Power Steering Pump, Checking Delivery Pressure [CAUA, CFSA]: Checking

WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2017 Audi S5, 2017 Audi A5 Quattro, 2016 Audi S5, 2016 Audi A5 Quattro, and 2015 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Suction & Return Hose Clamping Location

Courtesy of AUDI OF AMERICA, LLC

-- Clamp off the suction hose -1- and return hose -2- using the :3094 .

CAUTION:

The :3094 must not be secured on the return hose -2- in the check valve area. Otherwise, check valve will be damaged.
The check valve is located in the return hose -2- between the hose clamps -arrows-.

-- Remove noise insulation. Refer to NOISE INSULATION, REMOVING AND INSTALLING / OVERVIEW - NOISE INSULATION .

-- Position the :VAS 6208 below to collect the hydraulic oil.

-- Remove the pressure line -4- on the crossbrace. Remove bolt -3- to do so.

Fig 2: Identifying Pressure Line -4- On Crossbrace & Bolt -3-

Courtesy of AUDI OF AMERICA, LLC

-- Loosen the union nut -2-. During this, counterhold at hex socket -1-.

-- Engage the tester -3- on the pressure line -1- using a hook -2-.

Fig 3: Engaging Tester -3- On Pressure Line -1- Using A Hook -2-

Courtesy of AUDI OF AMERICA, LLC

-- Install :V.A.G 1402 as shown in illustration.

Fig 4: Installing V.A.G 1402

Courtesy of AUDI OF AMERICA, LLC

Pressure line with separating point
:V.A.G 1402/6
:V.A.G 1402
:V.A.G 1402/6
:V.A.G 1402/3

-- Attach the :V.A.G 1402 hoses to the open connections on the pressure hose as illustrated.

-- Make sure that lever on pressure gauge stands in position -2-.

Fig 5: Ensuring Lever On Pressure Gauge Stands In Open/Closed Position

Courtesy of AUDI OF AMERICA, LLC

-- Lower vehicle.

-- Remove the :3094 .

-- Start engine without giving gas.

-- Turn the steering wheel from lock to lock about 10 times.

-- Switch off engine and, if needed, fill hydraulic fluid in reservoir.

NOTE:

To avoid damage to pump, observe 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.

-- With the engine at idle, close the shut-off valve to position -1- and read the pressure (the lever must face away from the pressure hose). Do not perform measurement longer than 10 seconds.

Fig 6: Ensuring Lever On Pressure Gauge Stands In Open/Closed Position

Courtesy of AUDI OF AMERICA, LLC

Delivery pressure specified value, vehicles without dynamic steering: 113 to 130 bar

Delivery pressure specified value, vehicles with dynamic steering: 117 to 131 bar

If the pressure is not at the specified value, replace the power steering pump. Refer to POWER STEERING PUMP, VEHICLES WITH DYNAMIC STEERING [CAUA, CFSA] or POWER STEERING PUMP, VEHICLES WITHOUT DYNAMIC STEERING [CAUA, CFSA] .

-- Switch off engine.

-- Remove :V.A.G 1402 .

Tightening specifications, refer to POWER STEERING PUMP, HYDRAULIC LINES AND RESERVOIR OVERVIEW, VEHICLES WITHOUT DYNAMIC STEERING [CAUA, CFSA] .

-- Note the line installation location when bolting the line connection. The markings -1- and -2- on the top of the line must align.

Fig 7: Identifying Markings -1- & -2- On Top Of Line Must Align

Courtesy of AUDI OF AMERICA, LLC

-- Secure the pressure line -4- on the crossbrace using the bolt -3-.

-- Check power steering fluid level. Refer to POWER STEERING FLUID LEVEL, CHECKING .

-- Bleed the steering. Refer to STEERING, BLEEDING AFTER REPLACING .

-- Check all open line connections for leaks. Refer to STEERING, CHECKING FOR LEAKS .

-- Install noise insulation. Refer to .