Land Rover Range Rover Etm 1997 99 Gems 6th Edition Rover Manual

							STARTING AND CHARGINGB1
9TROUBLESHOOTING Z238
Body Electrical Control
Module (BECM)
BAT VOLT
OKOKPROBLEM CAUSE
OKOK
2B
1C
CONDITIONS
Ignition Switch
Position: III
RESULTS
Less than 0.5V
B
CONDITIONS
Ignition Switch
Position: II
RESULTSWire -
-

 



Engine runningBattery Terminal Con-
nection Ground Connections
-
Test C
1B
PROBLEM CAUSE
Starter -
-Starter Solenoid
PROBLEM CAUSE
NY Wire -PROBLEM CAUSE
Body Electrical Con-
trol Module (BECM) -

 VC114

 V
BB
NY
Instrument Cluster - 
						

							CRUISE CONTROLB5
CIRCUIT OPERATION1
CIRCUIT OPERATION
Petrol Engine
For vehicles equipped with a manual transmission,
cruise control can only be activated when the Cruise
Control Switch (X115) is depressed, the transfer
gear box is in Hi range, and the clutch pedal is not
depressed. Also, the BeCM (Z238) will deactivate
cruise control if the engine rpm rises above 5000 +
10%, due to the possibility of selecting gears
manually without the use of the clutch.
For vehicles equipped with an automatic
transmission, cruise control can only be activated
when the Cruise Control Switch (X115) is depressed,
the transfer gear box is in Hi range, and the
transmission is in one of the forward gears.
With the Cruise Control Switch (X115) on, a ground
signal is applied to C255/Pin 14 of the BeCM
(Z238).The BeCM (Z238) then suplies signal voltage
via its Pin 18 to the Converter/Inverter (Z249), to Pin
10 of the Cruise Control ECU (Z121) and to the
ªOperationº bulb of the Cruise Control Switch (X115).
The transfer gearbox Hi range status from the
Transfer Gear Box ECU (Z256) is applied to
C626/Pin 3 of the BeCM (Z238). The X, Y, and Z
switch status (PRND321 position information) from
the gearbox position switch is applied to C626/Pins
8, 9, and 18 of the BeCM (Z238). The clutch pedal
position input is applied to C255/Pin 4 and the
engine speed input C112/Pin 9 of the BeCM (Z238).
When the transfer gearbox is in Hi range, a forward
gear is selected and the Cruise Control Switch
(X115) is on, theBeCM (Z238) suplies voltage via
C258/Pin 1 and the Brake Switch Vent Valve (X112)
to the Cruise Control ECU (Z121) Pin 9, which then
ªknowsº that cruise control can be operated.
When cruise control is activated and a cruise speed
is set, the Cruise Control ECU (Z121) applies
voltage through the OU wire and ground through the
OR wire to operate the Cruise Control Vacuum
Pump (M103) motor. The Cruise Control ECU (Z121)
applies ground through the OK wire to close the
normally open solenoid valve in the pump. The pump
applies vacuum to the actuator.
SET/ACCEL
To set a cruise speed, the Cruise Control Switch
(X115) must be on and vehicle speed must exceed
28 mph (45 km/h). When the SET/ACCEL Switch is
depressed under these conditions, the
Converter/Inverter (Z249) is supplied with a groundsignal. This signal is ªconvertedº to a voltage signal
and is transmitted via the SY wire to the Cruise
Control ECU (Z121) terminal 3, causing the vacuum
pump to operate. When the SET/ACCEL Switch is
released, the signal is removed from terminal 3,
signalling the ECU to set the speed.
RES/DECEL
When the RES/DECEL Switch is depressed, a signal
is applied via the RY wire to terminal 4 of the Cruise
Control ECU (Z121). This tells the ECU (Z121) to
disengage the system and the vehicle slows down.
When the switch is depressed a second time, the
signal is again applied to the ECU (Z121) and the
vehicle returns to the previously set speed.
Speed Input
Terminal 11 of the Cruise Control ECU (Z121)
receives the Vehicle Speed output signal from the
BeCM (Z238) through the Y or YR wire. The BeCM
(Z238) receives the vehicle speed signal from the
Anti±lock Brake System ECU (Z108). The signal is a
pulsing voltage and its frequency changes with
vehicle speed. 
						

							CRUISE CONTROLB5
CIRCUIT OPERATION2
System Disable
The cruise control system can be disabled in one of
four ways:
8. The Cruise Control Switch (X115) is put in the 0
position, removing the BeCM (Z238) power from
the Cruise Control ECU (Z121) and vacuum
pump, and erasing the set speed memory.
9. The RES/DECEL Switch is depressed, signalling
the Cruise Control ECU (Z121) via the Inverter/
Converter (Z249) to disengage the system.
10. The brake pedal is depressed and a vacuum val-
ve in the Switch Vent Valve opens (X112). This
vents vacuum to the actuator valve and releases
the throttle.
11. The Voltage applied to the Cruise Control ECU
(Z121) terminal 9 is interrupted, causing the
Cruise Control ECU (Z121) to turn off the va-
cuum pump and de±energize the vacuum sole-
noid valve. This voltage path is interrupted when:

The brake pedal is depressed. With the brake
pedal depressed, the Brake Switch Vent Valve
(X112) moves to position 1 and the circuit is in-
terrupted.

The transfer gear box is not in Hi range.

The vehicle speed does not exceed 28 mph (45
km/h).

The vehicle is not in a forward gear (P, R, or N)
(Automatic Transmission).

The clutch pedal is depressed (Manual Trans-
mission).

The engine rpm rises above 5000 +10% (Ma-
nual Transmission).
The BeCM (Z238), which monitors these signals, will
then remove power from C255/Pin 18.
Diesel Engine
For vehicles equipped with a manual transmission,
cruise control can only be activated when the Cruise
Control Switch (X115) is depressed and the clutch
pedal is not depressed. The Diesel Engine Control
Module (Z132) will not allow the engine to overspeed
if a cruise control speed is requested that is beyond
the capability of the engines speed range.
For vehicles equipped with an automatic
transmission, cruise control can only be activated
when the Cruise Control Switch (X115) is depressed,
the transfer gear box is in Hi range, and the
transmission is in one of the forward gears.With the Cruise Control Switch (X115) on, a ground
signal is applied to C255/Pin 14 of the BeCM (Z238).
The X, Y, and Z switch status (PRND321 position
information) from the gearbox position switch is
applied to C626/Pins 8, 9, and 18 of the BeCM
(Z238). The clutch pedal position input is applied to
C255/Pin 4 and the engine speed input is applied to
C112/Pin 9 of the BeCM (Z238). The BeCM (Z238)
then supplies voltage, via its Pin 18 to the
Inverter/Converter (Z249) and to the ªOperationº
bulb of the Cruise Control Switch (X115).
The Cruise Control Converter/Inverter Module
(Z249) supplies the Engine Control Module (Z132)
via its pin 4 with a voltage signal to ªswitch onº the
cruise circuit. For the Diesel Engine, the Engine
Control Module (Z132) controls the cruise circuit as
the Cruise Control ECU (Z121) does for the Petrol
Engine. The Engine Control Module (Z132) is also
responsible for the acceleration/deceleration of the
vehicle. 
						

							CRUISE CONTROLB5
CIRCUIT OPERATION3
SET/ACCEL
To set a cruise speed, the Cruise Control Switch
(X115) must be on and vehicle speed must exceed
28 mph (45 km/h). When the SET/ACCEL Switch is
depressed under these conditions, the
Inverter/Converter (Z249) is suppplied with a ground
signal. This signal is transmitted via the OY wire to
the Engine Control Module (ECM) (Z132) causing
the vehicle to accelerate. When the SET/ACCEL
Switch is released, the signal is removed signalling
the Engine Control Module (ECM) (Z132) to set the
speed.
RES
When the RES Switch is depressed, a signal is
applied to the ECM (Z132) and the vehicle will return
to the previously set speed.
Speed Input
The BeCM (Z238) receives the vehicle speed signal
from the Anti±lock Brake System ECU (Z108). The
BeCM (Z238) then provides the vehicle speed signal
to the Engine Control Module (ECM) (Z132). This
signal is a pulsing voltage and its frequency changes
with the vehicle speed.
System Disable
The cruise control system can be disabled in two
ways:
1. The Cruise Control Switch (X115) is put in the 0
position, causing the BeCM (Z238) to remove
power from the Engine Control Module (ECM)
(Z132) and erasing the set speed memory.
2. The Voltage applied via the Inverter/Converter
(Z249) to the Engine Control Module (ECM)
(Z132) terminal 20 is interrupted, causing the
Engine Control Module (ECM) (Z132) to disenga-
ge the system. This voltage path is interrupted
when :

The brake pedal is depressed. The Engine Con-
trol Module (ECM) (Z132) has two Stop Lamp
Switch (X168) inputs, each of opposite polarity.
The ECM (Z132) compares the polarity states to
determine when the brake pedal has been de-
pressed.

The vehicle speed does not exceed 28mph (45
km/h).

The vehicle is not in a forward gear (P, R, or N)
(Automatic Transmission).
The clutch pedal is depressed (Manual Trans-
mission).
The BeCM (Z238), which monitors these signals, will
then remove power from C255/Pin 18. 
						

							CRUISE CONTROLB5
CIRCUIT OPERATION4
Road Test
CAUTION: DO NOT ENGAGE CRUISE CONTROL
WHEN VEHICLE IS BEING USED IN LOW
TRANSFER GEARS.
WARNING: The use of cruise control is not
recommended on winding, snow covered or slippery
roads, or in heavy traffic conditions where constant
speed cannot be maintained.
1. Start the engine and depress the Cruise Control
Switch (X115) to activate the cruise control
system. Accelerate to approximately 30 mph (50
km/h) and press the SET/ACCEL Switch. Imme-
diately release the switch and remove foot from
the accelerator pedal. The vehicle should main-
tain the speed at which the SET/ACCEL Switch
was pressed.
2. Press the SET/ACCEL Switch and hold at that
position. The vehicle should accelerate smoothly
until the switch is released. The vehicle should
now maintain the new speed at which the SET/
ACCEL Switch was released.
3. Press the RES/DECEL Switch while the vehicle
is in the cruise control mode. The cruise control
should disengage. Slow to approximately 35 mph
(55km/h) and press the RES/DECEL Switch.
Immediately release the switch and remove foot
from the accelerator. The vehicle should
smoothly accelerate to the previously set speed.
Increase speed using the accelerator pedal. Re-
leasing the pedal should return the vehicle to the
previously set speed.
4. Depressing the brake pedal should immediately
disengage the cruise control system and return
the vehicle to drivers control at accelerator pe-
dal. Press the RES/DECEL Switch and the vehi-
cle should accelerate to the previously set speed
without operation of the accelerator pedal.
5. Press the RES/DECEL Switch and allow the ve-
hicle to decelerate to below 26 mph (42 km/h).
Press the RES/DECEL Switch and remove foot
from the accelerator pedal. The vehicle should
smoothly adjust to the previously memorized
speed.
6. Press the SET/ACCEL Switch below 28 mph
(45km/h) and the cruise control system should
remain disengaged. Accelerate the vehicle abo-
ve 28 mph (45 km/h), press the RES/DECEL
Switch and remove foot from the accelerator pe-
dal. The vehicle should smoothly adjust to the
previously memorized speed.
7. Pressing the Cruise Control Switch (X115)
should immediately disengage the cruise controlsystem and erase the previously set speed from
Cruise Control ECU (Z121)/Engine Control Mo-
dule (ECM) (Z132) memory. 
						

							CRUISE CONTROL (PETROL)B5
5CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
C211 C255
X115
Cruise Control
Switch
62
18 14
5
See Ground Dis-
tribution
4 C211
B
S208
E252
31
BB Z121
Cruise Control
ECU
10
C24343
RY
Z249
Cruise Control
Converter/In-
verter Module
C241P65
YR
8C241P42
2 C2351
Z119
Rotary Coupler
YS
C24723
X269
Steering Wheel
Switches
[6] Reset/Decel
[7] Set/Accel
C2476
PB
Z119
Rotary Coupler
See Ground Dis-
tribution S215
E252
WR
5 C235
RW WY SYOW
C243
WRInterior Lamps
[6] [7]S20200Petrol
01
B 
						

							CRUISE CONTROL (PETROL)B5
6CIRCUIT DIAGRAM
C626
Z256
Transfer Gear
Box ECU
C603
35
3NY
S603
Z108
Anti±Lock
Brake System
ECU
C116R
28
11 C114YG
Z238
Body Electrical
Control Module
(BECM)
C258
19
ONC227
1
1
X168
Stop Lamp
Switch
[1] Brake
Pedal De-
pressed
C227 2
YP [1] [1]
3
00
GP S211
15
F 17
Automatic Gear-
box
10A
See Fuse Details
Anti±Lock Brake
System
S201
C2584
Z121
Cruise Control
ECU C243
5
See Ground Dis-
tribution
8
B
S207
E252
Z238
Body Electrical
Control Module
(BECM)
C243
20
Y
11
X112
Brake Switch
Vent Valve
[1] Brake
Pedal De-
pressed
[1]
20
9
C228
OR
C255
YRLHD
RHD
LHD
C116L RHD
C228W Petrol 
						

							CRUISE CONTROL (PETROL)B5
7CIRCUIT DIAGRAM
Z121
Cruise Control
ECU
C243
61
OU
Z238
Body Electrical
Control Module
(BECM)
4
YG
2
See Ground Dis-
tribution
1
B
S215
E252 C230
8
X200
Clutch Pedal Position
Switch
[1] Clutch Pedal De-
pressed
[1] 0
UBAutomatic
Transmission
C230
7
OR OK
8 C204910
C15713
M103
Cruise Control
Vacuum Pump2
Manual
Transmission
M
P01 1
R00 1
N10 1
D10 0
3000
2010
1110
Z* 1 1 1
XY Z
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
BG
E621 C562
[2]
0
7C660
610
18 C626
UG
3
[3]
0
C562
C659
C559
5C560
S608
S609
S610
Automatic Gear-
box
C104
C560
C660C255
XYZ Petrol
1 =
0 =
* =Switch Open
Switch Closed
Fault 
						

							CRUISE CONTROL (PETROL)B5
8CIRCUIT DIAGRAM
2
C506B
9C112
S
C106B
2
C506A C106A
23 C505
NAS Except NASZ238
Body Electrical
Control Module
(BECM)
Z132
Engine Control
Module (ECM) Petrol 
						

							CRUISE CONTROL (DIESEL)B5
9CIRCUIT DIAGRAM REV: 02/98
See Ground
Distribution S207
E252
B
Z238
Body Electrical
Control Module
(BECM)
C211 C255
X115
Cruise Control
Switch
62
18 14
5
See Ground
Distribution
4 C211
B
S208
E252
31
BB
Z249
Cruise Control
Converter/In-
verter Module
C241D65YR
8C241D4
2 C2351
Z119
Rotary Coupler
YS
C24723
X269
Steering Wheel
Switches
[6] Reset/Decel
[7] Set/Accel
C2476
PB
Z119
Rotary Coupler
See Ground
Distribution S215
E252
WR
5 C235
RW WY OW
WRInterior Lamps
[6] [7]S20200
Z132
Engine Control
Module (ECM)
C572
20YO
19C571
2C102
OY
OYC202 C121
B
1 0
Diesel
2
4
U
C572
12
C586
K196
Fuel Pump Assembly
[1] Fuel Quantity
Solenoid
7 C586
[1]RWDiesel
S576