new valve and retest.
  1. Move the vacuum pump hose from the vacuum fitting to the pressure fitting, and move the vacuum gauge hose from the vacuum side to the pressure side (A) as shown.

  1. Slowly pressurise the vapour line while watching the gauge. The pressure should stabilise momentarily above 1.0 kPa (8 mmHg, 0.3 in.Hg).
  • If the pressure momentarily stabilises (valve opens) above 1.0 kPa (8 mmHg, 0.3 in.Hg), the valve is OK.
  • If the pressure stabilises below 1.0 kPa (8 mmHg, 0.3 in.Hg), install a new valve and retest.