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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. See Fig 1. 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 off and wait for at least 7 seconds. Turn ignition on. Check operating sound of solenoid valve while connecting and disconnecting EGRC solenoid valve harness connector. If valve is not operating, repair or replace valve as necessary. If valve is functioning properly, go to next step.
  3. Remove EGR valve & EVAP canister purge control solenoid valve. Using a hand vacuum pump, apply vacuum to EGR vacuum port. EGR valve spring should lift. If valve spring fails to lift, replace EGR valve. If EGR valve operates normally, go to next step.
  4. Check EVAP canister for leaks, by gently blowing air into port. If any leakage exists, replace EVAP canister. Check carbon canister for damage or clogging. Inspect EGR temperature sensor and EVAP canister purge control solenoid valve. See appropriate circuit test.
Fig 1: Checking Vacuum Source To EGR Valve
G96J11485Courtesy of NISSAN MOTOR CO., U.S.A.
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