LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2017 >> QX80 Base, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC/Circuit Diagnosis >> DTC P0603: ECM >> DTC Logic >> DTC Detection Logic
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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
scientia non olet · About LEMON Manuals