Connect one pressure gauge to the outlet of the working hydraulic system and the other to the outlet of the oil pressure regulator.
Disconnect the vacuum hose from the vacuum modulator and plug the hose opening.
Connect the vacuum pump to the vacuum modulator.
Brake the vehicle with the parking brake.
Start the engine and move the selector lever to the position «D».
Gently depress the accelerator pedal and at the moment of a sharp drop in the operating oil pressure, measure and record the value of the control pressure.
Measure the control pressure again, having previously created a vacuum of 200 mmHg with a vacuum pump. Art.
If the values obtained do not correspond to the nominal (see subsection «Detailed Specifications»), check that the vacuum modulator rod is installed correctly and that it moves freely.