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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 501 (Engine Control System (DTC/Circuit Diagnosis) (2 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0420: Three Way Catalyst Function >> Component Function Check

Component Function Check

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM COMPONENT FUNCTION CHECK 

    SYMBOL Without CONSULT

    1. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    4. Let engine idle for 1 minute.
    5. Open engine hood.
    6. Check the voltage between ECM harness connector terminals as per the following condition.

      ECM

      Condition

      Voltage

      Connector

      +

      -

      Terminal

      F54

      41

      35

      Keeping engine speed at 2, 500 rpm constant under no load

      The voltage fluctuation cycle takes more than 5 seconds.

      • 1 cycle: 0.6 - 1.0 -> 0 - 0.3 -> 0.6 - 1.0

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Proceed to Diagnosis Procedure .