Diagnostic Manual, Chassis and Drivetrain,
Volume 2
Diagnosis - Diagnostic Trouble Code (DTC) Memory
Test Preparation for DTC Readout
1. Connect impulse counter scan tool or Hand-Held Tester to 38-pole data link connector (X11/4) as shown in section 0.
Note:
Connect yellow wire from impulse counter scan tool as follows:
ABS control module (N30) socket 6
2. Ignition: ON.
3. Read out DTC memory of ABS control module (N30). |
Equipment
| Hand-Held Tester (HHT) |
see applicable Service Information in groups 58
and 99. |
Diagnostic trouble code (DTC)
  |
Possible cause |
Test step/Remedy 1) |
  |
No faults recognized. In case of complaint: |
 23 (entire test) |
  |
Left front axle vehicle speed sensor (L6/1), open circuit |
23  7.0 |
 |
Right front axle vehicle speed sensor (L6/2), open circuit |
23 9.0 |
 |
Rear axle vehicle speed sensor (L6), open circuit |
23 11.0 |
 |
Left front axle solenoid valve (A7y1) |
23 13.0 |
 |
Right front axle solenoid valve (A7y2) |
23 14.0 |
 |
Rear axle solenoid valve (A7y3) |
23 15.0 |
| |
Return pump (A7m1) or return pump relay (A7k2) |
23 6.0 |
| |
Solenoid valve relay (A7k1) |
23 5.0 |
 |
ABS control module (N30) |
Replace N30. |
| |
Implausible signal, vehicle speed sensors (L6/1, L6/2, L6) 2) |
23 7.0, 9.0, 11.0,
Visual inspection. |
| |
Low battery voltage |
23 1.0 |
| |
Implausible signal, left front vehicle speed sensor (L6/1) 2) |
23 7.0 |
| |
Implausible signal, right front vehicle speed sensor (L6/2) 2) |
23 9.0 |
| |
Implausible signal, rear axle vehicle speed sensor (L6) 2) |
23 11.0 |
1) Observe Preparation for Test, see 22.
2) Rotor tooth count wrong or dirty/damaged, or wrong rear axle ratio, tires or wheels. |
|
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