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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Auto) >> A/C System >> Intake Sensor Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Infiniti I35. 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 the display as a result of conducting Self-diagnosis STEP 2.) 

Fig 1: Identifying Intake Sensor Circuit
G02006844Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND BODY GROUND 

    Disconnect intake sensor harness connector.

    Do approx. 5 volts exist between intake sensor harness terminal No. 1 and body ground?

    Fig 2: Checking Intake Sensor Circuit Between Intake Sensor And Body Ground
    G02006845Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

    1. Yes : GO TO 2.
    2. No : GO TO  4.
  2. CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND AUTO AMP. (LCU) 
    1. Disconnect auto amp. (LCU) harness connector.
    2. Check circuit continuity between intake sensor harness terminal No. 2 and auto amp. (LCU) harness terminal No. 11.
      Fig 3: Checking Intake Sensor Circuit Between Intake Sensor And Auto Amp
      G02006846Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should exist. 

    If OK, check harness for short.

    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
      1. Replace auto amp.
      2. Go to , "FUNCTION CONFIRMATION PROCEDURE ", "Self-diagnosis", and perform SELF-DIAGNOSIS STEP 2.

        Confirm that code No. 20 is displayed.

    2. NG
      1. Replace intake sensor.
      2. Go to , "FUNCTION CONFIRMATION PROCEDURE ", "Self-diagnosis", and perform SELF-DIAGNOSIS STEP 2.

        Confirm that code No. 20 is displayed.

  4. CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND AUTO AMP. (LCU) 
    1. Disconnect auto amp. (LCU) harness connector.
    2. Check circuit continuity between intake sensor harness terminal No. 1 and auto amp. (LCU) harness terminal No. 1.
      Fig 4: Checking Intake Sensor Circuit Between Intake Sensor And Auto Amp
      G02006847Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should exist. 

    If OK, check harness for short.

    OK or NG 

    1. OK
      1. Replace auto amp.
      2. Go to , "FUNCTION CONFIRMATION PROCEDURE ", "Self-diagnosis", and perform SELF-DIAGNOSIS STEP 2.

        Confirm that code No. 20 is displayed.

    2. NG : Repair harness or connector.
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