Test Point 4

DTC 14

Transverse Lock, Deviation

During the transverse lock regulating phase, the monitoring circuit in the PSD/ABS control unit has identified excessive variations between the nominal and actual values.

Possible faults

- Lock control circuit poorly bled (lock operation hydraulics).

- Lock hydraulics leaking.

- Lock solenoid valve has a mechanical defect.

- Lock cylinder does not retain preset pressure (leaking through relief bore).

- Inadequate signal from a rear wheel speed sensor.

- Fault in transverse lock plates.

- Insufficient hydraulic pressure builds up at plates, e.g. because thrust-bearing bolt of engaging lever is wrongly adjusted (engaging lever makes contact).

Procedure

1. Check lock hydraulics for external leaks. Replace defective parts if necessary.

2. Repeat bleeding procedure for lock control circuit (lock hydraulics). If new parts have been installed, the lock must be bled, Service and Repair

3. Check speed sensor signals, Test Point 6

4. Measure thickness of plates with lock measuring cylinder (special tool 9514), Measuring Differential Plate Wear

5. Check pressure at locking torque (friction value of the lock), Checking Locking Torque