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Home >> Infiniti >> 2004 >> G35 x >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> 2004.5 - Automatic Air Conditioner - Sedan >> Trouble Diagnosis >> Intake Sensor Circuit >> Diagnostic Procedure For Intake Sensor

Diagnostic Procedure For Intake Sensor

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

Fig 1: Diagnostic Procedure For Intake Sensor
G03327752Courtesy of NISSAN MOTOR CO., U.S.A.
  1. 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 M61 terminal 2 (P/L) and ground.

      2 - Ground: Approx. 5V 

      Fig 2: Checking Voltage Between Intake Sensor And Ground
      G03327753Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: GO TO  4.
  2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND DISPLAY AND A/C AUTO AMP. 
    1. Turn ignition switch OFF.
    2. Disconnect display and A/C auto amp. connector.
    3. Check continuity between intake sensor harness connector M61 terminal 1 (W/G) and display and A/C auto amp. harness connector M31 terminal 11 (W/G).

      1 - 11: Continuity should exist. 

      Fig 3: Checking Circuit Continuity Between Intake Sensor And Display And A/C Auto Amp
      G03327754Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair harness or connector.
  3. CHECK INTAKE SENSOR 

    Refer to "INTAKE SENSOR ".

    OK or NG 

    1. OK: Go to next step.
      1. Replace display and A/C auto amp.
      2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
    2. NG: Go to next step.
      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.
  4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND DISPLAY AND A/C AUTO AMP. 
    1. Turn ignition switch OFF.
    2. Disconnect display and A/C auto amp. connector.
    3. Check continuity between intake sensor harness connector M61 terminal 2 (P/L) and display and A/C auto amp. harness connector M31 terminal 1 (P/L).

      2 - 1: Continuity should exist. 

      Fig 4: Checking Circuit Continuity Between Intake Sensor And Display And A/C Auto Amp
      G03327755Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: Go to next step.
      1. Replace display and A/C auto amp.
      2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
    2. NG: Repair harness or connector.
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