Diagnostic Procedure For Intake Sensor

WARNING: This page is about a different car, the 2006 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Intake sensor circuit is open or shorted. Using the CONSULT-II, DTC B2581 or B2582 is displayed.

Fig 1: Intake Sensor Circuit Diagram

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

OK : GO TO 2.

NG : GO TO 4.

Fig 2: Identifying Voltage Between Intake Sensor And Ground
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 21.
  1 - 21 : Continuity should exist.
OK or NG

OK : GO TO 3.

NG : Repair harness or connector as necessary.

Fig 3: Identifying Circuit Continuity Between Intake Sensor And Front Air Control
CHECK INTAKE SENSOR
Check intake sensor. Refer to "INTAKE SENSOR CIRCUIT ".

OK or NG

OK : Replace front air control. Refer to "CONTROL UNIT ".

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 9.
  
  Fig 4: Identifying Circuit Continuity Between Intake Sensor And Front Air Control
  
  2 - 9 : Continuity should exist.
4. Check continuity between intake sensor harness connector M146 terminal 2 and ground.
  2 - Ground : Continuity should not exist.
OK or NG

OK : Replace front air control. Refer to "CONTROL UNIT ".

NG : Repair harness or connector as necessary.