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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> Diagnostic Tests >> DTC P0403: EGR Volume Control Valve Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit wiring diagram, see Fig 1 . For connector identification and locations, see CONNECTOR IDENTIFICATION  .

  1. Check EGR-VCV Power Supply Circuit

    Turn ignition off. Disconnect EGR-VCV harness connector. See Figure . Turn ignition on. Measure voltage between ground and EGR-VCV harness connector terminals No. 2 and 5. See Figure . If battery voltage exists, go to step  3 . If battery voltage does not exist, go to next step.

  2. Detect Malfunctioning Part

    Check the following:
    • Fuse and fusible link box connector E22.
    • Fuse No. 34 (15-amp).
    • Harness connectors E9 and F47.
    • Harness for open or short between fuse and ECM relay.
    • ECM relay.
    • Harness for open or short between ECM relay and EGR-VCV.

    Repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair.

  3. Check EGR-VCV Output Signal Circuit

    Turn ignition off. Disconnect ECM harness connector. See Figure . Check continuity of the following:
    • Between EGR-VCV harness connector terminal No. 1 and ECM harness connector terminal No. 8.
    • Between EGR-VCV harness connector terminal No. 3 and ECM harness connector terminal No. 17.
    • Between EGR-VCV harness connector terminal No. 4 and ECM harness connector terminal No. 9.
    • Between EGR-VCV harness connector terminal No. 6 and ECM harness connector terminal No. 18.

    See Figure . Continuity should exist. Also, check harness for short to ground and short to power. If problem is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  4. Check EGR Volume Control Valve

    Check EGR-VCV as shown in illustration. See Figure . If EGR-VCV is okay, go to next step. If EGR-VCV is not okay, replace EGR-VCV. Perform DTC CONFIRMATION TEST  to verify repair.

  5. Check For Intermittent

    Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Perform DTC CONFIRMATION TEST  to verify repair.
Fig 1: EGR Volume Control Valve Wiring Diagram
G00164644Courtesy of NISSAN MOTOR CO., U.S.A.
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