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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 999 (Heater & Air Conditioning Control System) >> With Monochrome Display >> Component Diagnosis >> B2581, B2582 Intake Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK INTAKE SENSOR POWER SUPPLY
    1. Disconnect intake sensor connector.
    2. Turn ignition switch ON.
    3. Check voltage between intake sensor harness connector M69 terminal 1 and ground.

      1 - Ground: Approx. 5V 

      Fig 1: Checking Voltage Between Intake Sensor Harness Connector M69 Terminal 1 And Ground
      G05875926Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: GO TO  4.

  2. CHECK CONTINUITY BETWEEN INTAKE SENSOR AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between intake sensor harness connector M69 (A) terminal 2 and A/C auto amp. harness connector M37 (B) terminal 37.

      2 - 37: Continuity should exist. 

      Fig 2: Checking Continuity Between Intake Sensor Connector M69 Terminal 2 And A/C Auto Amp Connector M37 Terminal 37
      G05875927Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair harness or connector.

  3. CHECK INTAKE SENSOR

    Check intake sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

    NO: Replace intake sensor. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK CONTINUITY BETWEEN INTAKE SENSOR AND A/C AUTO AMP.
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between intake sensor harness connector M69 (A) terminal 1 and A/C auto amp. harness connector M37 (B) terminal 16.

      1 - 16: Continuity should exist. 

      Fig 3: Checking Continuity Between Intake Sensor Connector M69 Terminal 1 And A/C Auto Amp Connector M37 Terminal 16
      G05875928Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between intake sensor harness connector M69 (A) terminal 1 and ground.

      1 - Ground: Continuity should not exist. 

    Is the inspection result normal? 

    YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair harness or connector.

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