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4. CHECK DTC • With the X-431 scan tool, read ECM DTCs. • See ⬙DTC Confirmation Procedure⬙. Is DTC P0645 still present? Yes >> Replace the ECM. NOTE : The Immobilizer control module must be matched to the new ECM (See ECM Removal & Instal- lation in Section 03 Electronic Engine Controls). No >> The system is now operating properly. DIAGNOSIS & TESTING 03
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