1997 MERCEDES-BENZ ML320 air condition

Fig. 95: ETC Control Module, Location
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Location - The ETC control module (N15/3) is installed in the left footwell, on the heater/air conditioning
housing. See Fig. 95
.
ETC Control Unit, Task
Transmission 722.6 in model 163 with touch shift

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:27 PMPage 162 © 2006 Mitchell Repair Information Company, LLC.

Task - The ETC control module (N15/3) determines the instantaneous operating condition of the vehicle and
controls all gearshift sequences taking into account the ease of shifting and the driving situation. This involves
receiving, converting and transmitting various digital and analog signals. See Fig. 96
.
It receives operating data in the form of input signals from:
Starter Lock-Out Contact (Y3/6S1)
RPM Sensor 2 (Y3/6N2)
RPM Sensor 3 (Y3/6n3)
Transmission Oil Temperature Sensor (Y3/6B1)
In addition there is a connection via the engine compartment bus to the:
Instrument Cluster (A1)
ME-SFI Control Module (N3/10) or CDI Control Module (N3/9)
The solenoid valves for the modulating and shift pressure and for the gear changes are actuated by the ETC
control module (N15/3).
The pressure required is calculated from all input signals, adjusted to the torque to be transferred. The following
information from other systems is then processed.
ME-SFI Control Module (N3/10) or CDI Control Module (N3/9):
Engine Torque
Engine Speed
Accelerator Pedal Position
Gear Shift
Engine Status
Electronic Selector Lever Module Control Module (N15/5):
Kickdown Switch (S16/6)
Selector Lever Position P/N
Traction System Control Module (N47):
Transmission Ratio
Speeds
Instrument Cluster (A1):
Selector Lever Position/Shift Range

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 164 © 2006 Mitchell Repair Information Company, LLC.

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Task - The ETC control module (N15/3) determines the instantaneous operating condition for the vehicle and
controls all gearshift sequences taking into account the ease of shifting and the driving situation. See Fig. 97
.
This involves receiving , converting and transmitting various digital and analog signals.
Input signals:
Starter Lock-Out Contact (Y3/6S1)
RPM Sensor 2 (Y3/6N2)
RPM Sensor 3 (Y3/6N3)
Transmission Oil Temperature Sensor (Y3/6B1)
Kickdown Switch (S16/6)
Gear Recognition Switch (S16/10)
Output signals:
Reverse/parking lock valve
Input and output signals:
Datalink connector (X11/4)
In addition there is a connection via the engine compartment bus to the:
ME-SFI Control Module (N3/10) or CDI Control Module (N3/9)
Traction System Control Module (N47)
Transfer Case Control Module (N78)
The solenoid valves for the modulating and shift pressure and for the gear changes are actuated by the ETC
control module (N15/3). The pressure required is calculated from all input signals, adjusted to the torque to be
transferred.
The following information from other systems is then processed:
ME-SFI Control Module (N3/10) or CDI Control Module (N3/9)
(Y66/1)
Selector lever position P/N to the engine control module (ME-SFI) (N3/10) (only on detection of the
selector lever position "P" or "N" on the transmission range recognition switch (S16/10) and at the starter
interlock contact (Y3/6s1)).
Traction system control module (N47):
Wheel speeds

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 166 © 2006 Mitchell Repair Information Company, LLC.

Location/Task/Design/Function Of Freewheel

See LOCATION/TASK/DESIGN/FUNCTION OF FREEWHEEL
.
Function Of Gear Shift (With Touch Shift)
Transmission with touch shift.
On transmission 722.6 the electrohydraulic control unit converts the electric signals going out from the
electronic transmission control (EGS) into hydraulic signals.
Faults occurring in the ETC control unit (N15/3) are handled by the limp-home system. The limp-home system
is designed so that the driver can reach a Service Operation even under extreme conditions.
Selector lever position "P", "R", "N" and "D" are transmitted by the electronic selector lever module control unit
(N15/5) on the Controller Area Network bus class C (engine compartment) (CAN-C) and in parallel to this by
means of a shift rod to the range selector lever at the transmission end. By touching or holding the selector lever
towards "+" or "-" the shift range is pre-selected and displayed in the instrument cluster (A1) until an upshift of
transmission 722.6 is possible.
Function Of Gear Change

See FUNCTION OF GEAR CHANGE
.
Emergency Default Mode, Function

See LIMP
-HOME MODE, FUNCTION.
Function Of Manual Drive Mode Selection

Oil Level Control, Function

See OIL LEVEL CONTROL, FUNCTION
.
Torque Converter Lockup Clutch Control, Function

See FUNCTION OF TORQUE CONVERTER LOCKUP CLUTCH CONTROL
.
Function Of Gear Shift (Without Touch Shift)
On transmission 722.6 the electrohydraulic control unit converts the electric signals going out from the
electronic transmission control (EGS) into hydraulic signals.
Faults occurring in the ETC control unit (N15/3) are handled by the limp-home system. The limp-home system
is designed so that the driver can reach a Service Operation even under extreme conditions.
Selector lever position "P", "R", "N" and "D" are transmitted by the electronic selector lever module control unit

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:28 PMPage 224 © 2006 Mitchell Repair Information Company, LLC.

When the multiple-disc brake (B) is engaged, the working pressure (p-A) is applied to the end face of the shift
valve (29) via the command valve (31). See Fig. 140
. Its shift condition is retained in the shift phase, whilst the
shift element pressure acting on the end face and which is variable during the shift phase is replaced by a
corresponding, constant pressure.
When the multiple-disc clutch (K) is engaged (K) the end face of the shift pressure shift valve (29) is
depressurized during the stationary and shift phases, here the shift condition is also retained during the shift
phase.
Torque Converter Lockup Clutch PWM Solenoid Valve, Design

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:29 PMPage 251 © 2006 Mitchell Repair Information Company, LLC.

Fig. 142: Manual Drive Mode Selection, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation
With the selector lever on the floor shift it is possible to adapt the automatic gearshift sequence to suit specific
operating conditions. Although the selector lever position can be changed the forward gears while driving, the
electronic transmission control (ETC) prevents over-revving of the engine. See Fig. 142
.
Floor Shift, Location/Task/Design/Function

See .
Reverse Lamp Switch, Location/Task/Function

See REVERSE LAMP SWITCH, LOCATION/TASK/FUNCTION
.
Shift Detent Mechanism, Location/Task/Design/Function

See SHIFT DETENT MECHANISM, LOCATION/TASK/DESIGN/FUNCTION (WITHOUT
TOUCH SHIFT).
D-4 Shift Isolating Mechanism, Location/Task/Design/Function

See D
-4 SHIFT ISOLATING MECHANISM, LOCATION/TASK/DESIGN/FUNCTION.
Location/Task/Design/Function Of R/P Lock

See LOCATION/TASK/DESIGN/FUNCTION OF R/P LOCK (WITHOUT TOUCH SHIFT)
.
Position Sensor, Location/Task/Function

See POSITION SENSOR, LOCATION/TASK/FUNCTION
.
Transmission Range Recognition Switch, Location/Task/Design/Function

See TRANSMISSION RANGE RECOGNITION SWITCH,
LOCATION/TASK/DESIGN/FUNCTION.
ETC Control Module, Location/Task

See ETC CONTROL UNIT, LOCATION/TASK
.
Floor Shift, Location/Task/Design/Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:29 PMPage 255 © 2006 Mitchell Repair Information Company, LLC.

Fig. 146: Manual Drive Mode Selection, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation
With the selector lever on the floor shift it is possible to adapt the automatic gearshift sequence to suit specific
operating conditions. See Fig. 146
. Although the selector lever position can be changed in the forward gears
while driving, the electronic transmission control (ETC) prevents over-revving of the engine.
Floor Shift, Location/Task/Design/Function

See FLOOR SHIFT, LOCATION/TASK/DESIGN/FUNCTION
.
Shift Detent Mechanism, Location/Task/Design/Function

See SHIFT DETENT MECHANISM, LOCATION/TASK/DESIGN/FUNCTION

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

See LOCATION/TASK/DESIGN/FUNCTION OF R/P LOCK
.
Position Display, Location/Task

See POSITION DISPLAY, LOCATION/TASK
.
ETC Control Module, Location/Task

See ETC CONTROL UNIT, LOCATION/TASK
.
Control Module For Electronic Selector Lever Module, Location/Task/Design

See .
Floor Shift, Location/Task/Design/Function
TRANSMISSION with touch shift.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:29 PMPage 261 © 2006 Mitchell Repair Information Company, LLC.

The R/P lock is integrated in the electronic selector lever module control module (N15/5).
R/P Lock, Task

Depending on the condition the R/P lock prevents shifting out of selector lever position "P" or changing
into selector lever position "R" from "N".
R/P Lock, Design

The R/P lock consists of:
The locking disc (69) rigidly connected to the selector lever (80).
The locking lever (90).
The R/P locking solenoid (89).
R/P Lock, Function

See R/P LOCK, FUNCTION
.
R/P Lock, Function (With Touch Shift)

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:29 PMPage 268 © 2006 Mitchell Repair Information Company, LLC.