performing self diagnosis

Performing self diagnosis Initiating basic setting Special tools and workshop equipment required

◆ V.A.G 1869 Brake filling and bleeder unit

Warning for vehicles with ABS/EDL! Ensure that a filling pressure of 1 bar is not exceeded, when filling brake fluid using brake filling and bleeder unit V.A.G 1869.

Function 04 "Initiate basic settings" performs three functions with the ESP:

◆ -1- Display group number 001 is required to bleed the hydraulic unit.

◆ -2- In display group number 031 a functional check of the brake pressure solenoids and the brake recognition switch is performed.

◆ -3- Display group numbers 060, 063 and 066 are required to perform a zero compensation of the steering angle sender, the lateral acceleration sender and the brake pressure senders.

-1- Hydraulic unit is bled using display group 001 on vehicles with an ESP system =>Page 01-215.

Basic settings 04, display group number 001 is only required when at least one of

of 23Running Gear Self-Diagnosis for ABS

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the brake fluid reservoir chambers is completely empty.

Basic settings must also be carried out after a leaking brake system has been serviced.

Function 11 "Login procedure" is not required in this case.

-2- Using display group number 031 a functional check of the brake pressure solenoid valve and the brake recognition switch is performed =>Page 01-225.

This is required when:

◆ Brake servo is replaced. ◆ When a fault memory requires it to

be carried out.

Function 11 "Login procedure" is not required in this case.

-3- Using display group numbers 060, 063 and 066 a zero compensation is performed.

Zero compensation of steering angle sender is performed with display group number 060 =>Page 01-228.

Zero compensation of lateral acceleration sender is performed with display group number 063 =>Page 01-231.

Zero compensation of brake pressure sender is performed with display group number 066 =>Page 01-233.

Performing zero compensation using



display group numbers 060, 063 and 066 requires that function 11 "Login procedure" is performed successfully with fault reader V.A.G 1551/5252 => Page 01-235.

This is required if:

◆ Control unit -J104, steering angle sender -G85- or steering column are replaced.

◆ Adjustments to running gear are made within the framework of vehicle alignment.

◆ If steering wheel has been removed, perform a zero compensation in display group number 060.

◆ Lateral acceleration sender -G200- has been replaced.

◆ Brake pressure sender -G201- and/or -G214- have been replaced.

◆ When there is a fault entry in control unit -J104- fault memory and the fault table requires zeroing to be performed.

Display group 001: Bleeding hydraulic unit

‒ Connect brake filling and bleeder unit V.A.G 1869.

‒ Connect fault reader V.A.G 1551 and select address word 03 for brake electronics with ignition switched on => Page 01-22.

→ Indicated on display:

Rapid data transfer HELPSelect function XX

‒ Press keys 0 and



4. (The function "Initiating basic setting" is selected with 04).


Rapid data transfer Q04 - Basic setting

‒ Confirm entry with key Q.

Warning lamps for ABS -K47- and brake system -K118- flash during the next work sequence. → Indicated on display:

Basic settingInput display group number XXX

‒ Press keys 0, 0 and 1



System in basic settings 1Depress pedal and hold...

Operate pedal with substantial foot pressure and hold.

◆ Pedal moves down

◆ Hydraulic pump runs

◆ Pedal comes back → Indicated on display:

System in basic settings 1Rel. pedal; FR+FL bleed screw OPEN



‒ Press key 3 → Indicated on display:

System in basic settings 2Please wait...(10 sec.)

Hydraulic pump runs → Indicated on display:

System in basic settings 2Depr. pedal 10X; bleed screw CLOSED
































‒ Press key 3




















Operate pedal with



substantial foot pressure and hold.
















‒ Press key 3 → Indicated on



display: System in basic settings 14Please wait...(10 sec.)















System in basic settings 17Partial bleeding complete...

‒ Press ⇒ key.





‒ Press keys -0- and -6-, this ends the output.


Rapid data transfer Q06 - End output

‒ Confirm entry with Q key


Rapid data transfer HELPEnter address word XX

‒ Switch off ignition.

‒ Disconnect fault reader V.A.G 1551

Then the brake system must be bled.

=> Brake system; Repair group 47; Bleeding brake system

Display group number 031: Checking brake pressure solenoid valve and brake recognition switch

‒ Connect fault reader V.A.G 1551 and select address word 03 for brake electronics with



ignition switched on => Page 01-22.



‒ Start engine. ‒ Press keys 0 and

4. (The function "Initiating basic setting" is selected with 04).








ABS warning lamp -K47- flashes. → Indicated on display:

System in basic settings 31 Magnetic coil activated


System in basic settings 32 -0.85bar -2.12bar not oper.

Do depress brake pedal




System in basic settings 33 Depress pedal and hold...


Brake lights light up

If the brake lights do not light up:

◆ Brake light switch -F- defective or incorrectly set => Electrical checks, page 01-286, Adjusting brake light switch.

◆ Brake recognition switch -F83- defective => Electrical checks, page 01-236, test step No. 23.

◆ Brake light suppression relay -J508- defective.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

‒ Press key 3




System in basic settings 34 27.41bar 25.50bar operated


System in basic settings 35 release pedal

‒ Remove foot from brake pedal.


System in basic settings 36 -0.85bar -2.12bar not oper.


System in basic settings 37 Magnetic coil test finished

‒ Press ⇒ key. → Indicated on display:


‒ Press keys 0 and 6, this ends the output.



Display group number 060: Zero compensation of steering angle sender -G85

‒ Start engine. ‒ Carry out a short

test drive over a flat and level



surface. Drive straight-ahead and not faster then 20 km/h (12.5 mph) and observe the two following points:

‒ If the steering wheel is not in the straight-ahead position when driving straight-ahead during a test drive, then correct the steering wheel position within the frame work of an alignment test and ensure the steering wheel is in the straight-ahead position.

=> Running gear, Axles, Steering; Repair



group 44; Vehicle alignment

‒ Perform a zero compensation.

Steering wheel straight during test drive, but vehicle moves off-line when moving straight-ahead.

Ensure steering wheel is not moved. Do not switch off ignition!

‒ Check zero compensation with the aid of function 08 "Read measured value block" =>Page 01-195, Display group number 004.

● Perform function 11 "Login procedure" successfully first using Fault reader V.A.G 1551/52 => Page 01-235.





‒ Press keys 0 and 4. (The function "Initiating basic setting" is selected with 04).








ABS warning lamp -K47- flashes. → If this display appears the login procedure has not been performed successfully.

Function is unknown or cannot be - ⇒performed at moment


System in basic settings 60compens. OK. 0.05

‒ or: → If this display appears, the values measured are not within the tolerance range permitted ( ±10°) for a zero

System in basic settings 60compens. not poss. -36.05



compensation.1. Interrogate fault memory (Function 02)

2. Erase fault memory (Function 05)

3. End output (Function 06)

4. Switch off ignition.

5. Switch on ignition.

6. Perform zero compensation again.






‒ Warning lamps for ABS -K47- and stability program -K155- light up for approx. 2 seconds.

Display group number 063: Zero compensation of lateral acceleration



sender

‒ Position the vehicle on a flat level surface.

‒ Check measured values with the aid of function 08 "Read measured value block" =>Page 01-195, Display group number 004.

‒ Perform function 11 "Login procedure" successfully first using Fault reader V.A.G 1551/52 => Page 01-235
















System in basic settings 63compens OK. 0.0m/s2

‒ or: → If this display appears, the values measured are not within the tolerance range permitted (±2.5 m/s2).

System in basic settings 63compens. not poss. 5.0m/s2

1. Interrogate fault memory (Function 02)








‒ Press ⇒ key.







Display group number 066: Zero compensation of brake pressure sender

Do not depress brake pedal.

‒ Check measured values with the aid of function 08 "Read measured value block" =>Page 01-195, Display group number 005.

‒ Perform function 11 "Login procedure" successfully first



using Fault reader V.A.G 1551/52 => Page 01-235














System in basic settings 66compens. OK. - 0.85bar - 1.91bar

After a successful zero



compensation the value in the display does not return to 0.00 bar

‒ or: → If this display appears, the values measured are not within the tolerance range permitted ± 7 bar.

System in basic settings 66compens. not poss. - 10.85bar - 12.12bar

1. Interrogate fault memory (Function 02)













performing self diagnosis

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