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Infiniti
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2017
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QX80 Base, AWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System (DTCS) (3 Of 4)
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DTC/Circuit Diagnosis
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DTC P0603: ECM
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DTC Logic
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DTC Detection Logic
DTC Detection Logic
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0603
ECM BACK UP CIRCUIT
[Internal control module keep alive memory (KAM) error]
Malfunction in the internal back up RAM of ECM.
Malfunction in the internal EEP-ROM system of ECM.
ECM power supply
ECM