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DTC P0441 - EVAP System Incorrect Purge Flow

  1. Connect and operate scan tester, following manufacturer's instructions. Clear codes. Operate engine at 3000 RPM until fan comes on. Test-drive vehicle with A/T in D4 position at engine speed between 2000-2700 RPM. If DTC 0441 appears, go to next step. If DTC P0441 does not appear, problem is intermittent. Inspect for loose sensor, poor connections, or loose wires associated with purge control solenoid valve and PCM, then repair as necessary.
  2. Turn ignition off. Inspect all EVAP system vacuum lines for misrouting, leakage, restriction, or breakage. If vacuum lines are okay, go to next step. Repair or replace vacuum lines as necessary.
  3. Disconnect vacuum line from EVAP purge flow switch. Connect vacuum gauge to hose. Start and run engine at 2000-2700 RPM. If vacuum is 2.4 in. Hg or greater, go to next step. If vacuum is less than 2.4 in. Hg, go to step 7).
  4. Turn ignition off. Reconnect vacuum hose which was disconnected in previous step. Disconnect upper vacuum hose from EVAP canister diaphragm. Connect vacuum gauge to hose. Start engine. If vacuum does not exist, go to next step. If vacuum exists, temporarily substitute known good EVAP control canister, then retest system.
  5. Unplug 2-pin connector from EVAP purge control solenoid valve. If vacuum now exists, go to next step. If vacuum does not exist, inspect for proper vacuum hose routing. If hose is okay, replace EVAP purge control solenoid valve.
    NOTE: When substituting a known-good PCM, immobilizer code must be rewritten using Honda PGM tester, or engine will not start.
  6. Turn ignition off. Unplug PCM connector "A". See Figure . Test for continuity between ground and Red wire at EVAP purge control solenoid valve harness connector. If continuity exists, repair shorted Red wire. If continuity does not exist, temporarily substitute known good PCM, then recheck for DTC.
  7. Turn ignition off. Unplug PCM connector "D". See Figure . Check for continuity between ground and terminal No. 15 at PCM connector "D". If continuity to ground exists, go to next step. If continuity does not exist, temporarily substitute known good PCM, then recheck for DTC.
  8. Unplug 2-pin connector from EVAP purge control switch. Repeat testing procedure as in step 7). If continuity exists, repair shorted EVAP purge flow circuit (Brown wire). If continuity does not exist, replace EVAP purge flow switch.
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