Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Perform system test
2004 Audi A8SECTION Perform system test
- 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 :
- In selection - 1 - , press diagnostic function "04- Basic Setting".
Display on VAS 5051 :
1 - Enter display group
- Select function "094" in button field - 2 - for "display group number 094" and press Q to confirm input.
Display on VAS 5051 :
- 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 :
- In selection - 1 - , click on diagnostic function "08 - Read measuring value block".
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.
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).
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.