Land Rover Range Rover Etm 1995 4th Edition Rover Manual

							TRANSFER GEARBOXB6
3CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
C624
13
3
W
2
23
15
GR
14
NR
S607
30
F 4
30 A
See Ground Dis-
tribution
Automatic Gear-
box
S604
X190
Vehicle Speed
Sensor
E621
30
U
1
C603
C567 P
14C56013
3
C660S603Z256
Transfer Gear
Box ECU
7C625
1
21
15
F 6
10 A
WY
24PC6034
Automatic
TransmissionManual Trans-
mission
4 C625
36
4
35
NY
NW5
C626
15
29
S601
R UZ268
Vehicle Speed
Sensor Shield
Z238
Body Electrical
Control Module
(BECM)B B
BFuse F11 is only
installed when
towing the vehicle
SCR
F 11*
30 A
* 
						

							TRANSFER GEARBOXB6
4CIRCUIT DIAGRAMC626
X298
Transfer Micro
Switch/Shift
Lock Solenoid
[1] Transfer
Micro
Switch
[2] Lo Range
Selected
[3] Shift Lock
Solenoid
(with Shift
Lock only)
X297
Transfer Switch
Manual
[1] Change
Range
[2] On with Lo
Range Se-
lected
1 C635
B6
B
Z256
Transfer Gear
Box ECU
6
S607
See Ground Dis-
tribution
E621C625Z238
Body Electrical
Control Module
(BECM) C603
33
2PG
5
Manual Trans-
missionAutomatic
Transmission
B
2 C615APR
With Shift Inter-
lock
11C625Z238
Body Electrical
Control Module
(BECM)
3 C635RU
15
5GP
[2]
[1]
0
4
0 [2]
[1][3]
1 C615A
E621
S607
S611
With Shift Inter-
lock PG
B B
See Ground Dis-
tribution S612
Interior Lamps
PG
2
C615B34
C605
C615B
1C605
B
30
F 13
20 A 
						

							TRANSFER GEARBOXB6
5CIRCUIT DIAGRAM
Diesel Petrol
18C626
20
1
Automatic
Transmission
N
28C572
UNUN
2
0
1
34 C603
E529
S551
N
B
See Ground Dis-
tribution UN
C581
3
C551
34 C603
Manual Trans-
mission
C660
11
C560
C563
C563
Not used
3 C551
C5604
C660
8
UB
1
X294
Gear Box Posi-
tion Switch
[1] X Switch
[2] Y Switch
[3] Z Switch
[1]
0
9
UP
2
See Ground Dis-
tribution
6
E621 C562
[2]
0
7
C660 610
18 C626
UG
3
[3]
0
C562
C659
C559S608
S609
S610
Automatic Gear-
box
C560
XYZ
C626
E574Petrol
Diesel Z256
Transfer Gear
Box ECU
Z132
Engine Control
Module (ECM)Z238
Body Electrical
Control Module
(BECM)
X293
Neutral Switch
Z238
Body Electrical
Control Module
(BECM)
P01 1
R00 1
N10 1
D10 0
3000
2010
1110
Z* 1 1 1
XY Z
1 =
0 =
* =Switch Open
Switch Closed
Fault 
						

							TRANSFER GEARBOXB6
6CIRCUIT DIAGRAM5
Z256
Transfer Gear
Box ECU
17
KB
1
K154
Transfer Box
Drive Motor/
Encoder
1
0
32
KN
2
1
0
17C660
1819
7
KR
4
1
0
C560
S1 S2 S4
31
KU
3
1
0
S3
16
C568
25
RP
26
RP
7
2C658
1
1 C603
RS
8C568
C558
2
111 0
10 01
0010
0000
1000
1001
00 10
0101S2 S3 S4
19C603
Z256
Transfer Gear
Box ECU
B
C560
2
C660
BG
M
S1
Left Stop
Left of Hi Mode
Neutral Mode Zone 1 Right of Hi Mode Hi Mode
Right Stop Lo Mode Zone 2RS
0100
1 =
0 =Switch Open
Switch Closed 
						

							AUTOMATIC GEARBOXB7
CIRCUIT OPERATION1
CIRCUIT OPERATION
Economy, Sport and Manual Modes
The Auto Gear Box Control Unit (Z255) has various
different driving modes available, with Economy
being selected automatically on start up. When the
vehicle is in High range, Sport mode can be
selected. This will make the gear change much more
sensitive to throttle movement, thereby shifting down
earlier and holding onto lower gears longer than the
Economy mode equivalent. If the vehicle is in Low
range, then Manual mode can be selected. This will
make the gear box change into the selected gear as
quickly as possible and hold on to that gear at all
speeds, i.e. if ª3º is selected, then the gear box will
not shift down to ª2º or ª1º as the vehicle slows
down. It will only change gear to prevent the vehicle
from stalling.
Interface to Petrol Engine Control Module (ECM)
(Z132)
The Auto Gear Box Control Unit (Z255) takes the
engine torque, engine speed and throttle angle
signals from the ECM, calculates which gear is
required, outputs to the solenoid valves and sends a
torque reduction signal back to the ECM, thereby
retarding the ignition point on each of the cylinders
and so giving a reduction in engine power during
gear changes that result in a smooth change.
The engine torque is received by the Auto Gear Box
Control Unit (Z255) on its pin 21, the engine speed
on pin 3 and the throttle angle on pin 47. The torque
reduction signal is sent to the ECM from the Auto
Gear Box Control Unit (Z255) via its pin 32.
Interface to Diesel Engine Control Module (ECM)
(Z132)
The functionality of the interface is similar to the
petrol interface, except for the format of the signal.
Interface to Auto Gear Box Control Unit (Z255)
Gear position Switch± pins 14, 33, 50
The gear position switch is mounted on the side of
the gearbox and contains five internal switches,
although only 3 are connected to the Auto Gear Box
Control Unit (Z255)via pins 50, 14, and 33. By
analysing the status of these 3 switches, the Auto
Gear Box Control Unit (Z255) calculates which gear
the vehicle is in.If a fault occurs with the switch, then the Auto Gear
Box Control Unit (Z255) may try to put the gearbox
into a different gear than the drivers request.
Solenoid Valves± pins 5, 6, 19, 24, 42
The Auto Gear Box Control Unit (Z255) has control
over 4 solenoid valves: MV1, MV2, torque converter
lock up and pressure regulator. These are all
supplied via pin 19, which is activated via a relay in
the Auto Gear Box Control Unit (Z255) itself.
MV1 ± pin 5, MV2 ± pin 24:
When the driver selects ªDºrive, then the Auto Gear
Box Control Unit (Z255) controls the gear selection
by the use of the two solenoid valves. If a fault
occurs with one or both of the valves, then a
different gear than the one selected will result.
If the Auto Gear Box Control Unit (Z255) defaults the
gearbox, then the common supply to all the solenoid
valves is removed and the gearbox mechanically
shifts either to third gear, if the vehicle is stationary,
or fourth, if moving. 
						

							AUTOMATIC GEARBOXB7
CIRCUIT OPERATION2
MV2 is also used to prevent the driver from selecting
reverse when the vehicle is moving forward at more
than 8 km/h and from disengaging reverse at reverse
speeds greater than 6 km/h. This is known as
ªReverse Safetyº and will not be available if MV2 is
non±operational and/or the gearbox has defaulted.
Torque Converter Lock±Up Solenoid ± pin 42:
The torque converter slips to allow smooth operation
of the gearbox. Lock±Up occurs when the vehicle
reaches a speed of 45MPH or above in either third
or fourth gears.
Pressure Regulator Solenoid ± pin 6:
The gear shift quality is controlled by modulating the
pressure regulator, which is controlled by the Auto
Gear Box Control Unit (Z255). The solenoid is
energised closed, such that if a failure occurs, then
the regulator allows default gear change.
Output Shaft Speed Sensor ± pins 2, 38, 20
The automatic gearbox system incorporates an
output shaft speed sensor which is input to the Auto
Gear Box Control Unit (Z255) on pins 2 and 38 with
a screen over the cable attached to pin 20. It is
important that this signal is screened correctly.
MES 1 and 2± pins 16, 31
The two Manual/Economy/Sport (MES) lines indicate
to the BeCM (Z238) which mode has been selected
or if a fault within the transmission has occured.
Interface to Transmission Gearbox Control Unit
(Z256)
± High/Low Range Signal± pin 46
The High/Low signal is used by the Auto Gear Box
Control Unit (Z255) to select the correct mode on
application of the ªMESº switch. Also, the gear shift
points and strategies are very different in the
different ranges.
Interface to ªH±Gateº± pin 29
The ªHº±Gate sensor module (Z254) displays
selected gear information from the Gear Box
Position Switch (X294), ratio information from the
Transmission Gearbox Control Unit (Z256) and
mode information from the gear box Auto Gear Box
Control Unit (Z255). The H±Gate receives an ignition
2 signal on the W wire. This is fed via fuse 6. It is
grounded to the console ground E621 via the B wire.
Information on the selected gear (PRNDL) is
received from the Gear Box Position Switch (X294)
on wires UB, UP, UG. These three lines also go tothe Auto Gear Box Control Unit (Z255) and the
BeCM (Z238).
Information on the gear box mode (sport or manual)
is received on the YG wire and the YR wire. These
two lines also go to the BeCM (Z238).
The Transmission Gearbox Control Unit (Z256) high
status is received on the NY wire. The low status is
received on the NR wire. These two lines also go the
Transmission Gearbox Control Unit (Z256) and the
BeCM (Z238).
The illumination signal is on the RU wire.
The mode request is on the UO wire. This is sent
from the H±gate Sensor Module (Z254) to the Auto
Gear Box Control Unit (Z255). The line is activated
and deactivated by pressing the momentary action
MODE button. The line is active at all times. 
						

							AUTOMATIC GEARBOXB7
3CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
11
S
3
12
K
51
1 C626
LG
15
30
F 3
5 A
7
PY
39
15
F 6
10 A
3 C625
W
1
S602See Fuse Details
Z132
Engine Control
Module (ECM)
31 C507
SR27
YO29 C505
SP
6 C55154
71
C659
S607
726C601
See Ground Dis-
tribution
E621Z255
Auto Gear Box
Control Unit
324721
C601
Z132
Engine Control
Module (ECM)
43
SR40C572
YO
6 C55154
SR YO SP
Not used
C581
BC559
OY C501 W
9Diesel Petrol 
						

							AUTOMATIC GEARBOXB7
4CIRCUIT DIAGRAM
7
8
Z256
Transfer Gear
Box ECU
S604
S603
35 C60314
NY NR
Z238
Body Electrical
Control Module
(BECM)
S612
11 C6252
RU W
15
F 6
10 A
Z255
Auto Gear Box
Control Unit
29 C60131
UO YR
316 C626 5
Z254
H Gate Sensor
Module
[1] Mode (MES)
Switch
[2] Illumination
1 C617
HiLo
1129710 C617
16
6
46 C601
S606
S605
[2]
[1]
MANUAL
SPORT
P
R
N
D
3
2
1
P
R
N
4
3
2
1
01
See Ground Dis-
tribution
E621 HI LO 15
31MES1 MES2 S/E/M NY NR
YG
Interior Lamps
E00
SPORT01
MANUAL10
11
MES1 MES2
1=VBATT±2V Mode
Fault
YR YG 
						

							AUTOMATIC GEARBOXB7
5CIRCUIT DIAGRAM
UB
Z254
H Gate Sensor
Module
O
O
O
O
O
O
O
See Ground Dis-
tribution
E574Note! Status of X,
Y, Z Switches
only affects Red
Illumination dots
P
R
N
D
3
2
1
XYZ
S610
S609C617
5
4
3
18 C6269
UG UP8
UBZ238
Body Electrical
Control Module
(BECM)
S608UP UG
X294
Gear Box Position
Switch
[1] X Switch
[2] Y Switch
[3] Z Switch
5 C562
S551
B
E529
See Ground Dis-
tribution
E621
6BG
5 C560
C660
10
C559 C659
XYZ
[1] [2] [3]
00 0P
R
N
D321P
R
N
D321
Not used
Not used C551
1
4 C562 3 C562 2 1
67
C560 C660
33 C60114
UG UP50
UB
Z132
Engine Control
Module (ECM)
1
C551 C501
18 C507
BO
Z255
Auto Gear Box
Control Unit
Diesel Petrol
HI
Petrol
Diesel
P01 1
R00 1
N10 1
D10 0
3000
2010
1110
Z* 1 1 1
XY Z
1 =
0 =
* =Switch Open
Switch Closed
Fault 
						

							AUTOMATIC GEARBOXB7
6CIRCUIT DIAGRAM
101
211
310
400
MV1 MV2
1 =
0 =Z255
Auto Gear Box
Control Unit
19 C601
3
C559 C659 OLG
Z255
Auto Gear Box
Control Unit Z263
Gearbox Case
[1] MV1 Solenoid
[2] MV2 Solenoid
[3] Converter
Lock Up Sole-
noid
[4] Pressure
Regulator So-
lenoid
[5] Output Shaft
Speed Sensor
Solenoid Ener-
gized
Solenoid Not En-
ergized
[1][2][3][4]
H
4
5
K
5
24
6
42
B
8C559
C659
6
L
8
2
F C561
9C560
C660
38 C601
E
SCR SCR
10
20
SCR
+
±
[5]
M C561
OP OW SO OGOK OB
KLGear
Z269
Output Shaft
Speed Sensor
Shield