Nissan Micra K11 silhouetteK11

TROUBLE DIAGNOSES - Diagnostic Procedure

EF & EC-53prose procedure
Continued from EF & EC-52

Diagnostic Procedure

  1. 1
    Before connecting or disconnecting the E.C.U. harness connector to or from any E.C.U., be sure to turn the ignition switch to the "OFF" position and disconnect the negative battery terminal in order not to damage E.C.U. as battery voltage is applied to E.C.U. even if ignition switch is turned off. Failure to do so may damage the E.C.U.
    Illustration of a vehicle battery with the negative terminal cable being disconnected, with an arrow indicating the lifting motion.
    SEF289H
  2. 2
    When connecting E.C.U. harness connector, tighten securing bolt until red projection is in line with connector face.
    Illustration of an E.C.U. harness connector showing the Red projection and Protector locations on the connector.
    SEF725H
  3. 3
    When connecting or disconnecting pin connectors into or from E.C.U., take care not to damage pin terminals (bend or break).
    Illustration of an ECU with pin terminals shown; insets show pin terminals correctly bent and incorrectly broken.
    SEF291H
  4. 4
    Make sure that there are not any bends or breaks on E.C.U. pin terminal, when connecting pin connectors.
  5. 5
    Before replacing E.C.U., perform E.C.U. input/output signal inspection and make sure that the new E.C.U. functions properly.
    Illustration of two E.C.U. units (OLD ONE and a new one) with a speech bubble: 'Perform E.C.U. input/output signal inspection before replacement.'
    SEF330D
  6. 6
    After performing this "Diagnostic Procedure", perform E.C.C.S. self-diagnosis and driving test.
    Illustration of an E.C.U. with a callout showing the Red L.E.D. indicator location.
    UEF115
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