Diagnostic Procedure For Intake Sensor

WARNING: This page is about a different car, the 2005 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Intake sensor circuit is open or shorted.

Fig 1: Intake Sensor Circuit Diagram

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

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 M146 terminal 2 and ground.
  2 - Ground: Approx. 5V
OK or NG
1. OK: GO TO 2.
2. NG: GO TO 4.
  
  Fig 2: Checking Voltage Between Intake Sensor Connector Terminal 2 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 M146 terminal 1 and front air control harness connector M49 terminal 13.
  1 - 13: Continuity should exist.
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connector.
  
  Fig 3: Checking Continuity Between Terminal 1 And Terminal 13
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTAKE SENSOR
Check the intake sensor. Refer to "INTAKE SENSOR ".

OK or NG
1. OK: Replace front air control. Refer to "FRONT AIR CONTROL ".
2. NG: Replace intake sensor. Refer to "INTAKE SENSOR ".
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 M146 terminal 2 and front air control harness connector M49 terminal 12.
  2 - 12: Continuity should exist.
4. Check continuity between intake sensor harness connector M146 terminal 2 and ground.
  2 - Ground: Continuity should not exist.
  
  Fig 4: Checking Continuity Between Terminal 2 And Terminal 12
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Replace front air control. Refer to "FRONT AIR CONTROL ".
2. NG: Repair harness or connector.