Diagnostic Procedure For Intake Sensor

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

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.

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.
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 Continuity Between Intake Sensor Harness Connector Terminal 1 & Front Air Control Harness Connector 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.
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.
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 Terminal 2 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.