Power Steering Pump Delivery Pressure, Generation I With SCR And Generation II, Checking
Special tools and workshop equipment required
- Hose Clamps - Up To 25mm 3094
- Torque Wrench 1331 5-50Nm VAG1331
- Power Steering Test Unit VAG1402
- Power Steering Test Unit - Adapter Hose VAG1402/6
- Power Steering Test Unit - Adapter Set VAG1402/17
Test Prerequisites
- Ribbed belt/ribbed belt tension OK
- Sealing of system
- Hoses/lines are not kinked or constricted
Checking
-- Carefully pull off engine cover from 4 retainers -arrows-.
-- Remove the air guide hose -arrows-.
-- Clamp the intake hose and the return line on the reservoir using Hose Clamps - Up To 25mm 3094.
- The Hose Clamps - Up To 25mm 3094 must not be secured on return hose in check valve area. Otherwise, check valve will be damaged.
- The check valve is in the return hose between the cambers -A arrows- or between hose clamps -B arrows-.
-- Remove the screws -1- and remove the pressure line from the power steering pump.
-- Mount the Power Steering Test Unit VAG1402 as illustrated.
- Power Steering Pump
- Power Steering Test Unit - Adapter Set -Adapter 1 VAG1402/17-1, refer to 1 with Power Steering Test Unit - Adapter Set - Adapter 3 VAG1402/17-3
- Screw for mounting the pressure line, refer to -item 8- Bolts
- Hose from Power Steering Test Unit - Adapter Hose VAG1402/6
- Power Steering Test Unit VAG1402
- Pressure Line
- Power Steering Test Unit - Adapter Set - Adapter 2 VAG1402/17-2 with Power Steering Test Unit - Adapter Set - Adapter 3 VAG1402/17-3
- Replace the Power Steering Test Unit - Adapter Set -Adapter 1 VAG1402/17-1 seal if it is damaged or leaking, refer to -item 10- Seal.
Position the Power Steering Test Unit - Adapter Set - Adapter 3 VAG1402/17-3 on the Power Steering Test Unit - Adapter Set -Adapter 1 VAG1402/17-1 so that the hose from the Power Steering Test Unit - Adapter Hose VAG1402/6 does not touch the pulley and/or ribbed belt.
Tighten the union nuts on the Power Steering Test Unit - Adapter Set - Adapter 3 VAG1402/17-3 and the Power Steering Test Unit - Adapter Hose VAG1402/6 hoses hand-tight with an open-end wrench.
-- Remove the Hose Clamps - Up To 25mm 3094.
Make sure the lever on the pressure gauge is in position -2-.
-- Install the air guide hose -arrows-.
-- Start engine and fill hydraulic fluid in reservoir if necessary.
-- Turn steering wheel from stop to stop approximately 10 times.
To avoid damage to pump, note the following:
Pressure gauge shut-off valve must not remained closed longer than 10 seconds during this test.
Start engine without giving gas and run at idle.
Read the pump pressure immediately after starting at idle speed (have it read by second technician, if necessary).
Because pressure falls over the course of the test, the highest pressure shown is the decisive measurement.
-- Now check delivery pressure.
-- Start engine and when at idle speed, close shut-off valve -item 1- and read pressure (do not measure longer than 10 seconds).
Delivery pressure specified value: 110 to 128 bar
If specified value is not obtained, replace power steering pump, refer to Assembly Overview II - Power Steering Pump for Engine Generation I with SCR and generation II .
-- Switch off engine.
-- Remove Power Steering Test Unit VAG1402.
-- Insert the pressure line with a new o-ring into the power steering pump and tighten the screws, refer to -item 8- Bolts.
-- Bleed steering system, refer to STEERING SYSTEM, BLEEDING AFTER REPLACING .
-- Check power steering fluid level, refer to POWER STEERING, CHECKING HYDRAULIC OIL LEVEL .
-- Check the steering system for leaks, refer to STEERING SYSTEM, CHECKING FOR LEAKS .
-- Clean engine, engine compartment and subframe in power steering pump area.