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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Heater & Air Conditioning Control System (DTC/Circuit Diagnosis) (Except Hybrid)) >> DTC/Circuit Diagnosis >> DTC B257B, B257C: Ambient Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

  1. CHECK AMBIENT SENSOR POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Disconnect ambient sensor connector.
    3. Turn ignition switch ON.
    4. Check voltage between ambient sensor harness connector and ground.
      + - Voltage
      (Approx.)
      Ambient sensor
      Connector Terminal
      E206 1 Ground 5 V

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    GO TO STEP 4  .

  2. CHECK AMBIENT SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Check continuity between ambient sensor harness connector and ground.
      Ambient sensor - Continuity
      Connector Terminal
      E206 2 Ground Yes

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair harness or connector.

  3. CHECK AMBIENT SENSOR

    Check ambient sensor. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    Replace A/C auto amp. Refer to REMOVAL AND INSTALLATION .

    NO 

    Replace ambient sensor. Refer to REMOVAL AND INSTALLATION .

  4. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR OPEN

    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between ambient sensor harness connector and A/C auto amp. harness connector.
      Ambient sensor A/C auto amp. Continuity
      Connector Terminal Connector Terminal
      E206 1 M50 7 Yes

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair harness or connector.

  5. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT

    Check continuity between ambient sensor harness connector and ground.

    Ambient sensor - Continuity
    Connector Terminal
    E206 1 Ground No

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair harness or connector.

  6. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT

    1. Turn ignition switch ON.
    2. Check voltage between ambient sensor harness connector and ground.
      + - Voltage
      (Approx.)
      Ambient sensor
      Connector Terminal
      E206 1 Ground 0 V

    Is the inspection result normal?

    YES 

    Replace A/C auto amp. Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair harness or connector.

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