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

   • Yes: GO TO  6.
   • 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.
   Fig 2: Checking Voltage Between In-Vehicle Sensor Harness Connector Terminal 4 & Ground

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

   Approx. 5V. 

   OK or NG

   • OK: GO TO 3.
   • 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).
   Fig 3: Checking Circuit Continuity Between In-Vehicle Sensor Harness Connector M32 Terminal 1 & Front Air Control Harness Connector M49 Terminal 21
   Courtesy of NISSAN MOTOR CO., U.S.A.
   • Continuity should exist. 

   OK or NG

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

   Refer to "IN-VEHICLE SENSOR ".

   OK or NG

   • OK:
     1. Replace front air control. Refer to "FRONT AIR CONTROL ".
     2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
   • NG:
     1. Replace in-vehicle sensor.
     2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform 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).
      Fig 4: Checking Circuit Continuity Between In-Vehicle Sensor Harness Connector M32 Terminal 4 & Front Air Control Harness Connector M50 Terminal 32

      Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should exist. 
   4. Check continuity between in-vehicle sensor harness connector M32 terminal 4 (BR/W) and ground.

      Continuity should not exist. 

   OK or NG

   • OK:
     1. Replace front air control. Refer to "FRONT AIR CONTROL ".
     2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
   • 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).
      Fig 5: Checking Circuit Continuity Between In-Vehicle Sensor Connector Terminals 2, 3 & Front Air Control Harness Connector M50 Terminals 43, 44

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

   OK or NG

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