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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (4 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0420: Three Way Catalyst Function >> Component Function Check

Component Function Check

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM COMPONENT FUNCTION CHECK 

    SYMBOL WITH GST

    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 under the following conditions.

      DTC

      ECM

      Condition

      Voltage

      +

      -

      Connector

      Terminal

      Connector

      Terminal

      P0420

      F79

      84

      [HO2S2 (bank 1)]

      F78

      43

      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

      P0430

      77

      [HO2S2 (bank 2)]

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Go to Diagnosis Procedure .