Range Rover 2. Electrical Manual — part 20
CRUISE CONTROL
B5
18
TROUBLESHOOTING
OK
OK
PROBLEM CAUSE
OK
OK
3D
4D
CONDITIONS
Ignition Switch
Position: II
Y, YR
CONDITIONS
Ignition Switch
Position: II
Wire
-
-
D
D
4D
D
Cruise Control Switch
On
Body Electrical Control
Module (BECM)
2D
PROBLEM CAUSE
OU, OR
-
- Cruise Control Vacuum
Pump
Turn a drive wheel by hand
D
RESULTS
=
C243
YR
V
Z121
Cruise Control ECU
Y
LHD
RHD
5V with ignition position II
RESULTS
Cruise Control Vacuum Pump
Operates
D
C243
Z121
Cruise Control ECU
OR
OU
OR
Wire
5D
Transfer Gearbox
Hi Range
D
Gear Selector
Forward Gear
D
Brake Pedal
Released
D
=
2.5V approx. with wheels turning
CRUISE CONTROL
B5
19
TROUBLESHOOTING
BAT VOLT
OK
OK
PROBLEM CAUSE
OK
OK
5D
1E
CONDITIONS
Ignition Switch
Position: II
OK
CONDITIONS
Ignition Switch
Position: II
Wire
-
-
D
D
D
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
D
D
Clutch Pedal
Released
Cruise Control Switch
On
D
RESULTS
Cruise Control Vacuum Pump
Operates
D
Throttle Opens Wide
Valve Closes
OK
OR
Z249
Cruise Control Con-
verter/Inverter Module
V
C241D
OW
B
RESULTS
2E
Transfer Gearbox
Hi Range
D
Gear Selector
Forward Gear
D
Brake Pedal
Released
D
OU
OR
CRUISE CONTROL
B5
20
TROUBLESHOOTING
OK
OK
PROBLEM CAUSE
OK
OK
2E
3E
CONDITIONS
Ignition Switch
Position: 0
B
CONDITIONS
Ignition Switch
Position: 0
Wire
-
D
D
3E
D
Cruise Control Switch
On
1E
PROBLEM CAUSE
WY Wire
-
- B
Wire
Cruise Control Switch
-
PROBLEM CAUSE
OW Wire
-
- Body Electrical Control
Module (BECM)
RESULTS
Less than 1 ohm
D
RESULTS
Less than 1 ohm
D
Z249
Cruise Control Con-
verter/Inverter Module
C241D
B
Z238
Body Electrical
Control Module
(BECM)
C255
WY
CRUISE CONTROL
B5
21
TROUBLESHOOTING
Test F
OK
OK
PROBLEM CAUSE
OK
OK
3F
1F
2F
CONDITIONS
Ignition Switch
Position: II
BAT VOLT
GB
Wire
-
-
D
2F
Stop Lamp Switch
PROBLEM CAUSE
YP
Wire
-
- Stop Lamp Switch
RESULTS
Brake Pedal
D
Depressed
Released
=
=
0 V
CONDITIONS
Ignition Switch
Position: II
BAT VOLT
D
RESULTS
Brake Pedal
D
Depressed
Released
=
=
0 V
Z132
Engine Control Mod-
ule (ECM)
V
GP
Z132
Engine Control Mod-
ule (ECM)
V
YP
C572
C572
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