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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 P0505, DTC P0506 Or DTC P0507 >> 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 PCV Hose Connection

    Confirm that PCV hose is connected correctly. If problem is found, repair as necessary. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  . If problem is not found, go to next step.

  2. Check Power Supply Circuit

    Turn ignition off. Disconnect IACV-AAC valve harness connector. See Fig 2 . Turn ignition on. Measure voltage between ground and IACV-AAC valve harness connector terminals No. 2 and 5. See Fig 1 . If battery voltage exists, go to step  4 . If battery voltage does not exist, go to next step.

  3. Detect Malfunctioning Part

    Check the following:
    • Check fuse No. 34 (15-amp) located in fuse and fusible link box on left side of engine compartment.
    • Fuse and fusible link box connector E22.
    • Harness connectors E9 and F47.
    • Harness for open or short between fuse and ECM relay.
    • ECM relay.
    • Check for open or short between IACV-AAC valve and ECM relay.

    Repair as necessary. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  .

  4. Check Output Signal Circuits

    Turn ignition off. Disconnect ECM harness connector. See Figure . Check continuity between the following:
    • IACV-AAC valve harness connector terminal No. 1 and ECM harness connector terminal No. 6.
    • IACV-AAC valve harness connector terminal No. 4 and ECM harness connector terminal No. 7.
    • IACV-AAC valve harness connector terminal No. 3 and ECM harness connector terminal No. 15.
    • IACV-AAC valve harness connector terminal No. 6 and ECM harness connector terminal No. 16.

    Also, check harness for short to ground and short to power. If problem is found, repair as necessary. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  . If problem is not found, go to next step.

  5. Check Power Steering Air Control Valve Operation

    Reconnect all harness connectors. Disconnect vacuum hose connected to power steering air control valve at air intake duct. See Fig 3 . Start engine and let it idle. Check for vacuum at disconnected hose. If vacuum slightly exists or does not exist, go to next step. If a strong vacuum exists, replace power steering air control valve. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  .

  6. Check Power Steering Air Control Valve Operation

    Check for vacuum at disconnected hose when steering wheel is turned. If a strong vacuum exists, go to step  9 . If a strong vacuum does not exist, go to next step.

  7. Check Vacuum Port

    Turn ignition off. Disconnect power steering air control valve vacuum hose from vacuum port. See Fig 4 . Ensure air flows freely into vacuum port. Clean or repair vacuum port as necessary. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  . If vacuum port is okay, go to next step.

  8. Check Vacuum Hoses & Tubes

    Disconnect vacuum hoses between power steering air control valve, vacuum port and air intake duct. Check hoses and tubes for cracks, clogging, improper connection and disconnection. If problem is found, repair as necessary. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  . If problem is not found, go to next step.

  9. Check IACV-AAC Valve

    Check IACV-AAC valve as shown in illustration. See Fig 5 . If IACV-AAC valve is okay, go to next step. If IACV-AAC valve is not okay, replace IACV-AAC valve. Perform idle air volume learning. See IDLE AIR VOLUME LEARNING  under PROGRAMMING. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  .

  10. Check Target Idle Speed

    Turn ignition off. Reconnect all harness connectors and vacuum hoses. Start engine and warm to normal operating temperature. Also, warm transmission to normal operating temperature.
    • For A/T models with CONSULT-II, drive vehicle until FLUID TEMP SE in DATA MONITOR mode of A/T indicates less than .9 volt.
    • For A/T models without CONSULT-II and M/T models, drive vehicle for 10 minutes.

    On all models, stop vehicle with engine running. Check target idle speed. Target idle speed should be 600-700 RPM (M/T) or 750-850 RPM (A/T). If target idle speed is as specified, go to next step. If target idle does is not as specified, perform idle air volume learning. See IDLE AIR VOLUME LEARNING  under PROGRAMMING.

  11. Check For Intermittent

    Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Perform DTC confirmation tests to verify repair. See DTC CONFIRMATION TEST "A"  .
Fig 1: ISC System Wiring Diagram
G00164662Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Locating IACV-AAC Valve
G00164663Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: Identifying Power Steering Air Control Valve Hose At Air Intake Duct
G00164664Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 4: Identifying Power Steering Air Control Valve Hose At Vacuum Port
G00172712Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 5: Testing IACV-AAC Valve
G00172713Courtesy of NISSAN MOTOR CO., U.S.A.
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