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Diagnostic Manual, Chassis and Drivetrain,
Volume 2

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LOCATION:    4.3 Automatic Locking Differential (ASD)   >   11 Diagnosis - Diagnostic Trouble Code (DTC) Memory


Diagnosis - Diagnostic Trouble Code (DTC) Memory

Preparation for DTC Readout

1. Connect impulse counter scan tool or Hand-Held Tester (HHT) to data link connector (X11/4) according to connection diagram (see section 0).
2. Engine: at Idle.
3. Read out DTC's for ASD control module (N30/2).

Note:
Connect yellow wire from impulse counter scan tool to:
ASD control module (N30/2)
  • 16-pole data link connector (X11/4) socket 5
  • 16-pole data link connector (X11/4) socket 26



To erase DTC's, Engine: at Idle.

Note:
To activate the DTC memory of a new ASD control module (N30/2),
see 12.

Equipment

Hand-Held Tester (HHT) See S.I. in groups 58 and 99.

Diagnostic trouble code (DTC) Possible cause Test step/Remedy 1)
   
No fault in system. In case of complaint: 23 and 33 (entire test)
ASD control module (N30/2). Replace N30/2.
Stop lamp switch (S9/1). 23 6.0
23 7.0
Left front axle VSS sensor (L6/1) or from ABS control module (N30). 23 10.0
Right front axle VSS sensor (L6/2) or from ABS control module (N30). 23 9.0
Rear axle VSS sensor (L6) or from ABS control module (N30). 23 11.0
No VSS from any sensor (L6, L6/1, L6/2). 23 9.0
23 10.0
23 11.0
ASD valve (Y38) or stop lamp switch (S9/1). 23 6.0
23 7.0
23 8.0
ASD without pressure reservoir (06/92 )
VSS (L6, L6/1, L6/2) 2)
Visually inspect
1) Observe Preparation for Test, see 22.
2) Rotor with incorrect tooth count, dirt accumulation on or damaged rotor, incorrect rear axle ratio, wrong wheel or tire size.