Range Rover 2. Electrical Manual - part 18

CRUISE CONTROL (DIESEL)

B5

10

CIRCUIT DIAGRAM

Z108
Anti–Lock Brake
System ECU

C116R

28

11

C114

YG

Z238
Body Electrical
Control Module
(BECM)

C258

13

9

Y

C227

29

1

X168
Stop Lamp
Switch

[1]

Brake Pedal
Depressed

C227

2

YP

[1]

[1]

3

0

0

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

14

C571

20

26

3

680 

31

2

S106

14

C202

C121

C102

9

C202
C102

S201

K152
Resistor

S104

Diesel

Diesel

CRUISE CONTROL (DIESEL)

B5

11

CIRCUIT 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

UB

Automatic
Transmission

C230

C626

3

20

Manual
Transmission

P

0

1

1

R

0

0

1

N

1

0

1

D

1

0

0

3

0

0

0

2

0

1

0

1

1

1

0

Z*

1

1

1

X

Y

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

6

10

18

C626

UG

3

[3]

0

C562

C659
C559

5

C560

S608

S609

S610

Automatic
Gearbox

C560

C660

C255

X

Y

Z

Automatic Transmission

Diesel

Switch Open

Switch Closed

Fault

*  =

0 =

 1=

S603

Automatic
Gearbox

35

NY

34

Z132
Engine Control
Module (ECM)

C603

28

4

C560
C660

3

C572

UN

C581
C551

Manual Transmission

UN

CRUISE CONTROL

B5

TROUBLESHOOTING HINTS

12

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.

CRUISE CONTROL

B5

13

TROUBLESHOOTING

Test A

OK

OK

OK

OK

3A

1A

2A

CONDITIONS

Ignition Switch

Position: II

CONDITIONS

Ignition Switch

Position: 0

D

D

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

D

OW

RESULTS

V

B

Within 1.5V of battery voltage

RESULTS