 |
  |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
 
|
4MATIC control
module (N30/3)
Voltage supply
Circuit 30a |
2  |
N30/3
 |
 19 |
Ignition: OFF |
11 - 14 V |
Wiring,
Ground (battery) (W10),
Fuse in K1/2,
Overvoltage protection relay
module (K1/2).
|
| 2.0 |
|
4MATIC control
module (N30/3)
Voltage supply
Circuit 15 (fused, 87E) |
2 |
N30/3
|
1 |
Ignition: ON |
11 - 14 V |
Wiring,
Fuse in K1/2,
K1/2,
Ignition switch (S2/1).
|
| 3.0 |
|
Voltage circuit 61 |
2 |
N30/3
|
11 |
Ignition: ON
Engine: at idle
|
< 3 V
11 - 14 V |
Wiring,
Generator (G2). |
| 4.0 |
|
ASD/4MATIC (MIL) (A1e24) and diagnostic output |
2
|
N30/3
 |
9
|
Ignition: OFF
Unplug 4MATIC control module (N30/3).
Ignition: ON
|
A1e24: ON |
Wiring,
A1e24. |
| 5.0 |
|
ASD/4MATIC warning lamp (A1e25) |
2
|
N30/3
|
24
|
Ignition: OFF
Unplug 4MATIC control module (N30/3).
Ignition: ON
|
A1e25: ON |
Wiring,
A1e25.
|
| 6.0 |
|
Vehicles up to 04/91
Oil pressure switch (A7/2s1) |
20 |
N30/3
|
19 |
Engine: At idle
Service valve in TEST position (see Figure 4)
|
< 1.5 V
11 - 14 V |
Wiring,
A7/2s1,
 33 1.0
|
| |
|
Vehicles as of 05/91
Oil pressure switch (A7/2s1) and 4MATIC function/test selection switch (S7/3) |
20 |
N30/3
|
19 |
Engine: At idle
S7/3 in TEST position (see Figure 5) |
< 1.5 V
11 - 14 V |
Wiring,
A7/2s1,
S7/3,
33 1.0
|
| 7.0 |
|
4MATIC - ABS Signal line |
2 |
N30/3
|
23 |
Ignition: ON
|
6 - 7 V |
Wiring. |
| 8.0 |
|
Stop lamp switch (S9/1)
N. O. contact |
2 |
N30/3
|
16 |
Ignition: ON
Brakes not applied
Brakes applied
|
< 1 V
11 - 14 V
|
Wiring,
S9/1. |
| 9.0 |
|
Stop lamp switch (S9/1)
N. C. contact
Rear axle differential lock
valve (A7/2y3) |
2 |
N30/3
|
8 |
Ignition: ON
Brakes not applied
Brakes applied
|
11 - 14 V
< 1 V
|
Wiring,
S9/1,
A7/2y3. |
| 10 |
|
Steering angle
sensor (N49)
Signal |
17 |
N30/3
|
18 |
Ignition: ON
Slowly turn steering wheel from right stop to
(center position  )
to left stop.
|
-4.2 to -5.0 V
0 V
4.2 to 5.0 V
Voltage varies with steering movement.
|
10.1,
Wiring,
N49. |
| 10.1 |
|
Voltage supply
Circuit 87E |
2 |
N30/3
|
7 |
Ignition: OFF
Unplug 4MATIC control module (N30/3).
Ignition: ON
|
11 - 14 V |
Wiring,
Overvoltage protection relay
module (K1/2). |
| 11.0 |
|
Steering angle
sensor (N49)
Wiring reversed |
7
7
|
|
17
18
|
Ignition: ON
Turn steering wheel slowly until nominal value is reached on both meters, then hold securely.
Perform 12.0 immediately.
Note:
For 11.0 see 22 Figure 2 for connection diagram.
|
0 - 0.7 V |
10.0
|
| 12.0 |
|
Steering angle
sensor (N49)
Wiring reversed |
17 |
N30/3
|
18 |
Ignition: ON
Turn steering wheel slowly to the left
|
0 - 0.7 V
4.2 - 5.0 V |
If a reading of -4.2 to -5.0 V is obtained, connection 17 and 18 in the steering angle sensor connector (N49x2) are reversed.
|
| 13.0 |
 |
Left front vehicle speed signal (VSS)
from ABS control
module (N30) |
2 |
N30/3
 |
5 |
Lift front of vehicle.
Ignition: ON
Turn left front wheel by hand (approx. 1 rev. per sec.)
|
> 3 V~ |
13.1,
Wiring,
ABS control module (N30),
Left front axle VSS sensor (L6/1),
4MATIC control module (N30/3).
|
| 13.1 |
|
Left front axle VSS
sensor (L6/1) |
|
L6/1x1
(coaxial connector) |
|
Ignition: OFF
|
0.85 - 2.3 k
|
L6/1.
|
| 14.0 |
 |
Right front vehicle speed signal (VSS)
from ABS control
module (N30) |
2 |
N30/3
|
13 |
Lift front of vehicle.
Ignition: ON
Turn right front wheel by hand (approx. 1 rev. per sec.) |
> 3 V~ |
14.1,
Wiring,
ABS control module (N30),
Right front axle VSS
sensor (L6/2),
4MATIC control module (N30/3). |
| 14.1 |
|
Right front axle VSS
sensor (L6/2) |
|
L6/2x1
(coaxial connector) |
|
Ignition: OFF |
0.85 - 2.3 k |
L6/2.
|
| 15.0 |
 |
Rear vehicle speed
signal (VSS)
from ABS control
module (N30) |
2 |
N30/3
|
10 |
Lift front of vehicle.
Ignition: ON
Turn rear wheel by hand (approx. 1 rev. per sec.)
|
> 3 V~ |
15.1,
Wiring,
ABS control module (N30),
Rear axle VSS sensor (L6),
4MATIC control module (N30/3). |
| 15.1 |
|
Rear axle VSS sensor (L6) |
|
L6x1
|
|
Ignition: OFF
|
0.85 - 2.3 k
|
L6.
|
| 16.0 |
|
Front axle drivetrain
valve (A7/2y1)
Operation |
2
|
N30/3
|
4
|
Ignition: OFF
Unplug 4MATIC control module (N30/3).
Ignition: ON
|
A7/2y1 actuates audibly |
19.0,
Wiring,
Overvoltage protection relay
module (K1/2),
A7/2y1.
|
| 17.0 |
|
Central differential lock
valve (A7/2y2)
Operation |
2
|
N30/3
|
6
|
Ignition: OFF
Unplug 4MATIC control module (N30/3).
Ignition: ON
|
A7/2y2 actuates audibly
|
19.0, 20.0,
Wiring,
Overvoltage protection relay
module (K1/2),
A7/2y2.
|
| 18.0 |
|
Rear axle differential lock valve (A7/2y3)
Operation |
2
|
N30/3
|
8
|
Ignition: OFF
Unplug 4MATIC control module (N30/3).
Ignition: ON
|
A7/2y3 actuates audibly
|
20.0,
Wiring,
Stop lamp switch (S9/1),
K1/2,
A7/2y3.
|
| 19.0 |
|
Front axle drivetrain valve
(A7/2y1) and central
differential lock
valve (A7/2y2)
Internal resistance
|
4 |
N30/3
|
6 |
Ignition: OFF
Unplug 4MATIC control module (N30/3).
|
11 - 14 |
Wiring,
A7/2y1,
A7/2y2.
|
| 20.0 |
|
Central differential lock valve (A7/2y2) and rear axle differential lock
valve (A7/2y3)
Internal resistance
|
8 |
N30/3
|
6 |
Ignition: OFF
Unplug 4MATIC control module (N30/3). |
11 - 14 |
Wiring,
Stop lamp switch (S9/1),
A7/2y2,
A7/2y3. |
Printable version
