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Measured values, ECM connections

Measured values, ECM connections

Points to remember:


The measurements must be performed using a Breakout Box (BOB) connected between the ECM and the ECM's connector.

Several voltage levels must be regarded as guide values. Use common sense in assessing whether a measured value is correct or incorrect.

If any measured value is incorrect, use the electrical diagram to establish wheich leads, connectors or components should be checked more closely.

All the measured values apply to a warmed-up engine.

Unless otherwise stated, the ignition must be switched on

Indicated measured values relate to calibrated FLUKE 88/97


> = greater than ; < = less than ; » = approximately equal to; ∼ = AC voltage

Pins without further comments are not connected. (LP: LOGIC PROBE P=select pulse; p=visible pulses).


pins 1- 2

Colour

Component Function

In/Out

Measuring conditions

Between

Measured value

1

PK/WH

+30

in

Idling speed

Batt+ to 1

<0.5 V

2

GN/BK

Boost pressure control valve

out

900±50 rpm

1 - 2

1.3 V

2 - 25

90 Hz 17.5 %% (-) 1.9 ms (-) (LP HI LO)

1000-1500 rpm

1 - 2

» 0 V

2 - 25

90 Hz 2.0 %% (-) 0.2 ms (-) (LP LO)

3

GN/WH

Injector 1

out

900±50 rpm

1 - 3

0.2 V

3 - 25

7.5 Hz 2.5 ms (-) ( LOp)

4

BU/WH

Injector 2

out

900±50 rpm

1 - 4

0.2 V

4 - 25

7.5 Hz 2.5 ms (-) ( LOp)

5

VT/WH

Injector 3

out

900±50 rpm

1 - 5

0.2 V

5 - 25

7.5 Hz 2.5 ms (-) ( I LOp)

6

GY/WH

Injector 4

out

900±50 rpm

1 - 6

0.2 V

6 - 25

7.5 Hz 2.5 ms (-) ( HI LOp)

7

8

9

OG/BK

Trigger 1

out

900±50 rpm

1 - 9

1.2 V

9 - 25

7.5 Hz 8.3 %% (-) 11 ms (-) ( LOp)

10

GN/YE

Trigger 2

out

900±50 rpm

1- 10

1.2 V

10 - 25

7.5 Hz 8.3 %% (-) 11 ms (-) 11 ( LOp)

11

BU/RD

Trigger 3

out

900±50 rpm

1 - 11

1.2 V

11 - 25

7.5 Hz 8.3 %% (-) 11 ms (-) 11 ( LOp)

12

GY/RD

Trigger 4

out

900±50 rpm

1 - 12

1.2 V

12 - 25

7.5 Hz 8.3 %% (-) 11 ms (-) 11 ( LOp)

13

Torque limitation

in

13 - 25

Batt+

Gear-changing

13 - 25

0 V

14

DRIVE

in

P, N

14 - 25

0 V

R, D, 1, 2, 3

14 - 25

Batt+

15

VT

Brake light switch

in

brake pedal not depressed

15 - 25

0 V

brake pedal depressed

15 - 25

Batt+

16

17

YE/BN

Combustion cyl. 1 + 2

in

900±50 rpm

17 - 25

1.5 V 15-30 Hz ( HIp)

18

BN/RD

Combustion cyl. 3 + 4

in

900±50 rpm

18 - 25

1.5 V 15-30 Hz ( HIp)

19

20

PK

Pressure signal

out



20 - 67

1.0 V *)

21

YE/GY

Purge valve Diagnosis

in

ISAT activates purge valve in Trionic (EVAP)

21 - 25

6-7 V 8 Hz 50 %% (-) 60 ms (-) (HIp LOp)

22

BU/BN

Pressure sensor

in



22 - 67

100 kPa= 1.9 V see also technical data

23

GN

Oxygen sensor

in

900±50 rpm and warmed-up engine

23 - 47

0.1-0.9 V

24

BK

Main ground

in

900±50 rpm

24 - Batt-

<0.1 V

25

BK

Main ground

in

900±50 rpm

25 - Batt-

<0.1 V

26

BU

Boost pressure control valve

out

900±50 rpm

1 - 26

0 V

1000-1500 rpm

1 - 26

2.3 V

1000-1500 rpm

1 - 26

90 Hz 17.5 %% (-) 1.9 ms (-) (LP P HI LO)

27

YE/GY

Evaporative emission canister purge valve

out

ISAT activates purge valve in Trionic (EVAP)

21 - 25

6-7 V 8 Hz 50 %% (-) 60 ms (-) (LP HI LO)

28













29













30













31

BU/GY

MAIN RELAY

out

31 - 25

Batt+

ISAT activates IAC valve

32 - 25

0 V

32

YE/GN

CHECK ENGINE

out

32 - 25

<0.5 V

After 3 seconds

32 - 25

Batt+

33

GY/BK

Diagnosis

In/Out

ISAT not connected

33 - 25

» 6.5 V

ISAT connected

33 - 25

Batt+

34

35

YE/BK

Engine load signal AC and all consumers switched off

out

900±50 rpm

35 - 25

» 35 mV 30 Hz » 25 µs (+)

2500 rpm

35 - 25

» 65 mV 83 Hz » 40µs (+) (LP P HI )

36

BU/GN

Cruise control

in

36 - 25

Batt+

Activate diagnostic mode CC, press SET/RES

36 - 25

0 V

37

38

39

PK/BK

Speed signal

in

Rotate front right wheel 1/2 rev/second

39 - 25

5 V **) 15 Hz 50 %% (HIp LOp)

40













41

YE

Crankshaft position sensor

in

900±50 rpm

41 - 67

7-10 V∼ » 870 Hz (LP HI LO)

42

BN/WH

Throttle position sensor

out



42 - 67

5 V

43

GY

Pressure sensor

out



43 - 67

5 V

44

OG

Knocking signal

in

900±50 rpm

44 - 25

50-100 mV∼ (LP P LO)

45

GN/BN

Throttle position sensor

in



45 - 67

idling =0.5 V see also technical data

46

WH/BK

Intake air temperature sensor

in



46 - 67

40°C=1.5 V see also technical data

47

BK

Oxygen sensor, reference ground

in

900±50 rpm

25 - 47

<0.05 V

48

PK/WH

+30



900±50 rpm

Batt+ - 48

<0.5 V

49

BU/VT

Idle air control valve

out

900±50 rpm

1 - 49

3.5 - 5.5 V

AC and all power consumers switched off

49 - 25

500 Hz 25-45 %% 0.5-0.9 ms (LP HI LO)

50

BK/WH

Oxygen sensor, preheating

out

900±50 rpm

50 - 25

» 0.3 V

remove fuse No. 38

50 - 25

0 V

51

52

53

54

RD/WH

AC out

out

ISAT activates AC in Trionic

54 - 25

Batt+/<0.5 V

55

BU/YE

SHIFT UP

out



55 - 25

<0.5 V

56

WH

FUEL PUMP RELAY

out

56 - 25

Batt+



ISAT activates oxygen sensor preheating in Trionic

56 - 25

0 V

57

GN/OG

Throttle position signal

out

900±50 rpm

57 - 25

» 1 V 100 Hz 9 %% (+) 0.9 ms (+) (LP HI LO)

58

GN/RD

Engine speed signal

out

900±50 rpm

58 - 25

» 0.5 V 30 Hz (LP HI )

59

GN/GY

AC in

in

ISAT activates AC in ICE, ON

59 - 25

Batt+

ISAT activates AC in ICE, OFF

59 - 25

0 V

60

YE/GY

+15

in

Batt+ -60

<0.5 V

61













62



Production only









63



Production only









64













65



Production only









66

BK

Reference ground, coolant temperature sensor

in



66 - 25

<0.05 V

67

BK

Sensor ground

out



67 - 25

<0.05 V

68

YE/WH

Engine coolant temperature sensor

in



68 - 66

90°C = 0.41 V see also technical data

69













70















*) slightly lower value may be obtained when measuring at high altitude'

**) with car stationary: 0 V or approx. Batt+'