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Diagnostic Procedure For Optical Sensor

WARNING: This page is about a different car, the 2006 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Optical sensor circuit is open or shorted. Using the CONSULT-II, DTC B257F or B2580 is displayed. Without a CONSULT- II code 50 or 52 is indicated on front air control as a result of conducting self-diagnosis.

Fig 1: Optical Sensor - Communication Diagram
G04746408
  1. CHECK VEHICLE EQUIPMENT 

    Is vehicle equipped with navi?

    YES or NO 

    YES >> GO TO 2.

    NO >> GO TO  4.

  2. CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector and optical sensor connector.
    3. Check continuity between optical sensor harness connector M402 terminal 1 and 2 and front air control harness connector M50 terminal 31 and 40.

      1 - 31 : Continuity should exist  .

      2 - 40 : Continuity should exist  .

    4. Check continuity between optical sensor harness connector M402 terminal 1 and 2 and ground.

      1, 2 - Ground. : Continuity should not exist  .

    OK or NG 

    OK >> GO TO 3.

    NG >> Repair harness or connector.

    Fig 2: Identifying Circuit Continuity Between Optical Sensor And Front Air Control
    G04746409
  3. CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM 
    1. Disconnect BCM connector.
    2. Check continuity between optical sensor harness connector (B) M402 terminal 3 and BCM harness connector (A) M18 terminal 18.

      3 - 18 : Continuity should exist  .

    3. Check continuity between optical sensor harness connector (A) M402 terminal 3 and ground.

      3 - Ground : Continuity should not exist  .

    OK or NG 

    OK >> Replace optical sensor. Refer to "OPTICAL SENSOR ".

    NG >> Repair harness or connector.

    Fig 3: Identifying Circuit Continuity Between Optical Sensor And BCM
    G04746410
  4. CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL 
    1. Turn ignition switch OFF.
    2. Disconnect front air control connector and optical sensor connector.
    3. Check continuity between optical sensor harness connector (B) M402 terminal 1 and 2 and front air control harness connector (A) M50 terminal 37 and 29.

      1 - 37 : Continuity should exist  .

      2 - 29 : Continuity should exist  .

    4. Check continuity between optical sensor harness connector M402 terminal 1 and 2 and ground.

      1, 2 - Ground. : Continuity should not exist  .

    OK or NG 

    OK >> GO TO 5.

    NG >> Repair harness or connector.

    Fig 4: Identifying Circuit Continuity Between Optical Sensor And Front Air Control
    G04746411
  5. CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM 
    1. Disconnect BCM connector.
    2. Check continuity between optical sensor harness connector (B) M402 terminal 3 and BCM harness connector (A) M18 terminal 18.

      3 - 18 : Continuity should exist  .

    3. Check continuity between optical sensor harness connector (A) M402 terminal 3 and ground.

      3 - Ground : Continuity should not exist  .

    OK or NG 

    OK >> Replace optical sensor. Refer to "OPTICAL SENSOR ".

    NG >> Repair harness or connector.

    Fig 5: Identifying Circuit Continuity Between Optical Sensor And BCM
    G04746412
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