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Diagnostic Procedure For Ambient 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: Ambient sensor circuit is open or shorted. (21 or - 21 is indicated on unified meter and A/C amp. As a result of conducting Self-diagnosis STEP-2.)

Fig 1: Identifying Ambient Sensor Circuit Diagram
G04878060Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND 
    1. Turn ignition switch OFF.
    2. Disconnect ambient sensor connector.
    3. Turn ignition switch ON.
    4. Check voltage between ambient sensor harness connector E1 terminal 1 and ground.

      1 - Ground: Approx. 5V 

    Fig 2: Checking Voltage Between Ambient Sensor Harness Connector E1 Terminal 1 And Ground
    G04917605Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  2.

    NG: GO TO  4.

  2. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT 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 ambient sensor harness connector E1 terminal 2 and unified meter and A/C amp. harness connector M89 terminal 49.

      2 - 49: Continuity should exist  .

    Fig 3: Checking Continuity Between Ambient Sensor And Unified Meter And A/C Amp. Connector Terminal
    G04917606Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  3.

    NG: Repair harness or connector.

  3. CHECK AMBIENT SENSOR 

    Refer to "AMBIENT 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 ambient sensor. Refer to "AMBIENT 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 AMBIENT 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 ambient sensor harness connector E1 terminal 1 and unified meter and A/C amp. harness connector M89 terminal 39.

      1 - 39: Continuity should exist  .

    4. Check continuity between ambient sensor harness connector E1 terminal 1 and ground.

      1 - Ground: Continuity should not exist  .

    Fig 4: Checking Continuity Between Ambient Sensor And Unified Meter And A/C Amp. Connector Terminal
    G04917607Courtesy 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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