EVAP Canister Purge Valve Test

3. Disconnect the vacuum hose from the EVAP purge joint (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the hose.

Fig 1: Disconnecting Vacuum Hose From EVAP Purge Joint
Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. Turn the ignition switch ON (II).
5. Apply vacuum to the hose.
Does the valve hold vacuum?
1. YES - The EVAP canister purge valve is OK. Go to step 11.
2. NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Disconnect the EVAP canister purge valve 2P connector.
8. Check for continuity between EVAP canister purge valve 2P connector terminal No. 2 and body ground.

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

Is there continuity?
1. YES - Go to step 9.
2. NO - Replace the EVAP canister purge valve.
9. Disconnect ECM connector A (32P).
10. Check for continuity between EVAP canister purge valve 2P connector terminal No. 2 and body ground.

Fig 3: Checking For Continuity Between EVAP Canister Purge 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 purge valve and the ECM (A6).
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 ).