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DTC P0400: EGR Function: Procedure

  1. Check exhaust system for leaks and repair as necessary. Disconnect EGR-VCV harness connector. See Fig 1. Turn ignition on. Measure voltage between ground and EGR-VCV harness connector terminals No. 2 and 5 (Red wires). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect ECM harness connector. See Figure. Check continuity of the following wires:
    • Green wire between EGR-VCV harness connector terminal No. 1 and ECM harness connector terminal No. 9.
    • Blue/Black wire between EGR-VCV harness connector terminal No. 4 and ECM harness connector terminal No. 10.
    • Brown wire between EGR-VCV harness connector terminal No. 3 and ECM harness connector terminal No. 18.
    • Pink wire between EGR-VCV harness connector terminal No. 6 and ECM harness connector terminal No. 19.

    See Figure. Also check circuits for short to ground and short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.

  3. Check EGR passages for clogging or leaks. Repair as necessary. If EGR passages are okay, check EGR temperature sensor and circuit. See DTC P1401: EGR TEMPERATURE SENSOR . Repair as necessary and retest system. If EGR temperature sensor and circuit are okay, go to next step.
  4. Measure resistance between EGR-VCV terminals No. 2 and 1, 2 and 3, 5 and 4, and 5 and 6. See Fig 2. Resistance should be 20.9-23.1 ohms at 68°F (20°C). If resistance is not as specified, replace EGR-VCV and retest system. If resistance is as specified, go to next step.
  5. Remove EGR-VCV and reconnect all harness connectors. Ensure EGR-VCV shaft moves smoothly when ignition is turned on and off. If EGR-VCV does not operate as specified, replace EGR-VCV and retest system. If EGR-VCV operates as specified, go to next step.
  6. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
Fig 1: Locating EGR Volume Control Valve & IACV-AAC Valve
G99D54802Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Testing EGR Volume Control Valve
G99J08878Courtesy of NISSAN MOTOR CO., U.S.A.
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