270-1
270 Transfer Case
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270-1 TRANSFER CASE SERVICE . . . . . . . . . . . . . . 270-3 Transfer case fluid service . . . . . . . . . . . . . . . . 270-4 Transfer case servomotor, servomotor, replacing . . . . . . . . 270-5 Transfer case, case, removing removing and installing . . . . . . 270-6 0 7 2
GENERAL This repair group covers the all-wheel drive transfer case. Internal transfer case repair is not covered. The ATC 400 xDrive transfer case, bolted to the rear of the transmission, directs power from the transmission to both the front and rear differentials via driveshafts. 1.
Servomotor with position sensor
2.
Classification resistor
3.
Fastener tighten to 22 Nm (16 ft-lb)
4.
Drain / fill plug sealing washer
5.
Drain / fill plug tighten to 33 Nm (24 ft-lb)
xDrive includes active torque control (ATC). (ATC). ATC ATC uses electronics via the VTG control module to control torque split and traction via a multidisc clutch.
VTG (transfer case) control module (A70006) on rear floor panel under luggage compartment trim ahead of battery, passenger side. For VTG ground and power supplies, see ELE Electrical Wiring Diagrams. Diagrams. Additional information can also be found in 260 Driveshafts. Driveshafts.
270-2
Transfer Case When the multidisc clutch is open, no driving torque is transmitted to the front axle; instead, the entire driving torque is directed to the rear differential. When the clutch is fully closed, the front and rear axles turn at the same speed. 1.
Multidisc clutch
2.
Rear driveshaft
3.
Adjusting levers with ball ramp
4.
Cam disc (driven by servomotor)
5.
Front driveshaft
6.
Drive (power transfer) chain
The VTG servomotor actuates the multidisc clutch via the cam disc and adjusting levers.
Underneath vehicle at transfer case: M8533: xDrive (VTG) ser vomotor • R8554: Classification resistor
Transfer Case
270-3
TRANSFER CASE SERVICE The adaptive xDrive transfer case oil wear is monitored by the transfer case (VTG) control module to determine when an oil change is due. After changing worn transfer case oil, a BMW scan tool should be used to reset transfer case wear adaptations if “54C6 - VTG: Oil wear” fault code is present (including an illuminated 4 x 4 inactive warning lamp). If the following xDrive dr iveline conditions/faults are present: • Drivetrain vibrations, juddering and /or humming noises when traveling at speeds of 50 mph or more (particularly noticeable when coasting);
0 7 • Grabbing/juddering or chattering condition under hard acceleration 2 in low gears; • Vibrations when driving through turns at low speeds. First check that tires are the same (brand, size, wear/ condition) at all four corners. Next disconnect the harness connector at the VTG ser vomotor and test drive vehicle. If the issue is no longer present, change the transfer case fluid and reset the wear values in the VTG control module using a BMW factory scan tool. If problems persist with new oil and a reset, the issue is likely related to the activation of the clutch in the VTG transfer case and additional transfer case diagnosis and service is required. If the ABS, BRAKE and 4x4 inactive instrument panel warning lights are simultaneously illuminated and/or the transfer case actuator makes a clicking sound after shutting the engine off, the VTG servomotor is likely faulty. The cause of this fault can often be traced to a worn or cracked composite gear (arrow) within the servomotor housing. BMW does not sell the gear separately, although an aftermarket gear is available.
Gear (arrow) replacement requires removal and disassembly of the servomotor.
270-4
Transfer Case
Transfer case fluid service
Transfer case fluid service After performing work on transfer case, check fluid level. Be sure to use correct specification fluid. CAUTION —
To prevent damaging transfer case, use only the recommended fluid.
–
Raise vehicle and support safely. WARNING —
• Make sure vehicle is stable and well supported at all times. Use a professional automotive lift or jack stands. A floor j ack is not adequate support.
Remove fill plug (1). Remove drain plug (2) and drain transfer case.
–
Install and tighten drain plug using new sealing washer.
Using fluid pump, fill transfer case until fluid begins to drip from lower edge of filler plug (1). Install and tighten fill plug using new sealing washer.
If necessary, reset transfer case wear adaptations using a BMW scan tool and clear fault memory. Transfer case fluid Capacity • drain and fill • refill Specification
0.69 ltr (0.73 qt) 0.80 ltr (0.85 qt) Transfer case oil TF0870 BMW part no. 83 22 0 397 244
Tightening torque Drain / fill plug to transfer case (M18)
33 Nm (24 ft-lb)
established 1950 Automotive Reference™
BentleyPublishers .com
BMW X3 (E83) Service Manual: 2004-2010 2.5i, 3.0i, 3.0si, xDrive 30i Bentley Stock Number: BX30 Publication Date: 2015.01.26 ISBN: 978-0-8376-1731-2 Hardcover, 8 3/8 in. x 11 in. Case quantity: 5 1,066 pages, 1,884 photos, illustrations and diagrams
The BMW X3 (E83) Service Manual: 2004-2010 is a comprehensive source of service information and specifications for the BMW X3 from 2004 to 2010. The aim throughout this manual has been simplicity, clarity and completeness, with practical explanations, step-by-step procedures and accurate specifications. W hether you’re a professional or a do-it-yourself BMW owner, this manual will help you understand, care for and repair your car.
Learn how to change the transfer case fluid and reset xDrive transfer case adaptations. 270 Transfer Case
Features: • Maintenance procedures from changing the xDrive uids to replacing the cabin microfilter. This manual tells you what to do and how and when to do it. • Manual and automatic transmission uid service, front and rear differential service, including xDrive transfer case troubleshooting. • Step-by-step variable camshaft timing (VANOS) service. • Cylinder head cover gasket and crankshaft seal replacement. • Cooling system, thermostat and radiator service, including system bleeding using the electric coolant pump on N52 engines. • Fuel injection and ignition system diagrams and explanations. • Information on advanced technical features such as VANOS, Valvetronic, xDrive, and DSC (dynamic stability control). • Suspension repair procedures. • Brakes, steering and ABS troubleshooting and repair. • Heating and air-conditioning repair, including A/C component replacement. • Body and hood repairs and adjustments. • Electrical system service, with an easy-to-use illustrated component locator section. • Comprehensive wiring schematics, including fuses and grounds. • BMW OBD II diagnostic trouble codes, SAE-dened OBD II P-codes, as well as basic scan tool operation. • BMW factory tolerances, wear limits, adjustments and tightening torques.
Step-by-step procedures for replacing the crankcase vent valve. 130 Fuel Injection (M54 Engine)
Extensive electrical component location information. ECL Electrical Component Locations
Engines covered:
M54 engine: 2.5i, 3.0i (2004–2006) N52 engine: 3.0si, xDrive 30i (2007–2010) Transmissions covered (remove, install, external service): Manual:
ZF GS6-37BZ (6-speed)
Automatic:
GM A5S390R (5-speed) GM GA6L45R (6-speed)
Bentley Publishers, 1734 Massachusetts Avenue, Cambridge, MA 02138-180 4 USA Tel: 617-547-4170 • Toll Free: 800-423-45 95 • Fax: 617-876-9235 http://www.bentleypublishers.com/contact-us bentley_bx30_new.product.announcement.pdf
