8.2. Transfer case
The transfer case is installed behind the power unit. The torque of the engine is transmitted through transmission and the transfer case on lobbies and back driving shaft / half shafts by means of driveshafts.
On a design and the principle of action the transfer case used on the Infiniti QX4 models belongs to full-regime (All-mode) with electronic and hydraulic management — see the following illustrations:
The module of management of automatic transmission (TCM) acts as the think-tank. Failures of the system of 4WD are fixed in memory of the module of management and there can be schitana by means of the CONSULT scanner, or on signals of a control lamp. Failure diagnostics of AT and system 4WD has to be made in the conditions of a workshop of car service.
Authors of the present manual do not recommend to motorists to make in house conditions of attempt of independent performance of recovery repair of the failed transfer case. Work demands existence of special tools and a certain qualification of the performer. Nevertheless, independent performing procedures of removal and installation of the transfer case which description is provided further will allow in an essential measure to cut down the expenses connected both with repair, and with replacement of the failed assembly.
Schematic diagram of functioning of a control system of AT/4WD
Basic principles of functioning of the transfer case
Function chart of a hydraulic contour of management of system 4WD
Function chart of a control system of 4WD