Diagnostic Procedure For Intake Sensor

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Intake sensor circuit is open or shorted.

LED of A/C switch does not illuminate as a result of performing self-diagnosis STEP-2.

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 M255 terminal 2 (R) and ground.
  - 2 - Ground: Approx. 5V
OK or NG
- OK: GO TO 2.
- NG: GO TO 4.
Fig 2: Intake Sensor Harness Connector M255 Terminal 2 (R) & Ground Continuity Test
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between intake sensor harness connector M255 terminal 1 (W) and unified meter and A/C amp. harness connector M50 terminal 49 (W/L).
  - 1 - 49: Continuity should exist.
  Fig 3: Intake Sensor Harness Connector M255 Terminal 1 (W) & Unified Meter & A/C AMP. Harness Connector M50 Terminal 49 (W/L) Continuity Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 unified meter and A/C amp.
  2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2.
- NG :
  1. Replace intake sensor.
  2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between intake sensor harness connector M255 terminal 2 (R) and unified meter and A/C amp. harness connector M50 terminal 41 (SB).
  - 2-41: Continuity should exist.
4. Check continuity between intake sensor harness connector M255 terminal 2 (R) and ground.
  - 2 - Ground: Continuity should not exist.
  Fig 4: Intake Sensor Harness Connector M255 Terminal 2 (R) & Unified Meter And A/C AMP. Harness Connector M50 Terminal 41 (SB) & Ground Continuity Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK :
  1. Replace unified meter and A/C amp.
  2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2.
- NG: Repair harness or connector.