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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  - Inspect EGRC solenoid valve and EGR temperature sensor. See the SYSTEM/COMPONENT TESTS article. Replace EGRC solenoid valve and EGR temperature sensor as required. Disconnect and reconnect harness connectors in circuit and perform FINAL CHECK .
Fig 1: Checking Vacuum Source To EGR Valve
G95G33254Courtesy of NISSAN MOTOR CO., U.S.A.
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