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

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    							CRUISE CONTROL (DIESEL)B5
10CIRCUIT DIAGRAM
Z108
Anti±Lock Brake
System ECU
C116R
28
11 C114YG
Z238
Body Electrical
Control Module
(BECM)
C258
139
Y
C227
29
1
X168
Stop Lamp
Switch
[1] Brake Pedal
Depressed
C227 2
YP[1] [1]
3
00
GP S211
15
F 17
10 A
See Fuse Details
Anti±Lock Brake
System
S203
Z132
Engine Control
Module (ECM)
See Ground Dis-
tribution B
S207
E252
9
S
50
C112
LHD
C116L RHD
C572 W
14C57120
26
3
680 
31
2
S106
14C202
C121 C102
9C202
C102
S201
K152
Resistor
S104Diesel Diesel
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    							CRUISE CONTROL (DIESEL)B5
11CIRCUIT DIAGRAM REV: 02/98
Z256
Transfer Gear
Box ECU
Z238
Body Electrical
Control Module
(BECM)
4
YG
2
See Ground
Distribution
1
B
S215
E252 C230
8
X200
Clutch Pedal Position
Switch
[1] Clutch Pedal
Depressed
[1] 0
UBAutomatic
Transmission
C230
C626320
Manual
Transmission
P01 1
R00 1
N10 1
D10 0
3000
2010
1110
Z* 1 1 1
XY Z
1
X294
Gear Box
Position Switch
[1] X Switch
[2] Y Switch
[3] Z Switch
[1]
0
9
UP
2
See Ground
Distribution
6
BG
E621 C562
[2]
0
7
C660 610
18 C626
UG
3
[3]
0
C562
C659
C559
5C560
S608
S609
S610
Automatic
Gearbox
C560
C660C255
XYZ
Automatic Transmission
Diesel
Switch Open
Switch Closed
Fault *  = 0 =  1= S603
Automatic
Gearbox
35
NY34
Z132
Engine Control
Module (ECM)
C603
28
4C560C660 3
C572
UN
C581
C551
Manual Transmission
UN
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    							CRUISE CONTROLB5
TROUBLESHOOTING HINTS12
TROUBLESHOOTING HINTS
8. If the interior lights operate but the cruise control
switch light does not illuminate, check the bulb, B
wire and RW wire. If the cruise control system
operates but the cruise control switch light does
not illuminate, check bulb and OW wire.
9. Inspect vacuum hoses for kinks and restrictions.
10. Inspect actuator linkage for restrictions and ad-
justment.
11. Check the following two input signals to the
BeCM (Z238): Signal from Clutch Pedal Position
Switch (X200) for vehicles equipped with a ma-
nual transmission, or the X, Y, and Z switch sig-
nals from the Gearbox Position Switch (X294) for
vehicles equipped with an automatic transmis-
sion.
12. For vehicles equipped with a Petrol Engine,
check the following input signal to the BeCM
(Z238): Transfer box in Hi range signal from
Transfer Gear Box ECU (Z256).
13. For vehicles equipped with a Diesel engine,
check the Stop Lamp Switch (X168) inputs to the
Engine Control Module (ECM) (Z132).
14. Note: For vehicles equipped with a manual trans-
mission, cruise control can only be activated
when the Cruise Control Switch (X115) is de-
pressed, the transfer gear box is in Hi range (Pe-
trol only), and the clutch pedal is not depressed.
Also, the BeCM (Z238) will deactivate cruise
control if the engine rpm rises above 5000 +/± 10
percent, due to the possibility of selecting ma-
nual without the use of the clutch (Petrol only).
For vehicles equipped with an automatic trans-
mission, cruise control can only be activated
when the Cruise Control Switch (X115) is de-
pressed, the transfer gear box is in Hi range (Pe-
trol only), and the transmission is in one of the
forward gears. The Transfer Gear Box ECU
(Z256) provides the BeCM (Z238) with transfer
gear box Hi range status. The Transfer Gear Box
Position Switch (X294) provides the BeCM
(Z238) with X, Y, Z switch status (PRND321 po-
sition information).
SYSTEM DIAGNOSIS
1. If the cruise control system does not operate cor-
rectly and the vehicle is equipped with a Petrol
Engine, do Test A.2. If the cruise control system does not operate cor-
rectly and the vehicle is equipped with a Diesel
Engine, do Test E.
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    							CRUISE CONTROLB5
13TROUBLESHOOTING
Test A
OKOK
OKOK
3A 1A
2A
CONDITIONS
Ignition Switch
Position: II
CONDITIONS
Ignition Switch
Position: 0
 
Less than 1 ohm
2A
GO TO TEST B
PROBLEM CAUSE
B Wire -Z121
Cruise Control
ECU
C243
Z121
Cruise Control ECU
C243
B
Cruise Control Switch
On

OW
RESULTS
VB
Within 1.5V of battery voltage
RESULTS
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    							CRUISE CONTROLB5
14TROUBLESHOOTING
OKOKPROBLEM CAUSE
OKOK
2B 3A
1B
CONDITIONS
Ignition Switch
Position: 0
WY
CONDITIONS
Ignition Switch
Position: II
Wire -
-
 

Cruise Control Switch
On
B Wire
-
Test B
2A
PROBLEM CAUSE
OW Wire -
-
Body Electrical Control Mod-
ule (BECM)
PROBLEM CAUSE
OW Wire - Cruise Control Switch
On

RESULTS
Less than 1 ohm
Z238
Body Electrical
Control Module
(BECM)

C255
WY
Z249
Cruise Control Con-
verter/Inverter Module
C241PV
OW

Transfer Box
Hi Range

Gear Selector
Forward Gear

Clutch Pedal
Released
BAT VOLT
Cruise Control Switch
RESULTS
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    							CRUISE CONTROLB5
15TROUBLESHOOTING
OKOK
OKOK
2B
3B
CONDITIONS
Ignition Switch
Position: II
BAT VOLT
CONDITIONS
Ignition Switch
Position: 0
 
1B
3B
GO TO TEST C
PROBLEM CAUSE
YR, W Wire -
-
B, PB Wire
Steering Wheel Switches -PROBLEM CAUSE
Cruise Control Converter/In-
verter Module -
C243 RY
On
OffZ249
Cruise Control Con-
verter/Inverter Mod-
ule
C241P

YR
Less than 1 ohm
More than 10K ohms=
=
Cruise Control Switch
On

RESULTS
Steering Wheel Switches
RES/DECEL Switch

On
Off=
=
0V
RESULTS
Steering Wheel Switches
RES/DECEL Switch

Rotary Coupler -
V
Z121
Cruise Control ECU
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    							CRUISE CONTROLB5
16TROUBLESHOOTING
On
Test C
OKOK
OKOK
1C
2C
2C
GO TO TEST D
PROBLEM CAUSE
YS,R Wire -
-
Rotary Coupler
Steering Wheel Switches -PROBLEM CAUSE
Cruise Control Converter/In-
verter Module -
Less than 1 ohm
Z249
Cruise Control Con-
verter/Inverter Module CONDITIONS
Ignition Switch
Position: 0
RESULTS
Steering Wheel Switches
SET/ACCEL Switch

Off More than 10K ohms
 C241P
YS
= = CONDITIONS
Ignition Switch
Position: II
BAT VOLT

C243 SY
Cruise Control Switch
On

RESULTS
Steering Wheel Switches
SET/ACCEL Switch

On
Off=
=
0 V
V
Z121
Cruise Control ECU
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    							CRUISE CONTROLB5
17TROUBLESHOOTING
Test D
OKOKPROBLEM CAUSE
OKOK
3D 1D
2D
GP Wire -
-
2D
W Wire
Stop Lamp Switch -
PROBLEM CAUSE
OR, ON Wire -
-
Brake Switch Vent Valve
Body Electrical Control
Module (BECM) -
Released
Z121
Cruise Control ECU CONDITIONS
Ignition Switch
Position: II
RESULTS
Brake Pedal
Depressed

BAT VOLT
0 V

C243
GP
=
=
CONDITIONS
Ignition Switch
Position: II
BAT VOLT

C243 OR
Cruise Control Switch
On

RESULTS
Brake Pedal

Depressed
Released=
=0 V
V
Z121
Cruise Control ECU Transfer Box
Hi Range

Gear Selector
Forward Gear

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    							CRUISE CONTROLB5
18TROUBLESHOOTING
OKOKPROBLEM CAUSE
OKOK
3D
4D
CONDITIONS
Ignition Switch
Position: II
Y,  Y R
CONDITIONS
Ignition Switch
Position: II
Wire -
-

4D

Cruise Control Switch
On
Body Electrical Control
Module (BECM)
2D
PROBLEM CAUSE
OU, OR -
-
Cruise Control Vacuum
Pump Turn a drive wheel by hand

RESULTS
=
C243 YR
V
Z121
Cruise Control ECU Y LHD
RHD5V with ignition position II
RESULTS
Cruise Control Vacuum Pump
Operates

C243
Z121
Cruise Control ECU
OR
OU
OR
Wire
5D
Transfer Gearbox
Hi Range

Gear Selector
Forward Gear

Brake Pedal
Released
=
2.5V approx. with wheels turning
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    							CRUISE CONTROLB5
19TROUBLESHOOTING
BAT VOLT
OKOKPROBLEM CAUSE
OKOK
5D
1E
CONDITIONS
Ignition Switch
Position: II
OK
CONDITIONS
Ignition Switch
Position: II
Wire -
-
 

Cruise Control Switch
On
Cruise Control Vacuum
Pump
Test E
4D
PROBLEM CAUSE
Cruise Control ECU -
GO TO TEST F
C243
Z121
Cruise Control ECU
Gear Selector
Forward Gear


Clutch Pedal
Released
Cruise Control Switch
On

RESULTS
Cruise Control Vacuum Pump
Operates

Throttle Opens Wide Valve Closes
OK
OR
Z249
Cruise Control Con-
verter/Inverter Module
 VC241DOW
B
RESULTS
2E
Transfer Gearbox
Hi Range

Gear Selector
Forward Gear

Brake Pedal
Released

OU
OR
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