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 To Front Air Control Terminals

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

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

   Approx. 5V 

   OK or NG

   • OK: GO TO 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).
   Fig 3: Checking Circuit Continuity Between Intake Sensor Harness Connector M305 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 3.
   • NG: Repair harness or connector.
3. CHECK INTAKE SENSOR 

   Refer to "INTAKE SENSOR ".

   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:
     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).
      Fig 4: Checking Circuit Continuity Between Intake Sensor Harness Connector M305 Terminal 2 & Front Air Control Harness Connector M49 Terminal 9

      Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should exist. 
   4. Check continuity between intake sensor harness connector M305 terminal 2 (R/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.