Discovery 2. Manual - part 70

 

  Index      Land Rover     Land Rover Discovery 2 - service manual 1999 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  68  69  70  71   ..

 

 

Discovery 2. Manual - part 70

 

 

ENGINE MANAGEMENT SYSTEM - V8

DESCRIPTION AND OPERATION

18-2-9

Pin out details connector C0634

Connector 2 (C0635): This connector contains 24 pins and is primarily used for Heated Oxygen Sensors (HO

2

S) 

control and earth. The HO

2

S sensors require a heater circuit to assist in heating the tip of the sensors to enable closed 

loop fuelling to be implemented quickly after cold starting.

Pin out details connector C0635

Pin No.

Function

Signal type

Reading

1

Ignition position II

Input

12 V

2

Not used

-

-

3

Not used

-

-

4

Chassis earth

Earth

0V

5

Fuel injectors earth

Earth

0V

6

Power stage earth

Earth

0V

7

Permanent battery supply

Input battery supply

12V

8

Switched relay  positive

Input switched

0-12V

9

Not used

-

-

Pin No.

Function

Signal type

Reading

1

HO

2

S heater RH bank - downstream

Output

PWM 12-0V

2

Not used

-

-

3

Not used

-

-

4

Not used

-

-

5

Thermostat monitoring sensor

Earth

0V

6

Not used

-

-

7

HO

2

S heater LH bank - downstream

Output

PWM 12-0V

8

HO

2

S sensor RH bank - downstream

Earth/ Signal

0V

9

HO

2

S sensor LH bank - upstream

Earth/ Signal

0V

10

HO

2

S sensor RH bank - upstream

Earth/ Signal

0V

11

HO

2

S sensor LH bank - downstream

Earth/ Signal

0V

12

Not used

-

-

13

HO

2

S heater RH bank - upstream

Output

PWM 12-0V

14

HO

2

S sensor RH bank - downstream

Input/ Signal

Analogue 0-5V

15

HO

2

S sensor LH bank - upstream

Input/ Signal

Analogue 0-5V

16

HO

2

S sensor RH bank - upstream

Input/ Signal

Analogue 0-5V

17

HO

2

S sensor LH bank - downstream

Input/ Signal

Analogue 0-5V

18

Fuel pump relay

Output

Switch to earth

19

HO

2

S heater LH bank - upstream

Output

PWM 12-0V

20

Not used

-

-

21

Thermostat monitoring sensor

Signal

Analogue 0-5V

22

Not used

-

-

23

Main relay

Output

Switch to earth

24

EVAP system leak detection pump motor (NAS 
vehicles with positive pressure type, EVAP system 
leak detection capability only)

Output

Switch to earth

ENGINE MANAGEMENT SYSTEM - V8

18-2-10 DESCRIPTION AND OPERATION

Connector 3 (C0636): This connector contains 52 pins and is used for most sensor and actuator inputs and outputs. 
Sensor and actuator control is vital to ensure that the ECM maintains adaptive strategy

Pin out details connector C0636

Pin No.

Function

Signal type

Reading

1

Injector cylinder number 2

Output

Switch to earth

2

Injector cylinder number 5

Output

Switch to earth

3

Purge valve

Output, signal

PWM 12-0V

4

SAI vacuum solenoid valve (NAS vehicles from 2000MY 
only)

Output

Switch to earth

5

Not used

-

-

6

Fuel tank pressure sensor (NAS vehicles with vacuum type, 
EVAP system leak detection only)

Earth

0V

7

MAF sensor 5V supply

Output, reference

5V

8

Not used

-

-

9

MAF sensor earth

Earth

0V

10

TP sensor 5V supply

Output, reference

5V

11

Not used

-

-

12

Not used

-

-

13

Not used

-

-

14

Injector cylinder number 7

Output

Switch to earth

15

Injector cylinder number 6

Output

Switch to earth

16

SAI pump relay (NAS vehicles from 2000MY only)

Output

Switch to earth

17

CMP sensor

Earth

0V

18

Low range switch (manual transmission only)

Input, signal

Active low

19

Not used

-

-

20

CMP signal

Input, signal

Digital switch 0-12V

21

ECT sensor

Earth

0V

22

Coolant temperature signal

Input, signal

Analogue 0-5V

23

MAF sensor signal

Input, signal

Analogue 0-5V

24

TP sensor signal

Input, signal

Analogue 0-5V

25

TP sensor earth

Earth

0V

26

Not used

-

-

27

Injector cylinder number 3

Output

Switch to earth

28

Injector cylinder number 8

Output

Switch to earth

29

Hill decent control output

Output, signal

PWM 0-12V

30

EVAP canister vent solenoid (CVS) valve (NAS vehicles with 
vacuum type, EVAP system leak detection only)

Output

Switch to earth

30

Leak detection pump solenoid (NAS vehicles with positive 
pressure type, EVAP system leak detection only)

Output

Switch to earth

31

A/C condenser fan

Output

Switch to earth

32

CKP sensor signal

Input, signal

Analogue, 0-300V peak

33

Not used

-

-

34

IAT sensor signal

Input, signal

Analogue 0-5V

35

KS, RH bank earth

Earth

0V

36

KS, RH bank signal

Input, signal

Analogue

37

Not used

-

-

38

Not used

-

-

39

Not used

-

-

40

Injector cylinder number 4

Output

Switch to earth

41

Injector cylinder number 1

Output

Switch to earth

42

Idle air control valve open

Output, signal

PWM 12-0V

43

Idle air control valve close

Output, signal

PWM 12-0V

44

ECT sensor signal

Output, signal

PWM 0-12V

ENGINE MANAGEMENT SYSTEM - V8

DESCRIPTION AND OPERATION 18-2-11

45

CKP sensor earth screen

Earth

0V

46

CKP sensor signal

Earth reference

0V

47

Not used

-

-

48

KS, LH bank earth

Earth

0V

49

KS, LH bank signal

Input, signal

Analogue

50

Not used

-

-

51

Not used

-

-

52

Not used

-

-

Pin No.

Function

Signal type

Reading

ENGINE MANAGEMENT SYSTEM - V8

18-2-12 DESCRIPTION AND OPERATION

Connector 4 (C0637): This connector contains 40 pins and facilitates use of TestBook via the Diagnostic connector. 
Also contained in this connector is the Malfunction Indicator Lamp (MIL), this instrument panel lamp informs the driver 
of concerns within the engine management system.

Pin out details connector C0637

Pin No.

Function

Signal type

Reading

1

Not used

-

-

2

Not used

-

-

3

Not used

-

-

4

Not used

-

-

5

Not used

-

-

6

Not used

-

-

7

Not used

-

-

8

Low fuel level

Input, signal

Active high

9

Fuel tank pressure sensor (NAS vehicles with 
vacuum type, EVAP system leak detection 
capability only)

Output, reference

5V

10

Not used

-

-

11

Not used

-

-

12

Analogue fuel level (NAS vehicles with positive 
pressure type, EVAP system leak detection only)

Input, signal

0-5V

13

Not used

-

-

14

Fuel tank pressure sensor (NAS vehicles with 
vacuum type, EVAP system leak detection 
capability only)

Input, signal

Analogue 0-5V

15

Not used

-

-

16

ATC compressor request

Input, signal

Active low

17

Engine speed output

Output, signal

PWM 0-5V

18

Not used

-

-

19

Not used

-

-

20

Malfunction indicator lamp 'ON'

Output

Switched earth

21

Not used

-

-

22

Vehicle speed signal (VSS)

Input, signal

PWM 0-12V

23

Not used

-

-

24

Not used

-

-

25

Not used

-

-

26

Not used

-

-

27

Not used

-

-

28

Not used

-

-

29

ATC compressor relay

Output

Switched earth

30

Not used

-

-

31

Positive pressure type EVAP system heater (02MY 
vehicles only)

Output, drive

Switched earth

32

Diagnostic connector K-line

Bi-directional

Serial 0-12V

33

Immobiliser serial W link

Input, signal

Serial 0-12V

34

Rough road signal

Input, signal

PWM 0-12V

35

Not used

-

-

36

CAN data bus 'high line'

Bi-directional

5-2.5V

37

CAN data bus 'low line'

Bi-directional

0-2.5V

38

ATC stand by

Input, signal

Active low

39

Not used

-

-

40

Not used

-

-

 

 

 

 

 

 

 

Content   ..  68  69  70  71   ..