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DTC Detection Logic

WARNING: This page is about a different car, the 2008 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTING CONDITION AND POSSIBLE CAUSE REFERENCE

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0603 ECM power supply circuit ECM back-up RAM system does not function properly.
  • Harness or connectors [ECM power supply (back-up) circuit is open or shorted.]
  • ECM
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