Diagnostic Procedure For Intake Sensor

SYMPTOM: Intake sensor circuit is open or shorted. (56 or 57 is indicated on front air control as a result of conducting Self-diagnosis).

Fig 1: Connecting Intake Sensor Between Front Air Control

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

1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND 
   1. Disconnect intake sensor connector.
   2. Turn ignition switch ON.
   3. Check voltage between intake sensor harness connector M305 terminal 2 (R/W) and ground.

      Approx. 5V 

      Fig 2: Checking Voltage Between Intake Sensor Harness Connector Terminal And Ground

      Courtesy 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 INTAKE SENSOR AND FRONT AIR CONTROL 
   1. Turn ignition switch OFF.
   2. Disconnect front air control connector.
   3. Check continuity between intake sensor harness connector M305 terminal 1 (O/B) and front air control harness connector M49 terminal 21 (O/B).

      Continuity should exist. 

      Fig 3: Checking Circuit Continuity Between Intake Sensor And Front Air Control

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

   OK or NG 

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

   Refer to "INTAKE SENSOR ".

   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
      1. Replace intake sensor.
      2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform the self-diagnosis.
4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL 
   1. Turn ignition switch OFF.
   2. Disconnect front air control connector.
   3. Check continuity between intake sensor harness connector M305 terminal 2 (R/W) and front air control harness connector M49 terminal 9 (R/W).

      Continuity should exist. 

   4. Check continuity between intake sensor harness connector M305 terminal 2 (R/W) and ground.

      Continuity should not exist. 

      Fig 4: Checking Circuit Continuity Between Intake 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.