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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 P204C-00: REDUCTANT Pressure Sensor Circuit Low >> 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 DTC PRIORITY 
    1. Turn ignition switch ON.
    2. Connect CONSULT and check for other existing "ENGINE" diagnostic trouble codes.

    If DTC P21CA is present, perform the confirmation procedure (trouble diagnosis) for this other DTC first.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable DTC. Refer to DTC Description .

    NO

    GO TO 2 .

  2. CHECK FOR CURRENT DEF PRESSURE SENSOR DTC 

    Check for DTC P204C current on the CONSULT screen.

    Is applicable DTC current?

    YES

    GO TO 3 .

    NO

    Refer to Intermittent Incident .

  3. INSPECT DEF SUPPLY PUMP ASSEMBLY AND ELECTRICAL CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Disconnect the DEF supply pump assembly connector.
    3. Inspect connector and pins 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 4 .

    NO

    Repair or replace error-detected parts.

  4. CHECK DEF PRESSURE SENSOR POWER SUPPLY CIRCUITS 
    1. Turn ignition switch ON.
    2. Check the voltage between DEF supply pump assembly connector sensor supply voltage and return circuit terminals.

      DEF supply pump assembly

      Voltage (V)

      (Approx.)

      Connector

      Terminal (+)

      Terminal (-)

      C204

      13

      11

      Approx. 5

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    GO TO 7 .

  5. CHECK THE CIRCUIT RESPONSE 
    1. Turn ignition switch OFF.
    2. Connect a jumper wire between DEF supply pump assembly 5V supply terminal 13 and signal circuit terminal 12.
    3. Turn ignition switch ON and wait 30 seconds.
    4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.

    Did DTC P204D become current and P204C become past?

    YES

    GO TO 6 .

    NO

    GO TO 7 .

  6. CHECK THE CIRCUIT RESPONSE 
    1. Turn ignition switch OFF.
    2. Disconnect the jumper wire.
    3. Reconnect the DEF supply pump assembly connector.
    4. Turn ignition switch ON and wait 30 seconds.
    5. Connect CONSULT and check for current ENGINE diagnostic trouble codes.

    Did P203C DTC become current?

    YES

    A damaged tank level sensor has been detected. Replace the after treatment DEF supply pump assembly. Refer to Exploded View .

    NO

    The removal and installation of the connector corrected the issue. Repair complete.

  7. INSPECT DEF CONTROL MODULE AND ELECTRICAL CONNECTIONS 
    1. Disconnect the DEF control module.
    2. Inspect both connectors and pins 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 8 .

    NO

    Repair or replace error-detected parts.

  8. CHECK TANK PRESSURE SENSOR POWER CIRCUIT FOR OPEN 

    Check the 5 volt power circuit for continuity between the DEF control module and the DEF supply pump assembly.

    DEF control module

    DEF supply pump assembly

    Continuity

    Connector

    Terminal

    Connector

    Terminal

    C205

    27

    C204

    13

    Yes

    Is the inspection result normal?

    YES

    GO TO 9 .

    NO

    Repair open circuit in harness or connectors.

  9. CHECK TANK PRESSURE SENSOR SIGNAL CIRCUIT FOR OPEN 

    Check the signal circuit for continuity between the DEF control module and the DEF supply pump assembly.

    DEF control module

    DEF supply pump assembly

    Continuity

    Connector

    Terminal

    Connector

    Terminal

    C205

    25

    C204

    12

    Yes

    Is the inspection result normal?

    YES

    GO TO 10 .

    NO

    Repair open circuit in harness or connectors.

  10. CHECK TANK PRESSURE SENSOR SIGNAL CIRCUIT FOR SHORT TO OTHER CIRCUITS 

    Check the continuity between DEF tank pressure sensor signal and all other circuits at the DEF control module harness connector.

    DEF control module

    Continuity

    Connector

    Terminal

    Terminal

    C205

    25

    All others

    No

    Is the inspection result normal?

    YES

    GO TO 11 .

    NO

    Repair short circuit in harness or connectors.

  11. CHECK TANK PRESSURE SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND 

    Check the continuity between DEF tank pressure sensor signal circuit and ground.

    DEF control module

    Ground

    Continuity

    Connector

    Terminal

    C205

    25

    -

    No

    Is the inspection result normal?

    YES

    GO TO 12 .

    NO

    Repair or replace harness for a short to ground.

  12. CHECK FOR CURRENT DTC 
    1. Connect all harness connectors.
    2. Turn ignition switch ON and wait 30 seconds.
    3. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.

    Is P204C DTC current?

    YES

    Replace DEF control module. Refer to Exploded View .

    NO

    The removal and installation of the connector corrected the issue.

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