STI Home
Diagnostic Manual, Chassis and Drivetrain,
Volume 2

 Printable version
LOCATION:    4.1 Automatic Locking Differential (ASD)   >   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 (K1/2)

 

N30/2


 

14



Ignition: ON


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



W10
W16






N30/2

7
8
9



Ignition: OFF



< 1
Wiring,
Model 124, 201
Ground (W10),
Model 129
Ground (W16).
2.0   Circuit 61 voltage

 

8

N30/2


 

13



Ignition: ON

Engine: at Idle


< 2 V

11 - 14 V
Wiring,
Generator (G2).

3.0   Diagnosis output

X11/4
5
N30/2




2


Engine: OFF





< 1



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

 

8

N30/2


 

4



Ignition: ON


A1e25: ON
Wiring,
Fuse,
A1e25,
Bulb.
5.0   ASD MIL (A1e24)

 

8

N30/2



 

2



Ignition: ON

Bridge sockets 8 and 2.
Engine: at Idle


A1e24: ON


A1e24: OFF
Wiring,
Fuse,
A1e24.


Wiring.
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 F1,
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 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 Y38x1


2

Ignition: OFF
Brake pedal not depressed.


5 - 7
Wiring,
Y38.
9.0
Left front VSS




7
8
9
N30/2







5 5 5
Raise front of vehicle.
Ignition: ON
Rotate left front wheel (approx. 1 rev./sec.).


> 3 V~
Wiring,
9.1.
9.1   ABS control module (N30)
left front VSS output
N30
20


N30 17
Raise front of vehicle.
Ignition: ON
Rotate left front wheel (approx. 1 rev./sec.).


> 3 V~

9.2.
9.2   Left front VSS sensor (L6/1)
N30
6


N30
4
Raise front of vehicle.
Ignition: ON
Rotate left front wheel (approx. 1 rev./sec.).


> 0.1 V~
Wiring,
9.3.
9.3   Internal resistance
N30
20


N30 6
Ignition: OFF
Disconnect ABS control module (N30).

> 20 k
Wiring,
9.4.
9.4   Internal resistance
N30
6


N30 4
Ignition: OFF
Disconnect ABS control module (N30).


0.8 - 2.3 k
Wiring,
L6/1.
10.0
Right front VSS




7
8
9
N30/2







3 3 3
Raise front of vehicle.
Ignition: ON
Rotate right front wheel (approx. 1 rev./sec.).


> 3 V~
Wiring,
10.1.
10.1   ABS control module (N30)
right front VSS output
N30
20


N30 11
Raise front of vehicle.
Ignition: ON
Rotate right front wheel (approx. 1 rev./sec.).


> 3 V~

10.2.
10.2   Right front VSS sensor (L6/2)
N30
23


N30 21
Raise front of vehicle.
Ignition: ON
Rotate right front wheel (approx. 1 rev./sec.).


> 0.1 V~
10.3.
10.3   Internal resistance
N30 20


N30 23
Ignition: OFF
Disconnect ABS control module (N30).

> 20 k
Wiring,
10.4.
10.4   Internal resistance
N30
23


N30 21
Ignition: OFF
Disconnect ABS control module (N30).


0.8 - 2.3 k
Wiring,
L6/2.
11.0
Rear axle VSS




7
8
9
N30/2







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


> 3 V~
Wiring,
11.1.
11.1   ABS control module (N30)
rear axle VSS output
N30
20


N30 30
Raise front of vehicle.
Ignition: ON
Rotate either rear wheel (approx. 1 rev./sec.).


> 3 V~

11.2.
11.2   Rear axle VSS sensor (L6)
N30
7


N30
9
Raise front of vehicle.
Ignition: ON
Rotate either rear wheel (approx. 1 rev./sec.).


> 0.1 V~
11.3.
11.3   Internal resistance
N30
20


N30 7
Ignition: OFF
Disconnect ABS control module (N30).

> 20 k
Wiring,
11.4.
11.4   Internal resistance
N30
7


N30 9
Ignition: OFF
Disconnect ABS control module (N30).


0.6 - 1.6 k
Wiring,
L6.