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DTC P0440/16824 - EVAP System Malfunction

NOTE: ECM sets DTC if it senses an Evaporative (EVAP) canister purge regulator valve malfunction.
  1. Turn ignition off. Disconnect EVAP canister purge regulator valve connector. Disconnect ECM connector. Using a DVOM, check resistance between EVAP canister purge regulator valve connector terminals No. 1 and 2. Resistance should be infinite (no continuity). If resistance is as specified, go to next step. If resistance is not as specified, locate and repair short circuit between EVAP canister purge regulator valve connector and ECM. Erase DTC memory and test drive vehicle. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  2. Replace EVAP canister purge valve. Erase DTC memory and test drive vehicle. See CLEARING DTCS  in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  3. Replace faulty ECM. Test drive vehicle. Recheck DTC memory and verify DTC does not reset. If DTC resets, repeat testing procedure.
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