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Home >> Honda >> 2000 >> Prelude Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1456: EVAP System Leak Detected >> EVAP Purge Control Solenoid Valve Test
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EVAP Purge Control Solenoid Valve Test

  1. Disconnect hose between intake manifold and EVAP purge control solenoid valve from EVAP purge control solenoid valve. Turn ignition on. Apply vacuum to exposed port. If vacuum does not hold, go to next step. If vacuum holds, EVAP purge control solenoid valve is okay at this time. Perform EVAP bypass solenoid valve test. See EVAP BYPASS SOLENOID VALVE TEST  .
  2. Turn ignition off. Disconnect EVAP purge control solenoid valve connector. Check for continuity between ground and EVAP purge control solenoid valve harness connector terminal No. 2 (Red/Yellow wire). If continuity exists, go to next step. If continuity does not exist, replace solenoid valve.
  3. Disconnect PCM 32-pin connector "A". See Figure . Check for continuity between ground and EVAP purge control solenoid valve harness connector terminal No. 2 (Red/Yellow wire). If continuity exists, repair short in Red/Yellow wire between EVAP purge control solenoid valve and PCM 32-pin connector terminal No. 15. If continuity does not exist, substitute a known-good PCM and recheck. See SUBSTITUTING PCM under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If symptom or problem goes away, replace original PCM.
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