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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> NVIS (NISSAN Vehicle Immobilizer System-NATS) >> NVIS (NISSAN Vehicle Immobilizer System - NATS) >> Trouble Diagnoses >> Diagnostic Procedure 2 >> Self-diagnostic results:

Self-diagnostic results:

"CHAIN OF ECM-IMMU" displayed on CONSULT-II screen 

  1. CONFIRM SELF-DIAGNOSTIC RESULTS 

    Confirm SELF-DIAGNOSTIC RESULTS "CHAIN OF ECM-IMMU" displayed on CONSULT-II screen.

    NOTE: In rare cases, "CHAIN OF ECM-IMMU" might be stored during key registration procedure, even if the system is not malfunctioning.

    Is CONSULT-II screen displayed as shown?

    Yes : GO TO 2.

    No : GO TO "SYMPTOM MATRIX CHART 1 (SELF-DIAGNOSIS RELATED ITEM)  ".

    Fig 1: CONSULT-II Display - "CHAIN OF ECM-IMMU"
    G01333075Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK POWER SUPPLY CIRCUIT FOR NVIS (NATS) IMMU 
    1. Disconnect NVIS (NATS) IMMU connector.
    2. Check voltage between terminal 8 of NVIS (NATS) IMMU and ground with CONSULT-II or tester.
      Fig 2: Checking NVIS (NATS) IMMU Power Supply Circuit
      G01333076Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    OK : GO TO 3.

    NG : Check the following

    • 10A fuse (No. 36, located in the fuse and fusible link box)
    • Harness for open or short between fuse and NVIS (NATS) IMMU connector Ref. Part No. C1 
  3. CHECK IGN SW. ON SIGNAL 
    1. Turn ignition switch ON.
    2. Check voltage between NVIS (NATS) IMMU harness connector E111 terminal 7 (BR) (QG18DE) or (G/W) (QR25DE) and ground with CONSULT-II or tester.

      Battery voltage should exist. 

      Fig 3: Checking Ignition Switch On Signal
      G01333077Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    OK : GO TO 4.

    NG : Check the following

    • 10A fuse [No. 20, located in the fuse block (J/B)]
    • Harness for open or short between fuse and NVIS (NATS) IMMU connector

      Ref. part No. C2 

  4. CHECK GROUND CIRCUIT FOR NVIS (NATS) IMMU 
    1. Turn ignition switch OFF.
    2. Check harness continuity between NVIS (NATS) IMMU terminal 4 and ground.
      Fig 4: Checking NVIS (NATS) IMMU Ground Circuit
      G01333078Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    OK : GO TO 5.

    NG : Repair harness. Ref. part No. C3 

  5. CHECK COMMUNICATION LINE OPEN CIRCUIT 
    1. Disconnect ECM connector.
    2. Check harness continuity between ECM harness connector F22 (QG18DE) or F54 (QR25DE) terminal 116 (QG18DE) or 31 (QR25DE) (BR/Y) and NVIS (NATS) IMMU connector E111 terminal1 (BR/Y).

      Continuity should exist. 

      OK or NG

      OK : GO TO 6.

      NG :

      • Repair harness or connector.
      • Ref. part No. C4 
      Fig 5: Checking Communication Line Open Circuit
      G01333079Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK COMMUNICATION LINE BATTERY SHORT CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between ECM harness connector F22 (QG18DE) or F54 (QR25DE) terminal 116 (QG18DE) or 31 (QR25DE) (BR/Y) or NVIS (NATS) IMMU harness connector E111 terminal 1 (BR/Y) and ground.

      Voltage: 0V 

    OK or NG

    OK : GO TO 7.

    NG :

    • Communication line is short-circuited with battery voltage line or ignition switch ON line.
    • Repair harness or connectors.
    • Ref. part No. C4 
      Fig 6: Checking Communication Line Battery Short Circuit
      G01333080Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK COMMUNICATION LINE GROUND SHORT CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between ECM harness connector F22 (QG18DE) or F54 (QR25DE) terminal 116 (QG18DE) or 31 (QR25DE) (BR/Y) or NVIS (NATS) IMMU connector E111 terminal 1 (BR/Y) and ground.

      Continuity should not exist. 

    OK or NG

    OK : GO TO 8.

    NG :

    • Communication line is short-circuited with ground line.
    • Repair harness or connectors.
    • Ref. part No. C4 
    Fig 7: Checking Communication Line Ground Short Circuit
    G01333081Courtesy of NISSAN MOTOR CO., U.S.A.
  8. SIGNAL FROM ECM TO NVIS (NATS) IMMU CHECK 
    1. Check the signal between ECM terminal 116 and ground with CONSULT-II or oscilloscope when ignition switch is turned "ON".
    2. Make sure signals which are shown in the figure below can be detected during 750 msec. just after ignition switch is turned "ON".
      Fig 8: Checking Signal From ECM To NVIS (NATS) IMMU
      G01333082Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    OK :

    • NVIS (NATS) IMMU is malfunctioning.
    • Replace NVIS (NATS) IMMU. Ref. part No. A 
    • Perform initialization with CONSULT-II.
    • For the operation of initialization, refer to "CONSULT-II OPERATION MANUAL IVIS/NVIS".

    NG :

    • ECM is malfunctioning.
    • Replace ECM. Ref. part No.B 
    • Perform initialization with CONSULT-II.
    • For the operation of initialization, refer to "CONSULT-II OPERATION MANUAL IVIS/NVIS".
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