Iveco Stralis AT/AD. Manual — part 349
III.180
ELECTRONIC SYSTEMS
S
TRALIS
AT/AD
Base - January 2003
It is integrated into the gearshift actuator.
Automatic transmission management enables automating speed selection and meshing with automatic clutch and engine control.
It interfaces with the other on-board electronic systems such as the EDC, EBS, INTARDER and Instrument Cluster via a CAN
V.D.B. Vehicle Data Bus line.
From connection with the EDC system the transmission electronic center can detect accelerator pedal position, fuel delivery,
engine rpm and engine brake and kick-down activation.
The center inside houses center temperature, transmission oil temperature and low air pressure sensors to improve system
operation.
Function AL is enabled at <5.8 bar pressure and disabled at> 6 bars. The Automated EuroTronic transmission electronic center
offers the possibility of a Cluster displayed error code for preliminary diagnosis and is also provided with an advanced self-diagnosis
system capable of identifying and storing any even intermittent anomaly dependent on environmental condition the system may
have encountered during operation, to ensure more correct and reliable repair.
CAB SIDE CONNECTOR (x1)
SENSOR SIDE/CLUTCH ACTUATOR CONNECTOR (x2)
ELECTRONIC SYSTEMS
III.181
S
TRALIS
AT/AD
PIN
Cable
Description
Pin
Cable
Description
1
8802
Power from Body Computer (J 3/6)
1
—
—
2
2297
Positive 30-pole connector for ground
diagnosis
2
—
—
3
SB
CAN line to speed selector PIN 8
3
—
—
4
7101
Positive from fuse 70602
4
—
—
5
7101
Positive from fuse 70602
5
—
—
6
SB
CAN line to speed selector PIN 7
6
—
Gearshift speed sensor mass
7
—
Free
7
—
Signal electrovalve Y17 (slow opening)
8
WS/BI
CAN VDB line
8
—
Signal electrovalve Y16 (fast opening)
9
—
Free
9
—
Signal electrovalve Y15 (slow closing)
10
—
Free
10
—
Clutch position sensor analogic signal
11
6100
Positive from speed selector PIN 15
11
—
Gearshift/transmission outgoing speed
sensor signal
12
GN/VE
CAN VDB line
12
—
Signal electrovalve Y14 (fast closing)
13
—
—
13
—
—
14
—
—
14
—
—
15
—
—
15
—
Clutch position sensor power supply
16
0050
Negative
16
—
Y15 - Y17 electro valve mass
17
0050
Negative
17
—
Y14 - Y16 electro valve mass
18
—
—
18
—
—
19
—
—
19
—
Gearshift/transmission speed sensor power
supply
20
—
—
20
—
Clutch position sensor mass
PIN-OUT CONNECTOR
III.182
ELECTRONIC SYSTEMS
S
TRALIS
AT/AD
Base - January 2003
The speed selector is an electronic component located inside the cab to the operator’s side, which receives a series of signals from
some system components such as the P.T.O. request switches, the engine brake request switch, the door opening push button and
the like, and informs the electronic center that in its turn decides the various operating strategies to implement. It communicates
with the electronic center via a CAN V.D.B. Vehicle Data Bus line and is powered at a 24 Volts by the center and vehicle batteries
via +15. The latter is also used with a special procedure to enable error code display.
Pin
Cable
Function
1
-
-
2
-
-
3
-
-
4
0136
Negative signal for PTO 2 remote switch cutin
5
-
-
6
-
-
7
SB
CAN line for communication with the transmission electronic center
8
SB
CAN line for communication with the transmission electronic center
9
-
PTO 1 on return signal
10
-
-
11
-
PTO 2 on return signal
12
-
-
13
0134
Negative signal for PTO 1 remote switch cutin
14
8101
Power under key (+ 15)
15
6100
Power from transmission electronic center
16
0050
Mass
SB = System Bus
ELECTRONIC SYSTEMS
III.183
S
TRALIS
AT/AD
TRANMSISSION ACTUATOR
The transmission actuator is mounted on the top of the main gearbox. It consists of a series of electro valves, control cylinder and
sensors. The electronic center powers the various electro valves to selected gear ratios available by using sensor signals as a feed-
back. Actuator operating pressure is 7 bars.
Actuator components
Y1
Inertia brakes control electro valve
Y2
Fast Splitter control electro valve
Y3
Slow Splitter control electro valve
Y4
Speed selection control electro valve
Y5
Speed selection control electro valve
Y6
Gear meshing control electro valve
Y7
Gear meshing control electro valve
Y8
Downshifted speed epicyclical unit control electro valve
Y9
Normal speed epicyclical unit control electro valve
Y10
Cmpressed air supply electro valve
B2
Transmission input rpm sensor
B4
Selected speed sensor
B5
Selector position sensor
B6
Normal and downshifted speed epicyclical unit position sensor
B7
Splitter position sensor
The actuator cannot be overhauled. For actuator removal, transmission must be on NEUTRA.
The transmission neutral warning switch is located on the gearshift.
Electro valves are of the N.C. on/off type powered at 24 Volt with ~64.2 Ohm resistance at 20
°C.
Induction type transmission input rpm sensor B2 features ~1 Kohm resistance and identified rpm with a 40-teeth sound wheel.
This signal is compared with the engine rpm measured by the E.D.C. center; if the two values are NOT identical the transmission
center is enabled to detect clutch slide.
Induction type sensors B4, B5, B6 and B7, respectively selector position, epicyclical unit and splitter, are an integral part of the
control cylinders and feature ~ 69 Ohm resistance at 20
°C.
The automatic system pressure sensor located downstream the reduction gear is also integrated inside the center.
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