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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 P20E9-00: REDUCTANT Pressure Too High >> 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 for existing "ENGINE" diagnostic trouble codes.
    3. Check for DTC P20E9-00 current on the CONSULT screen.

    Is applicable DTC current?

    YES

    GO TO 2 .

    NO

    Refer to Intermittent Incident .

  2. CHECK DEF TANK LEVEL 
    1. Make sure the after treatment DEF tank is not empty and the tank level gauge is accurate.
    2. Using CONSULT check the DEF tank level and compare it to the gauge on the dash.

    DEF tank empty?

    YES

    Fill the DEF tank.

    NO

    GO TO 3 .

  3. CHECK FOR OTHER CURRENT DEF QUALITY DTCS 

    Using CONSULT check ENGINE diagnostic trouble codes for DTCs related to DEF quality.

    Are there any current DTCs related to DEF quality?

    YES

    Go to the appropriate diagnosis procedure. Refer to DTC Index .

    NO

    GO TO 4 .

  4. CHECK FOR OTHER CURRENT DEF DOSING SYSTEM DTCS 

    Using CONSULT check ENGINE diagnostic trouble codes for DTCs related to DEF dosing system.

    Are there any current DTCs related to DEF dosing system?

    YES

    Go to the appropriate diagnosis procedure. Refer to DTC Index .

    NO

    GO TO 5 .

  5. INSPECT DEF SUPPLY PUMP ASSEMBLY, LINES AND FITTINGS 
    1. Turn ignition switch OFF.
    2. Disconnect the after treatment DEF dosing line from the dosing valve.
    3. Disconnect the after treatment DEF dosing line from the DEF tank.
    4. Check the after treatment DEF dosing line for blockage.
    5. Check the dosing unit supply, dosing valve supply, return connectors, and fittings for loose or leaking connections.
    6. Look at both ends of the line to check for signs of buildup or blockage.
    7. Blow compressed shop air through the supply line to establish/confirm free flow.
    8. Check the dosing line for signs of leakage or openings which would allow the dosing unit to suck in air with the DEF.

    DEF dosing line or connections blocked, cracked, or restricted?

    YES

    Repair or replace the dosing line or fittings.

    NO

    GO TO 6 .

  6. PERFORM DEF DOSING UNIT OVERRIDE TEST 
    1. Connect all components and harness connectors.
    2. Remove the after treatment DEF dosing valve from the decomposition tube.
    3. Place the DEF dosing valve in a measuring container having greater than a 1.5 liter [50 oz] capacity.
    4. Turn ignition switch ON.
    5. Using CONSULT, access "ENGINE" and select "DEF Dosing Unit Override Test" active test.

    Did the DEF dosing unit operate according to specifications?

    YES

    GO TO 7 .

    NO

    Replace the DEF supply pump assembly. Refer to Exploded View .

  7. ERASE DTCS 
    1. Turn ignition switch OFF.
    2. Connect all components and harness connectors.
    3. Turn ignition switch ON.
    4. Using CONSULT, select "ENGINE" and erase DTCs.
    5. Operate the engine within the "Conditions for Clearing the DTC".

    Is P20E9-00 DTC current?

    YES

    Diagnosis procedure needs to be repeated. Refer to DTC Description .

    NO

    Repair complete.

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