Diagnosis Procedure For Intake Sensor

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. 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: Intake Sensor Circuit

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 M82 terminal 1 and ground.
  1 - Ground : Approx. 5 V
OK or NG

OK: GO TO 2.

NG: GO TO 4.

Fig 2: Checking Voltage Between Intake Sensor Connector Terminal 1 And Ground
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 M82 terminal 2 and unified meter and A/C amp. harness connector M65 terminal 59.
  2 - 59 : Continuity should exist .
OK or NG

OK: GO TO 3.

NG: Repair harness or connector.

Fig 3: Checking Continuity Between Intake Sensor Connector Terminal 2 And Unified Meter And A/C Amp Connector Terminal 59
Courtesy of NISSAN MOTOR CO., U.S.A.
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 M82 terminal 1 and unified meter and A/C amp. harness connector M65 terminal 43.
  1 - 43 : Continuity should exist .
4. Check continuity between intake sensor harness connector M82 terminal 1 and ground.
  1 - Ground : Continuity should not exist .
  
  Fig 4: Checking Continuity Between Intake Sensor Harness Connector Terminal 1 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.