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Diagnostic Procedure For Intake Sensor

WARNING: This page is about a different car, the 2004 Nissan Murano. 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 performing Self-diagnosis STEP-2.)

Fig 1: Identifying Intake Sensor Circuit
G00731442Courtesy 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 M256 terminal 1 (R/W) and ground.
      1. 1 - Ground: Approx. 5V 
      Fig 2: Checking Voltage Between Intake Sensor Harness Connector And Ground
      G00731443Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 2.
    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 M256 terminal 2 (B/Y) and unified meter and A/C amp. harness connector M51 terminal 49 (B/Y).
      1. 2 - 49: Continuity should exist. 
      Fig 3: Checking Continuity Between Intake Sensor Harness Connector And Unified Meter And A/C Amp. Harness Connector
      G00731444Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair harness or connector.
  3. CHECK INTAKE SENSOR 

    Refer to "INTAKE SENSOR ".

    OK or NG 

    1. OK:
      1. Replace unified meter and A/C amp.
      2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
    2. NG:
      1. Replace intake sensor.
      2. Go to self-diagnosis "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 M256 terminal 1 (R/W) and unified meter and A/C amp. harness connector M51 terminal 41 (R/Y).
      1. 1 - 41: Continuity should exist. 
    4. Check continuity between intake sensor harness connector M256 terminal 1 (R/W) and ground.
      1. 1 - Ground: Continuity should not exist. 
      Fig 4: Checking Continuity Between Intake Sensor Harness Connector And Ground
      G00731445Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK:
      1. Replace unified meter and A/C amp.
      2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
    2. NG: Repair harness or connector.
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