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Nissan Sentra B18 (2020-2025) Service Manual: P1603 Ecm

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P1603

CONTROL MODULE

(CONTROL MODULE)

Diagnosis condition

Signal (terminal)

Threshold

EEPROM (built-in microcomputer) system internal ECM does not function properly

Diagnosis delay time

POSSIBLE CAUSE

  • ECM

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

  1. PRECONDITIONING

    Perform the following procedure before performing DTC Confirmation Procedure.

    1. Turn ignition switch OFF and wait at least 10 seconds.

    2. Turn ignition switch ON.

    3. Turn ignition switch OFF and wait at least 10 seconds.

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE

    1. Start the engine and wait at least 10 seconds.

    2. Turn ignition switch OFF and wait at least 10 seconds.

    3. Repeat steps 1 and 2 for 4 times.

    4. Turn ignition switch ON.

    5. Erase DTC.

    6. Turn ignition switch OFF and wait at least 10 seconds.

    7. Start the engine and wait for 10 seconds.

    8. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO-2 >>

    Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  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 Intermittent Incident.

    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 Confirmation Procedure.

    Is the DTC P1603 detected again?

    YES >>

    Replace ECM. Refer to Removal & Installation.

    NO >>

    INSPECTION END

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