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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (1 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0053: A/F Sensor 1 Heater >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC PRIORITY 

    If DTC P0053 is displayed with DTC P0031, P0032 or P0130, first perform the confirmation procedure (trouble diagnosis) for DTC P0031, P0032 or P0130.

    Is DTC P0031, P0032 or P0130 detected?

    YES

    Perform diagnosis of applicable.

    NO

    GO TO 2.

  2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between A/F sensor 1 harness connector and ground.

      A/F sensor 1

      Ground

      Voltage

      Connector

      Terminal

      F44

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • 20 A fuse (No. 53)
    • Harness for open or short between A/F sensor 1 and fuse
    • Loose or poor connection for each connector and harness

    Repair or replace harness or connectors.

  4. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

      A/F sensor 1

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F44

      2

      F79

      116

      Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair open circuit, short to ground or short to power in harness or connectors.

  5. CHECK A/F SENSOR 1 HEATER 

    Refer to Component Inspection (A/F Sensor 1 Heater) .

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    GO TO 6.

  6. REPLACE A/F SENSOR 1 

    Replace malfunctioning A/F sensor 1. Refer to Exploded View .

    CAUTION:
    • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
    • Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).

    INSPECTION END

  7. CHECK INTERMITTENT INCIDENT 

    Perform Intermittent Incident .

    INSPECTION END

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