1997 MERCEDES-BENZ ML320 automatic transmission

Electronic Control Module, Location

Bolted onto the valve housing of shift plate (2a). See Fig. 34
.
Electronic Control Module, Task

To receive various input signals and to convert the control module information into hydraulic functions.
Electronic Control Module, Design

See ELECTRONIC CONTROL MODULE, DESIGN
.
Electronic Control Module, Function

See ELECTRONIC CONTROL MODULE, FUNCTION
.
Electronic Control Module, Design

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 70 © 2006 Mitchell Repair Information Company, LLC.

Fig. 35: Electronic Control Module, Design
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Structure
The electrical control unit (Y3/6) consists of a supporting body made from plastic, in which the electrical
components, RPM sensors 2 and 3 (Y3/6n2, Y3/6n3), the regulating solenoid valves (Y3/6y1, Y3/6y2), the shift
solenoid valves (Y3/6y6), the starter lockout contact (Y3/6s1) and transmission oil temperature sensor (Y3/6b1)
are combined. See Fig. 35
. Conductor tracks integrated into the shell connect the electric components to a plug
connection (11).

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 71 © 2006 Mitchell Repair Information Company, LLC.

The connection to the wiring harness on the vehicle side and the ETC control module (N15/3) is made via this
13-pin connector (11) with a bayonet lock.
With the exception of the solenoid valves, all other electric components are fixed to the conductor tracks.
Electronic Control Module, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 72 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 73 © 2006 Mitchell Repair Information Company, LLC.

Fig. 36: Electronic Control Module, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation
Signals from the ETC control module (N15/3) are conve rted into hydraulic functions in the electric valve
control unit (Y3/6). The RPM sensors (Y3/6n2, Y3/6n3) , the starter lockout contact (Y3/6s1) and the
transmission oil temperature sensor (Y3/6b1) of the electrical cont rol unit (Y3/6) supply the ETC control
module (N15/3) with input signals. The solenoid valves are controlled by the ETC control module (N15/3) and
trigger the hydraulic functions. See Fig. 36
.
Location/Task/Design/Function Of Freewheel
Fig. 37: Function Of Freewheel
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Freewheel Location

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 74 © 2006 Mitchell Repair Information Company, LLC.

In the front planetary gear set a freewheel (F1, F2) is installed between the front sun gear (V1) and the
stator shaft (8) and in the rear planetary gearset between the rear sun gear (H1) and the intermediate shaft
(3). See Fig. 37
.
Freewheel Task

Optimizes individual gearshifts. Support of the individual elements of a planetary gear set against each
other or against the transmission housing in one direction of rotation in order to permit torque
transmission.
Freewheel Design

The freewheels (F1, F2) consist of an outer race (12), an inner race (13), a number of clamping bodies
(14) and a clamping body cage (15).
Freewheel Function

See FREEWHEEL, FUNCTION
.
Freewheel, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 75 © 2006 Mitchell Repair Information Company, LLC.

Fig. 38: Freewheel Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 76 © 2006 Mitchell Repair Information Company, LLC.

Operation - If the inner race (13) of the freewheel is locked and the outer race (12) turns in direction "A" , the
locking elements (14) adopt a diagonal position on account of their special contours, allowing the freewheel
function. See Fig. 38
. The outer race (12) slides over the locking elements (14) with negligible friction. If the
rotation of the outer race (12) changes to direction "B", the locking elements (14) stand up and lock the outer
and inner races (12, 13) together.
Transmission Housing Breathing, Location/Task
Fig. 39: Transmission Housing Breather, Location/Task
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 77 © 2006 Mitchell Repair Information Company, LLC.