Diagnostic Procedure For Ambient Sensor

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 Between Front Air Control Connectors

Courtesy 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 

   OK or NG 

   1. OK: GO TO 2.
   2. NG: GO TO  4.
   Fig 2: Checking Voltage Between Ambient Sensor Harness Connector E1 Terminal 1 (O/B) And Ground
   Courtesy of NISSAN MOTOR CO., U.S.A.
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. 

   OK or NG 

   1. OK: GO TO 3.
   2. NG: Repair harness or connector.
      Fig 3: Checking Continuity Between Ambient Sensor Harness Connector E1 Terminal 2 (GR/R) And Front Air Control Harness Connector M49 Terminal 17 (GR/R)

      Courtesy of NISSAN MOTOR CO., U.S.A.
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 Continuity Between Ambient Sensor Harness Connector E1 Terminal 1 (O/B), Front Air Control Harness Connector M49 Terminal 21 (O/B) And Ground

      Courtesy 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 self-diagnosis
   2. NG: Repair harness or connector.