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DTC Logic

WARNING: This page is about a different car, the 2008 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTION LOGIC CHART

DTC Display contents of CONSULT-III DTC Detection Condition Action to take
U121F INTERNAL COMM [U121F] Internal malfunction of AV control unit (internal communication error) is detected. AV control unit power supply and ground circuit.
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