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SCHEMATICS AND DIAGRAMS SYSTEM CONNECTORS The V-MAC IV system utilizes many different connector styles and sizes. The Engine Management System (EMS) Module, Instrument Cluster Module (ICM), and the Vehicle Electronic Control Unit (VECU) are some of the largest connectors in the system. These connectors and control units are where the majority of the V-MAC IV system testing is performed. This section illustrates the EMS Module, ICM, and Vehicle Electronic Control Unit (VECU) connectors and includes charts with connector terminal identification and functions. The charts should not be used as a replacement for the detailed tests that appear in this manual. The charts are intended as an identification reference for use when repairing a connector or terminal.

Engine Management System (EMS) Module The Engine Management System (EMS) Module has two 62 pin connectors. To disconnect a connector from the EMS Module, pull back on the connector lock and gently pull the connector back on its heel and away from the EMS Module. For easy reference, the following illustration shows each pin number as it appears on the connector. Be sure that the connector is aligned as shown below to avoid confusion when checking pin numbers. The connector numbers and EMS Module orientation are shown as a reference for reconnecting the EMS Module to the engine harness.

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Figure 507 — EMS Connectors

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SCHEMATICS AND DIAGRAMS ENGINE MANAGEMENT SYSTEM (EMS) MODULE EMS Module Connector A PIN Number

Description

EMS Module Connector A PIN Number

Description

37

Crank speed sensor (-)

38

Crank speed sensor (+)

1

Not used

39

Fan speed sensor (-)

2

Not used

40

Spill Valve (SV) injector 6 (output)

3

Water In Fuel Filter (WIFF) valve

41

Turbo speed sensor (+)

4

Not used

42

Turbo speed sensor (-)

5

Not used

43

Humidity temp signal

6

Not used

44

7

5 volt reference signal

Needle Control Valve (NCV) injector 5 (output)

8

Not used

45

CAM speed sensor (+)

9

Not used

46

CAM speed sensor (-)

47

Boost temperature signal

48

Spill Valve (SV) injector 5 (output)

49

Not used

50

Not used

10

Not used

11

5 volts reference ground

12

Needle Control Valve (NCV) injector 2 (output)

13

Not used

51

Not used

14

Not used

52

15

Not used

Needle Control Valve (NCV) injector 4 (output)

16

Spill Valve (SV) injector 2 (output)

53

Not used

54

Not used

55

Not used

56

Spill Valve (SV) injector 4 (output)

57

Ground (-)

58

Not used

59

Spill Valve (SV) common 1,2,3 injectors

60

Spill Valve (SV) common 4,5,6 injectors

61

Needle Control Valve (NCV) injector common 4,5,6 injectors

62

Needle Control Valve (NCV) injector common 1,2,3 injectors

17

Not used

18

Not used

19

Not used

20

NCV injector 1 (output)

21

Not used

22

Boost pressure signal

23

Humidity sensor signal

24

Spill Valve (SV) injector 1 (output)

25

Not used

26

Not used

27

Not used

28

Needle Control Valve (NCV) injector 3 (output)

29

Not used

30

Not used

31

Oil Temperature signal

32

Spill Valve (SV) injector 3 (output)

33

J1708/J1587B

34

J1708/J1587A

35

Fan speed sensor (+)

36

Needle Control Valve (NCV) injector 6 (output)

January 2009

Page 515

SCHEMATICS AND DIAGRAMS EMS Module Connector B

EMS Module Connector B PIN Number

Description

PIN Number

Description

1

Not used

39

2

Not used

40

Not used

3

Oil level (supply)

41

Not used

4

Oil level (ground)

42

Not used

5

Not used

43

Not used

6

Not used

44

Not used

7

Not used

45

Not used

8

WIFF switch (+) input

46

Not used

9

EGR valve (-)

47

Not used

10

Switched ground for WIFF and coolant level

48

Not used

49

Electronic fan clutch (-) out

11

Oil pressure signal

50

Not used

12

Not used

51

J1939 High

13

EGR valve (+)

52

VGT valve and EGR J1939 CAN 2 (+)

14

Not used

53

Not used

15

Buffer IVS

54

Not used

16

Fuel pressure signal

55

J1939 Low

17

Oil pressure (+), crank press (+), fuel press (+)

56

VGT valve and EGR J1939 CAN 2 (-)

18

Coolant temp (-), oil press (-), crank press (-), fuel press (-)

57

Engine Management System (EMS) Module power supply

19

Not used

58

EMS Module Ground

20

Not used

59

EMS Module Ground

21

Not used

60

EMS Module power supply

22

Not used

61

EMS Module Ground

62

Not used

23

Coolant level warning (+) input

24

Not used

25

Not used

26

Not used

27

Coolant temperature (+) input

28

Crankcase pressure signal

29

Not used

30

Engine compression brake (-) output

31

Oil level (ground)

32

Not used

33

Not used

34

Not used

35

Not used

36

Not used

37

Not used

38

Not used

Page 516

Not used

January 2009