Description - engine management (ENGINE MANAGEMENT SYSTEM - V8) (page 7 of 43)

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

-

-