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 Connectors Of 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 

   OK or NG 

   1. OK: GO TO 2
   2. NG: GO TO  4.
      Fig 2: Checking Voltage Between Intake Sensor Harness Connector M305 Terminal 2 (R/W) And Ground

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

   OK or NG 

   1. OK: GO TO 3
   2. NG: Repair harness or connector.
      Fig 3: Checking Continuity Between Intake Sensor Harness Connector M305 Terminal 1 (O/B) And Front Air Control Harness Connector M49 Terminal 21 (O/B)

      Courtesy of NISSAN MOTOR CO., U.S.A.
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 self-diagnosis.
   2. NG :
      1. Replace intake sensor.
      2. Go to self-diagnosis . "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform 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 Continuity Between Intake Sensor Harness Connector M305 Terminal 2 (R/W) And Front Air Control Harness Connector M49 Terminal 9 (R/W)

      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