EVAP Canister Vent Shut Valve Test

22. Disconnect the vacuum hose from the EVAP canister vent filter line (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the hose.

Fig 1: Disconnecting Vacuum Hose From EVAP Canister Vent Filter Line
Courtesy of AMERICAN HONDA MOTOR CO., INC.
23. Turn the ignition switch ON (II).
24. Apply vacuum to the hose with 5 strokes of the pump.
Does the valve hold vacuum?
1. YES - Go to step 25.
2. NO - The EVAP canister vent shut valve is OK. Go to step 30.
25. Turn the ignition switch OFF.
26. Disconnect the EVAP canister vent shut valve 2P connector.
27. Check for continuity between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground.

Fig 2: Checking Continuity Between EVAP Canister Vent Shut Valve 2P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Identifying Canister Vent Shut Valve And O-Ring
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 28.
2. NO - Replace the EVAP canister vent shut valve (A) and the O-ring (B).
28. Disconnect ECM connector A (32P).
29. Check for continuity between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground.

Fig 4: Checking Continuity Between EVAP Canister Vent Shut Valve 2P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair short in the wire between the EVAP canister vent shut valve and the ECM (A4).
2. NO - Substitute a known-good ECM (see HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES ) and recheck. If the symptom/indication goes away, replace the original ECM (see ECM REPLACEMENT ).