Diagnosis Procedure For Intake Sensor

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Intake sensor circuit is open or shorted. (24 or -24 is indicated on unified meter and A/C amp. as a result of performing self-diagnosis STEP-2.)

Fig 1: Identifying 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 M254 terminal 2 and ground.
  2 - Ground : Approx. 5 V
  
  Fig 2: Identifying Voltage Between Intake Sensor Harness Connector M254 Terminal 2 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: GO TO 2.

NG: GO TO 4.
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 M254 terminal 1 and unified meter and A/C amp. harness connector M57 terminal 49.
  1 - 49 : Continuity should exist.
  
  Fig 3: Identifying Continuity Between Intake Sensor Connector M254 Terminal 1 And Unified Meter And A/C Amp. Connector M57 Terminal 49
  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. Confirm that code No. 20 is displayed.
NG:
1. Replace intake sensor.
2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
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 M254 terminal 2 and unified meter and A/C amp. harness connector M57 terminal 41.
  2 - 41 : Continuity should exist.
4. Check continuity between intake sensor harness connector M254 terminal 2 and ground.
  2 - Ground : Continuity should not exist.
  
  Fig 4: Identifying Continuity Between Intake Sensor Harness Connector M254 Terminal 2 And Ground
  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. Confirm that code No. 20 is displayed.
NG: Repair harness or connector.