Range Rover 2. Electrical Manual - part 174

DATA LINK CONNECTOR

D3

2

CIRCUIT DIAGRAM

REV: 11/99

LGR

Z132
Engine Control
Module (ECM)

Z132
Engine Control
Module (ECM)

Z108
Anti–Lock Brake
System ECU

C0637

17

K

42

27 C0411

PR

GR

17

16

C0203

C0448

K

K

Petrol

Diesel

5

C1584
C0504

K

15

16

C0067
C0229

Z253
Heating
Ventilation and
Air Conditioning
Control Unit
(HEVAC)

2

3

C1576

KR

LGR

Z253
Heating Ventilation
and Air
Conditioning
Control Unit
(HEVAC)

6

7 C0793

KR

LGR

With Air
Conditioning

Without Air
Conditioning

KR

LGR

8

17

C1279

S214

S213

KR

LGR

X318
Data Link Connector
(OBDII)

7

15

C0040

Z238
Body Electrical
Control Module
(BECM)

32

TXD

RXD

LHD
RHD

KR

LGR

Z121
Cruise Control
ECU

16

C0239

C0162
C0448

KR

Diesel

DATA LINK CONNECTOR

D3

3

CIRCUIT DIAGRAM

Z238
Body Electrical
Control Module
(BECM)

C1287

1

51

15

C1321

Z255
Auto Gear Box
Control Unit

LG

12

KR

Diesel

31

Z255
Auto Gear Box
Control Unit

C1320

Diesel

Petrol

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

Ω

 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

Ω

  and for diesel engines 25.8

Ω

 .

When the fuel gauge sensors resistance value
increases to 175

Ω

  (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.