EVAP Bypass Solenoid Valve Test

10. Disconnect both vacuum hoses from the EVAP two way valve (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the canister port on the two way valve.

Fig 1: Disconnecting Both Vacuum Hoses From EVAP Two Way Valve
Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Turn the ignition switch ON (II).
12. Apply vacuum to the hose.
Does the valve hold vacuum?
1. YES - The EVAP bypass solenoid valve/EVAP two way valve is OK. Go to step 18.
2. NO - Go to step 13.
13. Turn the ignition switch OFF.
14. Disconnect the EVAP bypass solenoid valve 2P connector.
15. Check for continuity between EVAP bypass solenoid valve 2P connector terminal No. 2 and body ground.

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

Fig 3: Identifying EVAP Bypass Solenoid Valve And O-Rings
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 16.
2. NO - Replace the EVAP bypass solenoid valve (A) and O-rings (B).
16. Disconnect ECM connector A (32P).
17. Check for continuity between EVAP bypass solenoid valve 2P connector terminal No. 2 and body ground.

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

Is there continuity?
1. YES - Repair the short in the wire between the EVAP bypass solenoid valve and the ECM (A3).
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 ).