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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System (DTC/Circuit Diagnosis) (Pr25DD) (3 Of 4)) >> DTC/Circuit Diagnosis >> P1603 ECM >> DTC Diagnosis Procedure >> PR25DD engine

PR25DD engine

WARNING: This page is about a different variant/trim than selected.
  1. INSPECTION START 

    Check that the battery negative terminal is not disconnected during ignition switch ON.

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 2.

  2. ERASE DTC 
    1. Start the engine and let it idle at least 10 seconds.
    2. Turn ignition switch OFF.
    3. Repeat steps 1 and 2 for 4 times.
    4. Erase DTC.
    5. Turn ignition switch OFF and wait at least 10 seconds.
    6. Start the engine and let it idle for 10 seconds.
    7. Check 1st trip DTC.

    Is DTC P1603 detected again?

    YES

    Replace ECM. Refer to Removal & Installation .

    NO

    INSPECTION END

  3. CHECK ECM POWER SUPPLY AND GROUND CIRCUIT 

    Check ECM power supply and ground circuit. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace error-detected parts.

  4. CHECK INTERMITTENT INCIDENT 

    Check intermittent incident. Refer to Inspection .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace error-detected parts.

  5. PERFORM DTC CONFIRMATION PROCEDURE 
    1. Turn ignition switch ON.
    2. Erase DTC.
    3. Perform DTC confirmation procedure. Refer to DTC Description .

    Is the DTC P1603 detected again?

    YES

    Replace ECM. Refer to Removal & Installation .

    NO

    INSPECTION END

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