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Diagnostic Procedure For Ambient Sensor

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Ambient sensor circuit is open or shorted. (40 or 41 is indicated on front air control As a result of conducting the front air control self-diagnosis)

Fig 1: Connecting Ambient Sensor Circuit Between Front Air Control Connector
G00866834Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND 
    1. Disconnect ambient sensor connector.
    2. Turn ignition switch ON.
    3. Check voltage between ambient sensor harness connector E1 terminal 1 (O/B) and ground.

      Approx. 5V 

      Fig 2: Checking Voltage Between Ambient Sensor Harness Connector And Ground
      G00866835Courtesy 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 AMBIENT SENSOR AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector.
    3. Check continuity between ambient sensor harness connector E1 terminal 2 (GR/R) and front air control harness connector M49 terminal 17 (GR/R).

      Continuity should exist. 

      Fig 3: Checking Circuit Continuity Between Ambient Sensor And Front Air Control
      G00866836Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

    Refer to "AMBIENT SENSOR ".

    OK or NG 

    1. OK
      1. Replace front air control.
      2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
    2. NG
      1. Replace ambient sensor.
      2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
  4. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector.
    3. Check continuity between ambient sensor harness connector E1 terminal 1 (O/B) and front air control harness connector M49 terminal 21 (O/B).

      Continuity should exist. 

    4. Check continuity between ambient sensor harness connector E1 terminal 1 (O/B) and ground.

      Continuity should not exist. 

      Fig 4: Checking Circuit Continuity Between Ambient Sensor And Front Air Control
      G00866837Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK
      1. Replace front air control.
      2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform the self-diagnosis.
    2. NG: Repair harness or connector.
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