The reasons for the lack of boost are determined by checking the oil pressure under the following operating conditions:
- no impact on the steering wheel;
- turn the steering wheel all the way.
No impact on the steering wheel
At any engine speed, the pressure in the power steering hydraulic system should not exceed 5-7 bar. If the pressure is too high at idle, the valve is faulty. If the pressure is too low at high engine speeds, the regulator is faulty.
Turn the steering wheel all the way
Note. Check the pressure with the wheels turned all the way as quickly as possible, otherwise the fluid will become very hot.
When turning the steering wheel all the way, the maximum pressure should be:
- engine F - 86-93 bar;
- Z engine - 93-100 bar;
- engine G - 93-103 bar.
When turning the steering wheel from side to side, the pressure deviation should not exceed 5 bar.
If the pressure is too low and the pressure gauge needle trembles, then the regulator is faulty.
If the pressure is too low and the gauge needle does not move, it means the drive belt is loose, the valve is faulty, or there is an internal leak in the power cylinder.
If there is a large deviation in pressure when turning the steering wheel from side to side, the valve is faulty.