DTC Detection Logic

WARNING: This page is about a different car, the 2013 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

DTC	CONSULT	Diagnostic item is detected when...
P1819 TRANSFER CONTROL DEVICE	SHIFT ACT CIR	Malfunction is detected in transfer shut off relay 1 and transfer shut off relay 2. Malfunction occurs in transfer control device drive circuit.