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Diagnostic Procedure 1. CHECK DTC • Perform DTC confirmation procedure. Is DTC P0604, P0605 or P0606 present? Yes >> Go to the next step. No >> The DTC condition is intermittent (See Diagnostic Help in Section 03 Electronic Engine Controls). 2. CHECK ECM POWER SUPPLY AND GROUND • Check if the ECM supply voltage circuit, ground circuit open, high resistance or short circuits existing. Is the check result normal? Yes >> Go to the next step. No >> Repair or replace circuit for open or short in harness and connectors. 3. CHECK DTC • With the X-431 scan tool, read ECM DTCs. • Refer to ⬙DTC Confirmation Procedure⬙. Is the check result normal? Yes >> The system is now operating properly. No >> 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). DIAGNOSIS & TESTING 03
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