6.4.3. Instruction on PBS repair (Protivobuksovochny system)
The Protivobuksovochny system is delivered only with ABS of 5.3/PBS, ABS of 8.0 CCDs and the Z 18 XE engine. The most important input parameter of PBS is the signal of a speedometer of the ABS wheel sensor.
The passable way pays off from among turns of a wheel and external diameter of the tire. It means that excellent from each other external diameters of tires, for example, worn-out tires on the back bridge and new tires on the forward bridge can submit incorrect information on instant speed of the car. For elimination of this undesirable phenomenon in the ABS control unit automatic adjustment of tires is carried out. Such selection takes some time. In this period it is impossible to receive the correct coupling of PBS.
Adjustment of tires can be executed in the way described below.
All tires are pumped up on the correct pressure of air – look in the corresponding maintenance instruction or on servicing graphics. about the Car it is dispersed for the speed from 100 to 120 km/h. about Then the car continues movement on a straight line by inertia, without the pressed pedal of gas or a brake while speed will not decrease to 70 km/h.
Such procedure repeats 5 times after that complete adjustment of tires in any case is guaranteed.
The capacity or torque of the engine is automatically regulated in such a manner that within physical borders optimum stability is always provided at movement, force of draft coupling of brakes. Adjustment is carried out by the corresponding electronic controler of the engine by means of contact in a control system of the engine.
Coupling of PBS is shown by means of a blinking of a control lamp 1 on the dashboard. Decrease in engine capacity also is found out to that the engine does not react any more habitually to pressing of a pedal of gas.
After start of the PBS engine it is automatically ready to start. During movement continuous self-checking of system is carried out.
If the control lamp of PBS on the dashboard after inclusion of ignition does not die away in some minutes or constantly lights up during movement, in PBS a malfunction. PBS in this case does not work.