Skoda Workshop Service and Repair Manuals

Check the feed pressure of the engine pump aggregate TRW Special tools and workshop equipment required t  Vehicle diagnosis, measurement and information system -VAS- t  Power-assisted steering testing device, e. g. -V.A.G 1402- t  Adapter, e.g. -V.A.G 1402/1A- t  Adapter, e.g. -V.A.G 1402/2- t  Hose from adapter set, e. g. -V.A.G 1402/6- t  Extraction bottle (commercially available) t  Jumper cable (commercially available) t  Catch pan (commercially available) t  Hydraulic oil → Chapter   Note t  If there is insufficient hydraulic oil in the reservoir of the engine pump aggregate always check the power-steering system for tightness → Chapter. t  If there is a leak on the power-steering gear first check the lines/line connections for tightness, if necessary retighten and wipe dry. t  Inspecting the gasket ring on the input shaft of the power-steering gear and on the gear rack seal → Chapter. If there are leaks on the gasket ring or on the gear rack seal replace the power-steering gear. t  Disposing of the power-steering gear → Chapter. t  After extraction there will be residual hydraulic oil in the engine pump aggregate as well as in the pressure line (expansion hose). t  Do not use drained hydraulic oil again. t  After the feed pressure test replace the O-ring on the pipe screw of the pressure line. t  Do not pinch off the pressure hose and the return hose with hose clamps -MP7-602 (3094)- or any other tools! Pinching off may result in damage to the pressure and return line. t  To avoid damage make sure the bending radius of at least 100 mm is respected when bending or tying up the pressure line. Test conditions l  Tightness of the system l  Pressure and return line not buckled or tied up.   Note t  Because of the different dimensions of the battery the screw cap of the hydraulic oil reservoir on certain vehicle versions is concealed by the battery tray and battery. If this is the case remove the air filter, the battery and the battery tray. t  If necessary remove air filter → Engine; Rep. gr.24 (petrol engines) or → Engine; Rep. gr.23 (diesel engines). t  Then if necessary, remove battery and battery tray → Electrical System; Rep. gr.27.

–  Unscrew the screwed lid -1- for the hydraulic oil reservoir -2- of the engine pump aggregate. –  Extract the hydraulic oil with an extraction bottle via the filler neck. –  Remove front left wheel. –  Remove the sound dampening system → Body Work; Rep. gr.50. –  Remove the left wheelhouse liner → Body Work; Rep. gr.66.

–  Open spacer holder -1- and remove pressure line (expansion hose) -2-.   Note After removing the pressure line from the engine pump aggregate hydraulic oil will escape from the connection opening. –  Place the catch pan under the engine pump aggregate to collect escaping hydraulic oil.

–  Unscrew pipe screw for pressure line -2- and pull pressure line (expansion hose) out of the engine pump aggregate -3-.   Note t  The pressure line must not be exposed to traction. t  Make sure the bending radius of the pressure line is no less than 100 mm. –  Tie up the pressure line on the stabilizer.

Connect tester –  Connect Power-steering tester-1-, e. g. -V.A.G 1402-. –  Suspend the power-steering tester on front axle. Hoses must not be exposed to tension. 2 -  Hose from adapter set, e. g. -V.A.G 1402/6- 3 -  Adapter, e.g. - V.A.G 1402/2- 4 -  Adapter, e.g. - V.A.G 1402/1A- A -  Pressure line B -  Engine pump aggregate with encapsulation C -  Return-flow line

Test preparations –  Open the shut-off valve on the power-steering tester pressure gauge -1-. Lever -2- points perpendicularly down. –  Lower the vehicle.   Caution Observe the applicable safety instructions for disconnecting the battery with jumper cables! –  If necessary connect battery to jumper cables. –  Filling with hydraulic oil and bleeding the steering system → Chapter. Inspection   Note t  A 2nd mechanic is required to check the feed pressure of the engine pump aggregate or the system pressure. t  To avoid damaging the engine pump aggregate or the power-steering system, the test of the feed or system pressure must not last longer than 5 to 10 seconds. –  Start engine.

–  Close the shut-off valve on the power-steering tester pressure gauge -1- with the engine running at idling speed. Lever -2- points to the left. –  Read pressure. –  Compare the measured value to the nominal value according to the following table.

Engine	Nominal value overpressure 1)
	MPa	bar
Fuel engines	9,0…10,5	90…105
Diesel engines	9,0…10,5	90…105

1) maximum system pressure or feed pressure of the engine pump aggregate   Note If the nominal value is exceeded or if it is not reached replace the engine pump aggregate.

–  Open the shut-off valve on the power-steering tester pressure gauge -1-. Lever -2- points perpendicularly down. –  Given a maximum left and right steering angle hold the steering wheel in position with a force of approx. 10...20 Nm during approx. 5 seconds. –  Read off pressure at maximum steering angle (left/right). If the read off pressure is significantly lower than in the previous measurement, then the steering gear is leaking. –  Switch off engine.

–  Unscrew the screwed lid -1- for the hydraulic oil reservoir -2- of the engine pump aggregate. –  Extract the hydraulic oil with an extraction bottle via the filler neck. –  Removing Power-steering tester, e. g. -V.A.G 1402-. –  If necessary replace defective engine pump aggregate → Chapter.    Disposing of the engine pump aggregate → Chapter.

–  Position pressure line (expansion hose) -2- in spacer holder -1- and close spacer holder. –  Mount pressure line on the engine pump aggregate. –  Filling with hydraulic oil and bleeding the steering system → Chapter. –  Disconnect the jumper cable. –  Install the front left wheelhouse liner → Body Work; Rep. gr.66. –  Install the noise insulation → Body Work; Rep. gr.50. –  Install front wheel.   Note t  If necessary install battery tray and battery → Electrical System; Rep. gr.27. t  Then if necessary install air filter → Engine; Rep. gr.24 (petrol engines) or → Engine; Rep. gr.23 (diesel engines). t  Pay attention to the measures after re-connecting the battery → Electrical System; Rep. gr.27. –  Connect battery → Electrical System; Rep. gr.27. –  Perform self-diagnosis of the power-steering → Chapter. If faults are stored in the fault memory: –  Remove fault. –  Erase fault memory.

Tightening torques:

Pressure line to engine pump aggregate TRW	30 Nm
Wheel bolts	→ Chapter