Perform system test

WARNING: This page is about a different car, the 2006 Audi A8, 2005 Audi A8, and 2004 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Vehicle Diagnosis, Testing And Information System VAS 5051B

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Vehicle Diagnosis, Testing and Information System VAS 5051 with VAS 5051/1 (VAS 5051 B version shown as example only)

Test conditions

Coolant temperature at least 80°C.
Vehicles with automatic transmission: Selector lever in position P or N.

Test sequence

Connect Vehicle Diagnostic, Testing and Information System VAS 5051 and select vehicle system "01 - engine electronics". Engine must run at idle for this.

CAUTION:

Test and measuring equipment must always be secured to the rear seat and be operated from there by a second person.
If test and measuring instruments are operated from the front passengers seat and the vehicle is involved in an accident, there is a possibility that the person sitting in this seat may receive serious injuries when the airbag is triggered.

Display on VAS 5051 :

Fig 2: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

In selection - 1 - , press diagnostic function "04- Basic Setting".

Display on VAS 5051 :

1 - Enter display group

Fig 3: Diagnostic System VAS 5051: Display - Display Group And Key Pad

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Select function "094" in button field - 2 - for "display group number 094" and press Q to confirm input.

Display on VAS 5051 :

Fig 4: Diagnostic System VAS 5051: Display - Display Fields

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Activate basic setting by pressing button A.
Increase engine speed to approx. 2000 RPM for about 10 seconds.
Check specified values in display fields - 3 - and - 4 -.

	Display field
	1	2	3	4
Display group 94: Camshaft adjustment bank 1 (right cyl. bank) and bank 2 (left cyl. bank)
Display	xxxx/min	---	---	---
Indicated	Engine RPM	Variable valve timing	Camshaft adjustment, Bank 1	Camshaft adjustment, Bank 2
Operating range		Cs-CM ON Cs-CM OFF	Test OFF Test ON Syst. OK Syst. nOK	Test OFF Test ON Syst. OK Syst. nOK
Specified value	Greater than 2000/min		System OK	System OK

If specified value "Syst. OK" is not obtained:

Click on button twice.

Display on VAS 5051 :

Fig 5: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

In selection - 1 - , click on diagnostic function "08 - Read measuring value block".

Fig 6: Diagnostic System VAS 5051: Display - Display Group And Key Pad

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051 :

1 - Enter display group

Select function "090" in button field - 2 - for "display group number 090" and press Q to confirm input.

Fig 7: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051 :

Test conditions

Engine running at idle.

Check specified values in display fields - 3 - and - 4 -.

	Display field
	1	2	3	4
Display group 090: Camshaft adjustment in idle position
Display	xxx/min	---	° KW	° KW
Indicated	Engine RPM	Adjustment	Adjustment bank 1 (right cylinder bank)	Adjustment bank 2 (left cylinder bank)
Specified value	xxxx/min	Cs-CM. OFF	-3 to 6° KW	-3 to 6° KW

Perform test drive.
Check specified values in display fields - 3 - and - 4 -.

	Display field
	1	2	3	4
Display group 090: Camshaft adjustment while driving
Display	xxxx/min	---	° KW	° KW
Indicated	Engine RPM	Adjustment	Adjustment bank 1 (right cylinder bank)	Adjustment bank 2 (left cylinder bank)
Specified value	xxxx/min	Cs-CM. ON	16 to 25° KW	16 to 25° KW

Press button to end function "08 - Read measuring value block".

If specifications are not obtained:

Check solenoid valves for camshaft adjustment Guided Fault Finding.

NOTE:

If display field indicates a value between 6.0° Crankshaft and 16.0° Crankshaft during a road test, the electrical valve for camshaft adjustment is correctly switching the oil pressure to mechanical camshaft adjuster but the mechanical camshaft adjuster cannot reach its end position (e.g. due to difficulty of movement).