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Engine Control System - DTCS P0190 To P1084
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DTC P0603: ECM Power Supply
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DTC Logic
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DTC Detection Logic
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DTC Detection Logic
DTC No.
Trouble diagnosis name (Trouble diagnosis content)
DTC detecting condition
Possible cause
P0603
ECM BACK UP/CIRCUIT (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