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Diagnostic Manual, Chassis and Drivetrain,
Volume 2

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LOCATION:    4.3 Automatic Locking Differential (ASD) - w/o Pressure Reservoir   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test step
DTC Test scope
Test connection
Test condition
Nominal value
Possible cause/Remedy
1.0 ASD control module (N30/2)
Voltage supply
Circuit 87 E

 

8

N30/2


 

14


Ignition: ON

11 - 14 V

1.1

1.1   Voltage supply from
overvoltage protection relay
module (K1/1 or K1/2)

 

N30/2


 

14



Ignition: ON


11 - 14 V
Fuse in K1/2,
Wiring,
K1/2,
1.2
1.2   Ground wire



W10




W16
W16/4
Models 124, 201



Models 129, 202




N30/2

8


N30/2

8
Ignition: OFF
< 1 Wiring,
Models 124, 201
Ground (battery) (W10).

Model 129
Ground (component compartment)
(W16).
Model 202
Ground (component compartment, right) (W16/4).
2.0   Circuit 61 voltage

 

8

N30/2


 

13



Ignition: ON

Engine: Start


< 1.5 V

11 - 14 V
Wiring,
Generator (G2).

3.0   Diagnosis output




5






26
X11/4 8-pole/16-pole
N30/2




X11/4 38-pole
N30/2






6






6
Engine: OFF



< 1



Wiring,
Data link connector (X11/4).
4.0   ASD warning lamp (A1e25)

 

8

N30/2


 

4

 



Ignition: ON


A1e25: ON
Wiring,
A1e25,
DM, Body & Accessories, Vol. 1, section 1.4, >23.
5.0   ASD MIL (A1e24)





8

 



8

Models 124, 129, 201

N30/2




Model 202

N30/2







2

 




2

Ignition: ON



Bridge sockets 8 and 2.


Ignition: ON



Bridge sockets 8 and 2.




A1e24: ON


A1e24: lamp goes out after 30 seconds.

A1e24: ON
Wiring,
A1e24.


Wiring.


Wiring,
A1e24,
DM, Body & Accessories, Vol. 1, section 1.4, >23.

6.0
Stop lamp switch (S9/1)
N.O. contact

 

8

N30/2


 

11

Ignition: OFF

Brake pedal not depressed.

Depress brake pedal.


< 1 V


11 - 14 V
Fuse in overvoltage protection relay module (K1/2),
Wiring,
S9/1.
7.0
Stop lamp switch (S9/1)
N.C. contact

 

8

N30/2


 

10

Ignition: ON

Brake pedal not depressed.

Depress brake pedal.


11 - 14 V


< 1 V
Wiring,
S9/1,
8.0

8.0
ASD solenoid valve (Y38)
Function

 

8

N30/2


 

10



Ignition: ON


Depress brake pedal.


ASD valve
switches on.

ASD valve switches off.
8.1,
Wiring.

8.1
Coil resistance


1
Y38x1


2

Ignition: OFF
Brake pedal not depressed.


5 - 7 .
Wiring,
Y38.
9.0
Right front axle VSS
sensor (L6/2)

 

8

N30/2



 

3

Raise front of vehicle.
Ignition: ON
Rotate right front wheel (approx. 1 rev./sec.).



> 3 V~
Wiring,
DM, Chassis & Drivetrain, Vol. 2, section 6.1-6.3 >23.
10.0
Left front axle VSS
sensor (L6/1)

 

8

N30/2


 

5

Raise front of vehicle.
Ignition: ON
Rotate left front wheel (approx. 1 rev./sec.).



> 3 V~

Wiring,
DM, Chassis & Drivetrain, Vol. 2, section 6.1-6.3 >23.
11.0
Rear axle VSS sensor (L6)

 

8

N30/2


 

1

Raise rear of vehicle.
Selector lever in: N
Ignition: ON
Rotate a rear wheel
(approx. 1 rev./sec.).




> 3 V~
Wiring,
DM, Chassis & Drivetrain, Vol. 2, section 6.1-6.3 >23.