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Diagnostic Procedure For Intake Sensor

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Intake sensor circuit is open or shorted. (24 or -24 is indicated on unified meter and A/C amp. as a result of conducting Self-diagnosis STEP 2.)

Fig 1: Identifying Intake Sensor Circuit Diagram
G04878081Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND 
    1. Turn ignition switch OFF.
    2. Disconnect intake sensor connector.
    3. Turn ignition switch ON.
    4. Check voltage between intake sensor harness connector M33 terminal 1 and ground.

      1 - Ground: Approx. 5V 

    Fig 2: Checking Voltage Between Intake Sensor Harness Connector M33 Terminal 1 And Ground
    G04917626Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  2.

    NG: GO TO  4.

  2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP  .
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. connector.
    3. Check continuity between intake sensor harness connector M33 terminal 2 and unified meter and A/C amp. harness connector M89 terminal 49.

      2 - 49: Continuity should exist  .

    Fig 3: Checking Continuity Between Intake Sensor And Unified Meter And A/C Amp. Connector Terminal
    G04917627Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  3.

    NG: Repair harness or connector.

  3. CHECK INTAKE SENSOR 

    Refer to "INTAKE SENSOR ".

    OK or NG 

    OK:

    1. Replace unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP ".
    2. Go to "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP 2. Confirm that code No. 20 is displayed.

    NG:

    1. Replace intake sensor. Refer to "INTAKE SENSOR ".
    2. Go to "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP 2. Confirm that code No. 20 is displayed.
  4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP  .
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. connector.
    3. Check continuity between intake sensor harness connector M33 terminal 1 and unified meter and A/C amp. harness connector M89 terminal 41.

      1 - 41: Continuity should exist  .

    4. Check continuity between intake sensor harness connector M33 terminal 1 and ground.

      1 - Ground: Continuity should not exist  .

    Fig 4: Checking Continuity Between Intake Sensor And Unified Meter And A/C Amp. Connector Terminal
    G04917628Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK:

    1. Replace unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP .".
    2. Go to "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP 2. Confirm that code No. 20 is displayed.

      NG: Repair harness or connector.

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