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

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 

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...

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...

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 

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...

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...

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...

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...

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...

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-...