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Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Transfer Case) >> DTC/Circuit Diagnosis >> DTC P1809: Transfer Control Unit >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

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DTC Display item Malfunction detected condition Possible cause
P1809 CONTROL UNIT 4 Malfunction has occurred inside AWD control unit. AD converter system of transfer control unit is malfunctioning.