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Nissan Sentra B18 (2020-2025) Service Manual: Power Supply and Ground Circuit. Diagnosis Procedure

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    1. Check that the following fuse is not blown:

      Signal name

      Fuse No.

      Capacity

      Ignition power supply

      49

      10 A

    Is the fuse blown?

    YES >>

    Replace the blown fuse after repairing the affected circuit.

    NO >>

    GO TO 2.

  2. CHECK FUSIBLE LINK

    1. Check that the following fusible link is not blown:

      Signal name

      Fusible link No.

      Capacity

      Battery

      H

      80 A

    Is the fusible link blown?

    YES >>

    Replace the blown fusible link after repairing the affected circuit.

    NO >>

    GO TO 3.

  3. POWER SUPPLY CIRCUIT CHECK

      1. Disconnect EPS control unit connector.

      2. Check voltage between EPS control unit harness connector and ground.

      (+)

      (—)

      Ignition switch position

      EPS control unit

      Connector

      Terminal

      OFF

      ON

      START

      E74

      7

      Ground

      Battery voltage

      Battery voltage

      Battery voltage

      E73

      4

      0 V

      Battery voltage

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace harness or connector.

  4. GROUND CIRCUIT CHECK

      1. Ignition switch OFF.

      2. Check continuity between EPS control unit harness connector and ground.

      EPS control unit

      —

      Continuity

      Connector

      Terminal

      E74

      8

      Ground

      Yes

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Repair or replace harness or connectors.

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