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Diagnostic Procedure For Intake Sensor

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Intake sensor circuit is open or shorted. (56, 57 or DTC B2581, B2582 is indicated on front air control as a result of conducting Self-diagnosis).

Fig 1: Intake Sensor Circuit
G03600788Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND 
    1. Disconnect intake sensor connector.
    2. Turn ignition switch ON.
    3. Check voltage between intake sensor harness connector M146 terminal 2 (L/B) and ground.

      2 - Ground: Approx. 5V 

    OK or NG 

    1. OK: GO TO 2.
    2. NG: GO TO  4.
      Fig 2: Checking Voltage Between Intake Sensor Harness Connector M146 Terminal 2 (L/B) And Ground
      G03600789Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector.
    3. Check continuity between intake sensor harness connector M146 terminal 1 (V/R) and front air control harness connector M49 terminal 21 (V/R).

      1 - 21: Continuity should exist.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair harness or connector as necessary.
      Fig 3: Checking Continuity Between Intake Sensor Harness Connector M146 Terminal 1 (V/R) And Front Air Control Harness Connector M49 Terminal 21 (V/R)
      G03600790Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK INTAKE SENSOR 

    Refer to "Intake Sensor Circuit ".

    OK or NG 

    1. OK:
      1. Replace front air control. Refer to "CONTROL UNIT ".
      2. Go to self-diagnosis "A/C System Self-diagnosis Function (With NAVI Only) " and perform self-diagnosis.
    2. NG:
      1. Replace intake sensor. Refer to "INTAKE SENSOR ".
      2. Go to self-diagnosis "A/C System Self-diagnosis Function (With NAVI Only) " and perform self-diagnosis.
  4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector.
    3. Check continuity between intake sensor harness connector M146 terminal 2 (L/B) and front air control harness connector M49 terminal 9 (L/B).

      2 - 9: Continuity should exist.

    4. Check continuity between intake sensor harness connector M146 terminal 2 (L/B) and ground.

      2 - Ground: Continuity should not exist.

      Fig 4: Checking Continuity Between Intake Sensor Harness Connector M146 Terminal 2 (L/B), Front Air Control Harness Connector M49 Terminal 9 (L/B) And Ground
      G03600791Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK:
      1. Replace front air control. Refer to "CONTROL UNIT ".
      2. Go to self-diagnosis "A/C System Self-diagnosis Function (With NAVI Only) " and perform self-diagnosis.
    2. NG: Repair harness or connector as necessary.
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