Mercedes-Benz ML320. Manual — part 208

position "P" by simultaneously operating the lock lever.

Location/Task/Design/Function Of R/P Lock

See LOCATION/TASK/DESIGN/FUNCTION OF R/P LOCK.

Parking Lock, Location/Task/Design/Function

See PARK PAWL, LOCATION/TASK/DESIGN/FUNCTION.

Function Of Torque Converter Lockup Clutch Control

Operation

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

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Fig. 165: Function Of Torque Converter Lockup Clutch Control
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

The aim of using the torque converter lockup clutch is to reduce the fuel consumption and exhaust gas
emissions of the vehicle by reducing torque converter slip. See Fig. 165. This stands in contradiction to the ride
comfort demands made on the drive train with regard to its vibration behavior. The task of the electronic
transmission control is therefore to close to the clutch in all driving situations relevant to fuel consumption, if
possible, and ensure that the engine vibrations are isolated from the drive train.

The characteristic curves shown in the diagram illustrate the different operating states of the torque converter
lockup clutch in relation to the accelerator pedal position and transmission output speed, plotted for one
transmission gear.

In addition to the evaluation of these characteristics, the status of the torque converter lockup clutch is also
determined by other variables.

Variables influencing the states of the torque converter lockup clutch:



Accelerator Pedal Movement



Uphill And Down Hill Gradients



Transmission Shift Functions



ATF Temperature



Durability Requirements



Load Condition



Engine Control Influences

Torque Converter Lockup Clutch Control Pressure, Function

See TORQUE CONVERTER LOCKUP CLUTCH CONTROL PRESSURE, FUNCTION.

REMOVE/INSTALL TRANSFER CASE

Remove/Install

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

Fig. 166: Removing & Installing Transfer Case
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

1.1 - Remove noise encapsulation. See REMOVE/INSTALL NOISE ENCAPSULATION.

2 - Unscrew exhaust bracket (9) and exhaust bracket (10) to exhaust. See Fig. 166.

3 - Unscrew bolts (14) and remove propeller shaft (13) from transfer case.

4 - Unscrew bolts (12) and remove propeller shaft (11) from transfer case.

NOTE:

Model 163.113/128
Only remove rear section of noise encapsulation.

NOTE:

Hang up propeller shaft to one side and ensure that the universal joint and
center bearing are not damaged.
Self-locking screw for front propeller shaft on transfer case (rear axle
side). See Torque Specifications; Driveshaft.

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me