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DTC P0400 - EGR Function

  1. Check Vacuum Source To EGR Valve

    Start engine and allow it to warm up. Set engine speed between 2000-4000 RPM. Disconnect vacuum hose to EGR valve. Verify vacuum exists. If no vacuum exists, inspect vacuum hose for clogging, cracks or improper connection. If vacuum exists, go to next step.

  2. Check Component

    Start engine and allow it to warm up. Turn ignition switch to OFF position and wait for at least 5 seconds. Turn ignition switch to ON position. Check operating sound of solenoid valve while disconnecting and reconnecting EGR valve & EVAP canister purge control solenoid valve harness connector. If valve is not functioning properly, repair or replace valve as required. If valve is functioning properly, go to next step.
  3. Inspect EGR valve, EVAP canister purge control solenoid valve, EVAP canister and EGRC-BPT valve. See procedures in the SYSTEM/COMPONENT TESTS article. Replace components as required. Disconnect and reconnect harness connectors in circuit and perform FINAL CHECK .
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