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Home >> Honda >> 2002 >> Odyssey Cargo >> Repair and Diagnosis >> Engine Performance >> System >> EVAP System >> DTC Troubleshooting >> DTC P1456 '01 Model: EVAP Control System Leakage (fuel tank system) >> EVAP Bypass Solenoid Valve Test

EVAP Bypass Solenoid Valve Test

  1. Disconnect both vacuum hoses from the EVAP two way valve (A), and connect a vacuum pump to the canister port on the two way valve.
    Fig 1: Disconnecting Both Vacuum Hoses From The EVAP Two Way Valve
    G01511865Courtesy of AMERICAN HONDA MOTOR CO., INC.
  2. Turn the bypass solenoid valve on with the HDS, or connect PCM connector terminal E23 to body ground with a jumper wire.
    Fig 2: Connecting PCM Connector Terminal E23 To Body Ground With A Jumper Wire
    G01511866Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Turn the ignition switch ON (II).
  4. Apply vacuum to the hose.

    Does the valve hold vacuum? 

    1. YES:  Go to step 5.
    2. NO:  Go to step  10.
  5. Turn the ignition switch OFF.
  6. Disconnect the EVAP bypass solenoid valve 2P connector.
  7. Check for continuity between EVAP bypass solenoid valve 2P connector terminal No. 2 and body ground.
    Fig 3: Checking For Continuity Between EVAP Bypass Solenoid Valve 2P Connector Terminal No. 2 & Body Ground
    G01511867Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES:  Go to step 8.

    NO:  Repair open in wire between the EVAP bypass solenoid valve and the PCM (E23).

  8. Turn the ignition switch ON (II).
  9. Measure voltage between EVAP bypass solenoid valve 2P connector terminal No. 1 and body ground.
    Fig 4: Measuring Voltage Between EVAP Bypass Solenoid Valve 2P Connector Terminal No. 1 & Body Ground (1 Of 2)
    G01511868Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 5: Measuring Voltage Between EVAP Bypass Solenoid Valve 2P Connector Terminal No. 1 & Body Ground (2 Of 2)
    G01511869Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES:  Replace the EVAP bypass solenoid valve (A) and the O-rings (B).
    2. NO:  Repair open in the wire between the EVAP bypass solenoid valve and No. 6 ECU (PCM) CRUISE CONTROL (15A) fuse.
  10. Plug the upper port (A) of the EVAP two way valve.
    Fig 6: Plugging The Upper Port Of The EVAP Two Way Valve
    G01511870Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. While monitoring the FTP sensor voltage with the HDS, or while measuring the voltage between PCM connector terminals E3 and E28, slowly pump the vacuum pump until the voltage drops to about 1.5 V.

    Does the voltage drop to 1.5 V and hold for at least 20 seconds? 

    1. YES:  The EVAP bypass solenoid valve/EVAP two way valve is OK. Go to step  1.
    2. NO:  Repair leakage from the EVAP bypass solenoid valve, EVAP two way valve, FTP sensor, or O-rings.
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