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. Without a CONSULT-II code 56 or 57 is indicated on front air control as a result of conducting self-diagnosis.

Fig 1: Identifying Intake Sensor Circuit Resistance

CHECK VEHICLE EQUIPMENT
Is vehicle equipped with navi?

YES or NO

YES >> GO TO 2.

NO >> GO TO 6.
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 3.

NG >> GO TO 5.

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 4.

NG >> Repair harness or connector.

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

OK or NG

OK >>
1. Replace front air control. Refer to "REMOVAL ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION AND PERFORM SELF-DIAGNOSIS ".
NG >>
1. Replace intake sensor. Refer to "INTAKE SENSOR ".
2. Go to "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 M146 terminal 2 and front air control harness connector M49 terminal 9.
  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 >>
1. Replace front air control. Refer to "REMOVAL ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION AND PERFORM SELF-DIAGNOSIS ".
NG >> Repair harness or connector.

Fig 4: Identifying Circuit Continuity Between Intake Sensor And Front Air Control
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 7.

NG >> GO TO 9.

Fig 5: 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 13.
  1 - 13 : Continuity should exist .
  
  Fig 6: Identifying Circuit Continuity Between Intake Sensor And Front Air Control
OK or NG

OK >> GO TO 8.

NG >> Repair harness or connector.
CHECK INTAKE SENSOR
Check intake sensor. Refer to "INTAKE SENSOR ".

OK or NG

OK >>
1. Replace front air control. Refer to "REMOVAL ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION AND PERFORM SELF-DIAGNOSIS ".
NG >>
1. Replace intake sensor. Refer to "INTAKE SENSOR ".
2. Go to "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 (B) M146 terminal 2 and front air control harness connector (A) 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 .
OK or NG

OK >>
1. Replace front air control. Refer to "REMOVAL ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION AND PERFORM SELF-DIAGNOSIS ".
NG >> Repair harness or connector.

Fig 7: Identifying Circuit Continuity Between Intake Sensor And Front Air Control