Diagnostic Procedure For In-Vehicle Sensor

SYMPTOM: In-vehicle sensor circuit is open or shorted. (30 or 31 is indicated on front air control as a result of conducting Self-diagnosis.

Fig 1: Connecting In-Vehicle Sensor Circuit Between Front Air Control

Courtesy of NISSAN MOTOR CO., U.S.A.

1. CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND 

   Are diagnostic codes 44 or 46 present?

   Yes or No 

   1. Yes : GO TO  6.
   2. No : GO TO 2.
2. CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND 
   1. Disconnect in-vehicle sensor connector.
   2. Turn ignition switch ON.
   3. Check voltage between in-vehicle sensor harness connector M32 terminal 4 (BR/W) and ground.

      Approx. 5V. 

      Fig 2: Checking Voltage Between In-Vehicle Sensor Harness Connector And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   1. OK : GO TO 3.
   2. NG : GO TO  5.
3. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL 
   1. Turn ignition switch OFF.
   2. Disconnect front air control connector.
   3. Check continuity between in-vehicle sensor harness connector M32 terminal 1 (O/B) and front air control harness connector M49 terminal 21 (O/B).

      Continuity should exist. 

      Fig 3: Checking Circuit Continuity Between In-Vehicle Sensor And Front Air Control

      Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   1. OK : GO TO 4.
   2. NG : Repair harness or connector.
4. CHECK IN-VEHICLE SENSOR

   Refer to "IN-VEHICLE SENSOR ".

   OK or NG 

   1. OK
      1. Replace front air control.
      2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform the self-diagnosis.
   2. NG
      1. Replace in-vehicle sensor.
      2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform the self-diagnosis.
5. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL 
   1. Turn ignition switch OFF.
   2. Disconnect front air control connector.
   3. Check continuity between in-vehicle sensor harness connector M32 terminal 4 (BR/W) and front air control harness connector M50 terminal 32 (BR/W).

      Continuity should exist. 

   4. Check continuity between in-vehicle sensor harness connector M32 terminal 4 (BR/W) and ground.

      Continuity should not exist. 

      Fig 4: Checking Circuit Continuity Between In-Vehicle Sensor And Front Air Control

      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 the self-diagnosis.
   2. NG : Repair harness or connector.
6. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR MOTOR AND FRONT AIR CONTROL (SELF-DIAGNOSIS CODES 44 OR 46) 
   1. Turn ignition switch OFF.
   2. Disconnect front air control connector and in-vehicle sensor connector.
   3. Check continuity between in-vehicle sensor harness connector M32 terminal 2 (W/R) and 3 (BR) and front air control harness connector M50 terminal 44 (W/R) and 43 (BR).

      Continuity should exist. 

   4. Check continuity between in-vehicle sensor harness connector M32 terminal 2 (W/R) and 3 (BR) and ground.

      Continuity should not exist. 

      Fig 5: Checking Circuit Continuity Between In-Vehicle Sensor Motor And Front Air Control

      Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

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