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Perkins — ECM. If the new software does not rectify the fault,

A Perkins service procedure — check it applies to your exact model before use.

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Procedure

  1. Use the “Copy Configuration” feature on the
  2. Disconnect the suspect ECM. Temporarily connect

Source: manual:cd0c0b.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.