Land Rover Range Rover Automatic Transmission System Rover Manual

© Rover Group 1997
 Automatic Transmission Syste m Informat ion Document
Range Rover
Automatic
Transmission
System Information Document
APPLICABILITY1995-1997 Range Rover
DATE OF REVISION 1997 

Page 1 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - System Information
Model: 1995-97 Range Rover See page 8 for SRO and time for 
Electrical Symptom diagnosis
The diagnosis of automatic transmission faults requires that the technician take a systematic ap-
proach to the determination of the fault involved. There are two systems involved; the mechanical
operation of the transmission and the electronic control of the transmission via the Transmission
Control Module (TCM). It is...

Page 2 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - System Information
Model: 1995-97 Range Rover
Schematic 1
MV1MV2TC LOCKPRESSURE 
LRLR
32 15 17 34 18 35 16 33
KRKUKNKBBG
NBNBNBNB
MILInstrument Pack
C4 C31 A27 A29C27 A23 A22 C7
BeCM
GEMS
Serial Link
H Gate C617
X Y Z
Vehicle SpeedEngine Speed
MILFuel LevelP1607
P0460/1(                     )
(                     )
ABS
TCU C603TCM
19 17 32 31 7 30 1350
29
Output Shaft
Speed Sensor
Motor Encoder
14
19 5 24 42 6 20 2 38 32 47 213
(ECU...

Page 3 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - System Information
Model: 1995-97 Range Rover
Economy, Sport and Manual Modes
The TCM has various different driving modes available, with Economy being selected automati-
cally on start up. When the vehicle is in High range, Sport mode can be selected. Sport mode
makes gear change much more sensitive to throttle movement, thereby shifting down earlier and
holding onto lower gears longer than Economy mode. If the vehicle is in Low...

Page 4 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - System Information
Model: 1995-97 Range Rover
Interface with Body electronic Control Module (BeCM) , see schematic 1
The BeCM provides power to the TCM via an ignition feed fuse F6 and a permanent feed via fuse F3.
In addition to power, the BeCM also routes the engine speed signal that the GEMS ECM outputs
and the diagnostic K/L lines that go to the Data Link Connector (DLC). The TCM, ECM, HEVAC,
ABS and BeCM are all attached to the...

Page 5 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - System Information
Model: 1995-97 Range Rover
Pressure Regulator Solenoid
The gear shift quality is controlled by modulating the pressure regulator, which is controlled by the
TCM. The solenoid is powered closed, so that if a failure occurs, then the regulator will allow de-
fault gear change. Figure 1 shows the transmission electrical connections and the resistance
across all pins.
Torque Converter Lock-Up Solenoid
The torque...

Page 6 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - System Information
Model: 1995-97 Range Rover


PIN FUNCTION
1 Rough Road Detected
2 Cam Sensor
3Ð
4 Low Range Detected
5Ð
6Ð
7 Fuel Level
8 HO2S Bank B Upstream
9Ð
10 Knock Sensor Ground
11 Knock Sensor A
12 Knock Sensor B
13 Air Temperature
14 Coolant Temp
15 Throttle Position
16 Mass Air Flow
17 HO2S Bank A Downstream
18 Park/Neutral
19 Ð
20 Diagnostic L Line
21 Heated Front Windshield
22 Ð
23 Diagnostic K Line
24 Ð
25 Ð
26...

Page 7 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - System Information
Model: 1995-97 Range Rover

1
20
38
PIN FUNCTION
1 Ignition Supply
2 Vehicle Speed Sensor Positive
3 Engine Speed
4Ð
5 Solenoid Valve MV2
6 Pressure Regulator Solenoid
7 Digital Ground
8Ð
9Ð
10 Ð
11 Ð
12 Ð
13 Ð
14 Gear Position Switch-Y Line
15 Diagnostic L Line
16 MES 1
17 Ð
18 Ð
19 Solenoid Valves Supply
20 Earth (Screens)
21 Engine Torque (PWM)
22 Ð
23 Ð
24 Solenoid Valve MV2
25 Ð
26 Power Ground
27 Ð
28 Ð
PIN...

Page 8 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - Electrical Symptoms SRO/Time:
Model: 1995-97 Range Rover 19.22.97 - TestBook hookup access codes,
 compete DTCR and diagnostic drive cycle ªBº 
per bulletin W96-007 1.05 hrs.
TestBook
1. Hookup TestBook and follow directions to retreive
fault codes in line with service bulletin W96-007.
2. Complete a DTC refport and fax to LRNkA.
3. Follow diagnostic directions from TestBook in order
to locate problem.
4. Use the following information...

Page 9 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - Electrical Symptoms
Model: 1995-97 Range Rover
 
 DTC
 
 DTC
NAME 
 FAULT
DESCRIPTION 
 OBD II MONITORING
CONDITIONS 
 
TRIP
OCCURRENCES
TO MIL 
 
GEARBOX
FAULT
MESSAGE 
 
LIMP
HOME
DEFAULT
 23 FME Engine torque
reduction Drive through all gear
ranges. 2 Y Poor shift quality ± maximum
pressure on shifts
 
 24 
 FRSS 
 Output speed sensor
signal out of range 
 Drive vehicle and accelerate
to force a downshift. 
 2 
 Y 
 Limp home in...