Test program - Electrics

Testing

Scope of test

Measuring instrument/

Operation/requirement

Specified value

Possible cause/remedy

í

N A

test connector

1.0

4MATIC control module

N30/3

Cables

8
9

(N30/3)

Ground, battery (W10)

k

I0

Voltage supply

Ignition:

11-14 V

Fuse in K1/2

2

w

L

c

OFF

19

I I

Terminal 30a

Overvoltage protection relay (K1/2)

2.0

4MATIC control module

N30/3

Cables

8
9

(N30/3)

Fuse in K1/2

k

I0

Voltage supply

Ignition:

11-14 V

Overvoltage protection relay (K1/2)

2

w

L

c

ON

1

I I

Terminal 15 (fused, 87E)

Ignition/starter switch (S2/1)

3.0

Voltage, terminal 61

N30/3

Cables
Generator (G2)

k

Ignition:

<3 V

2

w

L

c

ON

11

Engine:

11-14 V

Idling

4.0

ADS/4MATIC warning lamp

N30/3

Ignition:

Cables

OFF

(A1e24) and diagnostic

Disconnect 4MATIC control

A1e24

k

output

2

9 module (N30/3)

u

Ignition:

A1e24: ON

ON

Test program - Electrics

Testing

Scope of test

Measuring instrument/

Operation/requirement

Specified value

Possible cause/remedy

í

N A

test connector

5.0

ASD/4MATIC function

N30/3

Ignition:

Cables

OFF

indicator lamp (A1e25)

Disconnect 4MATIC control

A1e25

k

2

module (N30/3)

u

24

Ignition:

A1e25: OFF

ON

6.0

Vehicles up to 04/91

N30/3

Oil pressure switch

k

(A7/2s1)

Engine:

<1,5 V

Cables

20

w

L

c

Idling

19

A/2s1

1.0

Service valve in position:

à

í

33

TEST

11-14 V

(refer to figure 4)

N30/3

Vehicle as of 05/91
Oil pressure switch

k

(A7/2s1) and normal

Engine:

<1,5 V

Cables

20

L

c

w

19

Idling

operation/service selection

A/2s1

switch (S7/3)

S7/3 in position: TEST

S7/3

1.0

(Figure 5)

11-14 V

à

í

33

7.0

Signal cable

N30/3

Cables

4MATIC - ABS

k

Ignition:

6-7 V

2

w

L

c

ON

23

Test program - Electrics

Testing

Scope of test

Measuring instrument/

Operation/requirement

Specified value

Possible cause/remedy

í

N A

test connector

8.0

Stop lamp switch, 4-pin

N30/3

Ignition:

Cables

3

ON

9

(S9/1)

S9/1

k

I0

(S9/1)

Do not

<1 V

2

w

L

c

operate brake

16

NO contact

Operate brake

11-14 V

9.0

Stop lamp switch, 4-pin

N30/3

Ignition:

Cables

3

ON

9

(S9/1)

S9/1

k

!0

(S9/1)

Do not

11-14 V

A7/2y3

2

w

L

c

operate brake

8

NC contact
Rear axle differential lock

Operate brake

<1 V

valve (A7/2y3)

10.0

Steering angle sensor

N30/3

Ignition:

I I

í

10.1

ON

(N49)

Cables

k

Signal

Turn steering wheel slowly

N49

17

-4.2 up to -5.0 V,

w

L

c

18

)

>

from right (in center position

0 V,
4.2 up to 5.0 V

to left lock

Voltage varies
with the steering
movement

10.1

Voltage supply

N30/3

Ignition:

Cables

OFF

Terminal 87E

Disconnect 4MATIC control

Overvoltage protection relay (K1/2)

k

unit (N30/3)

2

w

L

c

7

Ignition:

11-14 V

ON

Strona 1/4

© Daimler AG, 01.12.10, G/03/09 / dh0801pf00023x / 8.1 - 4MATIC 23 - Test program - Electrics Testing Model 124.2/3

Test program - Electrics

Testing

Scope of test

Measuring instrument/

Operation/requirement

Specified value

Possible cause/remedy

í

N A

test connector

11.0

Steering angle sensor

N30/3

Ignition: ON

I I

í

10.0

(N49)

k

Cables transposed

Turn steering wheel slowly

0-0.7 V

7

w

L

c

17

until the specified value on

7

w

L

c

18

both measuring devices is
achieved, then hold
securely

M

í

Carry out 12.0

immediately

Note on test connector:
Connecting diagram for

í

11.0
refer to

à

22 figure 2

12.0

Steering angle sensor

N30/3

I I

(N49)

k

Cables transposed

Ignition: ON

0-0.7 V

If -4,2 to -5,0 V, is displayed,

17

w

L

c

18

transpose connection 17 and 18 in

Turn steering wheel slowly

the plug connection, steering angle

to the left

4.2-5.0 V

sensor (N49x2)

13.0

Front left wheel speed

N30/3

Raise vehicle at the front

4

í

13.1

signal

Ignition: ON

Cables

k

from ABS control module

Turn left front wheel by

ABS control module (N30)

2

w

L

f

5

>3 V

(N30)

hand (approx. 1/second)

u

Front left speed sensor (L6/1)
4MATIC control module (N30/3)

Test program - Electrics

Testing

Scope of test

Measuring instrument/

Operation/requirement

Specified value

Possible cause/remedy

í

N A

test connector

13.1

Front left speed sensor

Notes on test connector:

L6/1

(L6/1)

Coaxial plug

L6/1x1

0.85-2.3 k

Ignition:

t

w

L

b

OFF

14.0

Front right wheel speed

N30/3

Raise vehicle at the front

5

í

14.1

signal

Ignition:

Cables

k

ON

from ABS control module

Turn front right wheel by

ABS control module (N30)

2

w

L

f

13

>3 V

(N30)

hand (approx. 1/second)

u

Front right speed sensor (L6/2)
4MATIC control module (N30/3)

14.1

Front right speed sensor

Notes on test connector:

L6/2

(L6/2)

Coaxial plug

L6/2x1

0.85-2.3 k

Ignition:

t

w

L

b

OFF

15.0

Rear wheel speed signal

N30/3

Raise vehicle at the front

6

í

15.1

from ABS control module

Ignition:

Cables

k

ON

(N30)

Turn rear wheel by hand

ABS control module (N30)

2

w

L

f

10

>3 V

(approx. 1/second)

u

Rear axle speed sensor (L6)
4MATIC control module (N30/3)

15.1

Rear axle speed sensor

L6x1

L6

0.85-2.3 k

(L6)

Ignition:

t

w

L

b

OFF

Test program - Electrics

Testing

Scope of test

Measuring instrument/

Operation/requirement

Specified value

Possible cause/remedy

í

N A

test connector

19.0

16.0

Front axle drive train valve

N30/3

Ignition:

A7/2y1 engages

8

í

OFF

Disconnect 4MATIC control

audibly

Cables

k

front wheels (A7/2y1)

2

module (N30/3)

Overvoltage protection relay (K1/2)

u

4

Function

Ignition:

A7/2y1

ON

19.0, 20.0

17.0

Center differential lock

N30/3

Ignition:

A7/2y2 engages

8

í

OFF

9

valve (A7/2y2)

Disconnect 4MATIC control

audibly

Cables

k

Function

2

module (N30/3)

Overvoltage protection relay (K1/2)

u

6

Ignition:

A7/2y2

ON

Strona 2/4

© Daimler AG, 01.12.10, G/03/09 / dh0801pf00023x / 8.1 - 4MATIC 23 - Test program - Electrics Testing Model 124.2/3

20.0

18.0

Rear axle differential lock

N30/3

Ignition:

A7/2y3 engages

9

í

OFF

I0

valve (Ay/2y3)

Disconnect 4MATIC control

audibly

Cables

k

Function

2

module (N30/3)

Stop lamp switch (4MATIC/ASD,

u

8

Ignition:

(S9/1)

ON

Overvoltage protection relay (K1/2)
A7/2y3

Test program - Electrics

Testing

Scope of test

Measuring instrument/

Operation/requirement

Specified value

Possible cause/remedy

í

N A

test connector

19.0

Front axle drive train valve

N30/3

Ignition:

Cables

8

OFF

9

(A7/2y1) and center

Disconnect 4MATIC control

A7/2y1

k

11-14

differential lock valve

module (N30/3)

A7/2y2

4

t

w

L

b

6

(A7/2y2)
Internal resistance

20.0

Center differential lock

N30/3

Ignition:

Cables

8

OFF

9

valve (A7/2y2) and rear

Disconnect 4MATIC control

Stop lamp switch (4MATIC/ASD)

k

I0

11-14

axle differential lock valve

module (N30/3)

(S9/1)

8

t

w

L

b

6

(A7/2y3)

A7/2y2

Internal resistance

A7/2y3

Test program - Electrics

Testing

Figure 1

Figure 2

Figure 3

N49x1/2

Plug connection, steering angle sensor

A7/2x1

Plug connection, 4MATIC valve control module

K31

Normal operation/service relay

(near jacket tube)

(below the rear right seat bench)

(below the right footrest)

Test program - Electrics

Testing

Figure 4

Figure 5

Figure 6

X62/8 Plug connection, rear axle distributor

15

Service valve

S7/3

Normal operation/Service selection switch (4MATIC)

(as of 05/91)

Test program - Electrics

Testing

Strona 3/4

© Daimler AG, 01.12.10, G/03/09 / dh0801pf00023x / 8.1 - 4MATIC 23 - Test program - Electrics Testing Model 124.2/3

Figure 7

Figure 8

Figure 9

X83/3 Connector, instrument cluster (CLUS)/

X4/10 Connector, terminal 30/terminal 61

X62/8 Connector, rear axle distributor

4MATIC warning lamp (3-pin)

Battery (3-pin) (in right of the wheelhouse

(to the right of the front-wall pillar)

(below the fuse and relay boxes (F1))

in front of battery)

Test program - Electrics

Testing

Assignment on coupling for 4MATIC control module
(N30/3)

Figure 10

1

Voltage supply from overvoltage protection relay 87E/87L/30a, 9-pin
(terminal 87E)

2

Ground, battery (W10)

-

3

4

Front axle drive train valve A7/2y1

5

Front left speed sensor (L6/1) signal from ABS control module (N30)

6

Center differential lock valve A7/2y2

7

Steering angle sensor N49 (-)

8

Rear axle differential lock valve A7/2y3

9

ASD/4MATIC diagnostic output/warning lamp (A1e24)

10

Rear axle speed sensor (L6) signal from ABS control module (N30)

11

Voltage, terminal 61

-

12
13

Right front speed sensor (L6/2) signal from ABS control module (N30)

-

14-15
16

Stop lamp switch, (4-pin) (S9/1), normally open contact

17-18

Steering angle sensor (N49) signal

19

Voltage supply from overvoltage protection relay 87E/87L/30a, 9-pin
(terminal 30a)

20

Oil pressure switch (A7/2s1)

-

21-22
23

ABS signal

24

ASD/4MATIC function indicator lamp (A1e25)

Strona 4/4

© Daimler AG, 01.12.10, G/03/09 / dh0801pf00023x / 8.1 - 4MATIC 23 - Test program - Electrics Testing Model 124.2/3