Range Rover 2. Electrical Manual - part 29

 

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Range Rover 2. Electrical Manual - part 29

 

 

INSTRUMENTS

E1

CIRCUIT OPERATION

1

CIRCUIT OPERATION

Engine Coolant Temperature Gauge

The engine coolant temperature gauge sensor has
the capability to sense from –40

_

C to +130

_

C. Petrol

and Diesel resistance valves are different.

Both Petrol and Diesel sensors are interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238). The
resistance value then being represented by an A/D
data transfer generating the required angular
deflection on this gauge. 

         

]

Fuel Gauge

When the fuel tank level is low (“E”), the resistance
value of the gauge sensor is 270

 for petrol and

diesel engines. As the fuel level increases, the
resistance of the sensor decreases. When the fuel
tank is full, the resistance value of the sensor for
petrol engines is 19

  and for diesel engines 25.8

 .

When the fuel gauge sensors resistance value
increases to 175

  (9 liters/2.25 US gallons, the low

fuel warning light will illuminate to warn of the fuel
status. Both Petrol and Diesel sensors are interfaced
to the Instrument Cluster (Z142) via the BeCM
(Z238). The resistance values then being
represented by an A/D data transfer generating the
required angular deflection on the gauge.

Speedometer

The signal to activate the gauge is originated at the
ABS wheel sensors, transmitted to the ABS ECU
(Z108) which then puts out a usable signal to the
Instrument Cluster (Z142) of 8000 pulses per mile or
4972 pulses per kilometer. The signal is also
transmitted to other ECU’s, such as the Engine
Control Module (ECM) (Z132) and the Cruise Control
ECU (Z121).

Tachometer

The tachometer will display the engine speed in
R.P.M. It will derive the engine speed from the
engine speed pulse train transmitted from the Engine
Control Module (ECM) (Z132).

The pulse rate for petrol engines will be 4 pulses per
engine revolution.

The pulse rate for diesel engines will be 3 pulses per
engine revolution.

Audible Warning

Receipt of an audible warning request signal from a
vehicle parameter/message condition shall cause the
BeCM (Z238) to generate the required number of
warning tones. The actuator sounder unit is located
at the rear of the Instrument Cluster (Z142).

See message listing for categories/priority and levels
of audible warnings.

INSTRUMENTS

E1

2

CIRCUIT DIAGRAM

LG

LG

5

7

C258

17

14

[15]

4

C242

B

S205

See Fuse Details

30

F 1

10 A

7

B

8

BG

14

18

BG

5

2

2

12

10

RG

RG

1

13

9

OG

OG

E254

P

P

3

C242

11

15

3

C256

9

Y

YG

11 C114

Z238
Body Electrical
Control Module
(BECM)

Z142
Instrument
Cluster
[1]

Speedome-
ter

[15] Control

Unit and
Message
Centre Dis-
play

Z108
Anti–Lock Brake
System ECU

Z238
Body Electrical
Control Module
(BECM)

[1]

28

C116R

C116L

LHD

RHD

16

INSTRUMENTS

E1

3

CIRCUIT DIAGRAM

Z142
Instrument
Cluster
[2]

Tachometer

[3]

Fuel Gauge

[15] Control

Unit and
Message
Centre Dis-
play

Z238
Body Electrical
Control Module
(BECM)

Z132
Engine Control
Module (ECM)

Z132
Engine Control
Module (ECM)

Z134
Fuel Pump Mod-
ule
[1]

Fuel Level
Sensor

10

16

C242

15

8

C256

BK

S

10

C114

GB

1

C110

2

C110

B

S115

E167

23

C505

S

2

C106B

C506B

2

C106A

C506A

NAS

Except NAS

Petrol

Diesel

50

C572

20

C121

C571

S

9

C112

[2]

[3]

[15]

[1]

See Ground Dis-
tribution

INSTRUMENTS

E1

4

CIRCUIT DIAGRAM

[4]

Z142
Instrument
Cluster
[4]

Tempera-
ture Gauge

Z238
Body Electrical
Control Module
(BECM)

C114

19

G

Petrol

Diesel

C106

8

C506

C519

1

X114
Engine Coolant
Temperature
Gauge Sensor

C588

1

X114
Engine Coolant
Temperature
Gauge Sensor

2

B

E529

C519

See Ground Dis-
tribution

S505

C588

1

X114
Engine Coolant
Temperature
Gauge Sensor

C121

12

C571

2

E167

C588

C571

6

C121

S115

up to model year
97

from model year
98

B

 

 

 

 

 

 

 

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