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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Engine Control System (DTC/Circuit Diagnosis) (CUMMINS 5.0L) (5 Of 6)) >> DTC/Circuit Diagnosis >> DTC P22A7-00: NOX Sensor Heater Sense Circuit 1/2 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR CURRENT DTC 
    1. Turn ignition switch ON.
    2. Connect CONSULT and check "ENGINE" diagnostic trouble codes.
    3. Check for DTC P22A7-00 being current on the CONSULT screen.

    Is applicable DTC detected?

    YES

    GO TO 2 .

    NO

    GO TO 8 .

  2. CHECK FOR PRIORITY DTC 
    1. Using CONSULT, check for other "ENGINE" diagnostic trouble codes.
    2. Check if any of the following DTCs are "current" or "past":
      • U029E-00
      • P220B-00
      • P229E-00

    Is applicable DTC current or past?

    YES

    Refer to DTC Index .

    NO

    GO TO 3 .

  3. CHECK FOR PRIORITY DTC 
    1. Using CONSULT, check for other "ENGINE" diagnostic trouble codes.
    2. Check if any of the following DTCs are "current":
      • P2481-00
      • P2482-00
      • P2483-00

    Is applicable DTC current?

    YES

    Refer to DTC Index .

    NO

    GO TO 3 .

  4. INSPECT THE OUTLET NOX SENSOR AND CONNECTOR PINS 
    1. Turn ignition switch OFF.
    2. Disconnect the outlet NOx sensor.
    3. Inspect connector for the following:
      • Loose connector.
      • Corroded pins.
      • Bent or broken pins.
      • Pushed back or expanded pins.
      • Moisture in or on the connector.
      • Missing or damaged connector seals.
      • Dirt or debris on or in the connector pins.
      • Connector shell broken.
      • Wire insulation damage.
      • Damaged connector locking tab.

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    • Repair or replace error-detected parts.
    • GO TO 8 .
  5. CHECK THE VOLTAGE TO THE OUTLET NOX SENSOR 
    1. Turn ignition switch ON.
    2. Measure the voltage between the voltage supply circuit and the ground circuit at the outlet NOx sensor harness connector.

    Outlet NOx sensor

    Voltage (V)

    (Approx.)

    Connector

    Terminal (+)

    Terminal (-)

    C33

    4

    3

    Battery voltage

    Is the reading within 1V of battery voltage?

    YES

    • A damaged after treatment outlet NOx sensor heater has been detected. Replace the after treatment outlet NOx sensor. Refer to Removal and Installation .
    • GO TO 8 .

    NO

    GO TO 6 .

  6. CHECK THE BATTERY CONNECTION 
    1. Turn ignition switch OFF.
    2. Check the battery terminals and connections.

    Is the battery connection tight and corrosion-free?

    YES

    GO TO 7 .

    NO

    • Tighten any loose connections and clean the terminals.
    • GO TO 8 .
  7. CHECK outlet NOX SENSOR VOLTAGE SUPPLY CIRCUIT FOR OPEN 

    Measure the voltage between the voltage supply circuit at the outlet NOx sensor harness connector and engine block ground.

    Outlet NOx sensor

    Voltage (V)

    (Approx.)

    Connector

    Terminal (+)

    Terminal (-)

    C33

    4

    Engine block

    Battery voltage

    Is the reading within 1V of battery voltage?

    YES

    • Repair the ground circuit to the outlet NOx sensor for open.
    • GO TO 8 .

    NO

    • Repair the power supply to the outlet NOx sensor for open.
    • GO TO 8 .
  8. ERASE CURRENT DTC 
    1. Turn ignition switch OFF.
    2. Connect all harness connectors.
    3. Turn ignition switch ON.
    4. Using CONSULT erase "ENGINE" diagnostic trouble codes.
    5. Operate the engine within the "Conditions for setting the DTC".
    6. Using CONSULT, check for "ENGINE" diagnostic trouble codes.

    Is P22A7-00 DTC current?

    YES

    Return to Diagnosis Procedure. Refer to Diagnosis Procedure .

    NO

    Repair complete.

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