EVAP 2-Way Valve

Remove fuel filler cap. Remove fuel tank vapor hose from EVAP 2-way valve. EVAP 2-way valve is located at rear of engine compartment. Connect hose end to a "T" fitting connected to a vacuum/pressure gauge and vacuum pump. See Fig 1 .
Slowly apply vacuum while observing vacuum/pressure gauge. Vacuum should stabilize (valve opens) momentarily within specified range. See EVAP 2-WAY VALVE STABILIZING PRESSURE . If vacuum stabilizes within specified range, go to next step. If vacuum stabilizes less than or more than specified range, replace EVAP 2-way valve and retest.

Move vacuum pump and vacuum gauge from vacuum side to pressure side. See Fig 1 . Slowly pressurize vapor line while observing gauge. Pressure should momentarily stabilize (valve opens) at a pressure greater than specified pressure. See EVAP 2-WAY VALVE STABILIZING PRESSURE . If pressure stabilizes as specified, valve is okay. If pressure does not stabilize as specified, replace EVAP 2-way valve and retest.

EVAP 2-WAY VALVE STABILIZING PRESSURE

Application	in. Hg (kPa)
Vacuum	0.2-0.6 (0.8-2.1)
Pressure	0.3 (1.0)

Fig 1: Testing EVAP 2-Way Valve (Typical)

Courtesy of AMERICAN HONDA MOTOR CO., INC.