1

Final stage, ignition module K20 / Ter. 4

2

Recognition ‑ 1 at gear S 53

3

Ground actuation for fuel pump relay K68 / Ter. 85 B

4

Ground actuation for idle speed adjuster M33

5

Ground actuation for tank vent valve Y 34

6

Unoccupied

7

Signal, hot‑wire mass air flow meter P44 / Ter. 3

8

Signal, Hall sensor cylinder recognition P47 / Ter. 2

9

Signal, odometer frequency sensor P 21

10

Ground Ter. 31

11

Signal, knock sensor

12

Voltage supply, Hall sensor P 47/Ter. 3; throttle valve potentiometer P 34/Ter. 1

13

Diagnostic excitation lead, diagnostic plug X13 / Ter. B

14

Ground Ter. 31

15

Unoccupied

16

Ground actuation for injection valve Y7, cylinder 3

17

Ground actuation for injection valve Y7, cylinder 1

18

Battery Ter. 30

19

Ground Ter. 31

20

Unoccupied

21

Ground actuation for charge pressure bypass valveY 12

22

Ground actuation for engine telltale

23

Unoccupied

24

Ground Ter. 31

25

Ground actuation for hot‑wire mass air flow meter  44 / Ter. 4, 'burn‑off' signal

26

Ground, hot‑wire mass air flow meter P44 / Ter. 2

27

Battery Ter. 15

28

Signal, oxygen sensor P32

29

Unoccupied

30

Ground supply for: knock sensor P46, coolant temperature sensor P12, intake air temperature sensor P29,  throttle valve potentiometer P34

31

Ground actuation for hot start valve

32

Tj signal for board computer

33

Unoccupied

34

Ground actuation for injection valve Y7, cylinder 2

35

Ground actuation for injection valve Y7, cylinder 4

36

Ground actuation for fuel pump relay K68 / Ter. 85

37

Voltage supply for: control unit K61, hot‑wire mass air flow meter P44 / Ter. 5

38

Unoccupied

39

Unoccupied

40

Input signal, air conditioning compressor

41

Input switch, air conditioning ready

42

Ground Ter. 31

43

Tachometer

44

Signal, Intake air temperature sensor P29

45

Signal, coolant temperature sensor P12

46

Unoccupied

47

Unoccupied

48

Signal, inductive pulse pick‑up P35 / Ter. 2

49

Ground, inductive pulse pick‑up P35 / Ter. 1

50

Unoccupied

51

Unoccupied

52

Recognition ‑ reverse gear

53

Signal, throttle valve potentiometer P34 / Ter. 3

54

Unoccupied

55

Bi directional data lead, diagnostic plug X13 / Ter. 6

Active

ECU Pin

Signal Name

Associated

Reference

Pin

Engine / Ignition

Conditions

During Test

Satisfactory

Readings

Related

Blink

Codes

1

IGNITION PULSE

2

Warm Idle . AT set to ‘P’ or ‘N’.

WARNING: HIGH VOLTAGES. Do not disconnect plug leads when Engine is Running. Ignition Pulse 8 to 10 Degrees of preset Advance.

NA

2

3

FUEL PUMP RELAY

24

Ignition ON

12V

53 & 54

Idle

4

IDLE AIR CONTROL VALVE (IAC)

24

Warm Idle . AT to ‘P’ or ‘N’.

Mark/Space ratio of pulses to be 32% to 60% to maintain correct idle speed (C30SE 570-730 rpm) (C30NE 670-830 rpm)

56 & 57

5

FUEL TANK VENT

24

Engine at Idle

12V

61 & 62

Accelerate Briefly.

0V Pulses (1 to 99%)

6

ENGINE SPEED SIGNAL

NA

7

AIR FLOW SENSOR

26

Warm Idle .

0.5V to 1.5V

73 & 74

Full Throttle

4.5V

8

HALL SENSOR (C30SE Only)

9

Warm Idle

Slow irregular change between 12V and 0V

93 & 94

9

DISTANCE SENSOR INPUT

19

Idle. Vehicle moved slowly forward then reverse.

Voltage changes slowly between 12V and 0V as vehicle moves.

NA

10

11

KNOCK SENSOR 1 (C30SE Only)

30

Hot Idle then increase rpm to >2000 for 10secs.

Check Blink Codes 16 or 18 are not set.

16 & 18

12

5V SUPPLY

19

Ignition ON.

5V

13

DIAGNOSTICS EXITATION

19

Ignition ON.

>11.5V (Battery Volts)

Pin ‘B’ of ‘Diagnostics’ socket (X13) connected to Pin ‘A’.

0V

14

15

16

INJECTION PULSES

14

Warm Idle

12V to 0V Pulse

25 & 81

MT

2.0ms To 2.8ms

AT

2.0ms To 3.0ms

17

INJECTION PULSES

14

Warm Idle

12V to 0V Pulse

25 & 81

MT

2.0ms To 2.8ms

AT

2.0ms To 3.0ms

18

FAULT MEMORY SUPPLY

19

Battery connected

Battery voltage (12V)

19

20

EXHAUST CODING (Not utilised)

19

Ignition ON.

5V on European cars. 0V on USA cars. (Due to ground connection forcing ‘Closed Loop’ mode)

21

TRANSMISSION CODING

19

Ignition ON.

NA

MT

5V

AT

0V

22

23

AC CUT-OFF RELAY

24

Warm Idle.

87 & 88

AC Switch set to ON.

12V

Increase engine speed to > 6000rpm.

0V

24

25

26

27

28

LAMBDA (O2 ) SENSOR

10

Warm Idle after 15 minutes fast drive.

Rapid change between 40mV and 1V at approx.1Sec intervals

38, 39 44 & 45

29

KNOCK SENSOR 2 (C30SE Only)

30

Hot Idle then increase rpm to >2000 for 10secs.

Check that Blink Codes 17 or 18 are not set.

17 & 18

30

31

HALL SENSOR SUPPLY (C30SE Only)

19

Ignition ON.

12V

NA

32

33

INTAKE VALVE (C30SEOnly)

Remove Intake Cover AT select ’P’ or ‘N’.

63

Warm Idle.

12V Intake Flap Closed.

Accelerate briefly to >4000 rpm.

0V Intake Flap Opens.

34

ENGINE LOAD SIGNAL (Output to AT)

19

Warm Idle .

1.8 to 2.5ms Pulses, Duration varied by position of Throttle Valve Potentiometer.

73, 74, 19 & 31

35

36

MAIN RELAY DRIVE PULSE

24

Ignition ON.

>11.5V (Battery Volts)

53 & 54

Idle.

37

BATTERY SUPPLY

19

Ignition ON.

>11.5V

48 & 49

Warm Idle .

13V to 15.9V

38

39

40

AC COMPRESSOR  ‘ON’ SIGNAL

19

Warm Idle.

AC Compressor OFF.

0V

AC Compressor ON.

12V

41

AIR CONDITIONING ‘ON’ SIGNAL (AC Only)

19

Warm Idle. AC Switch U7 set to:-.

ON

12V

OFF

0V

42

PARK/NEUTRAL SWITCH (AT Only)

19

Ignition ON. AT Selector set to:-

NA

‘P’ or ‘N’

0V

‘1’ ’2’ ‘3’ or ‘R’

12V

43

44

INTAKE TEMPERATURE

26

Warm Idle . Intake Air Temp erature :-

69 & 71

10 degrees C.

3.9V

50 degrees C

2.3V

45

COOLANT TEMPERATURE

26

Coolant Temp erature:-

14 &15

20 degrees C

3.5V

80 degrees C.

1.4V

53

THROTTLE VALVE POTENTIOMETER P 34/Ter. 1

Closed

0.4 V

Wide open

4 V