Diagnostic Procedure For Intake Sensor

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. 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 display as a result of conducting self-diagnosis.)

Fig 1: Inspecting Intake Sensor

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: Checking Voltage Between Intake Sensor Connector M146 Terminal 2 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.
OK or NG

OK: GO TO 3.

NG: Repair harness or connector.

Fig 3: Checking Continuity Between Intake Sensor Harness Connector M146 Terminal 1 And Connector M49 Terminal 13
CHECK INTAKE SENSOR
Refer to "INTAKE SENSOR ".

OK or NG

OK:
1. Replace front air control. Refer to "FRONT AIR CONTROL ".
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 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 Harness Connector M146 Terminal 2 And Connector M49 Terminal 12
OK or NG

OK:
1. Replace front air control. Refer to "FRONT AIR CONTROL ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
NG: Repair harness or connector.