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HOMESERVICE MANUALSAUDI2007S8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISFUEL SUPPLY SYSTEM20 - FUEL SUPPLYEVAP CANISTER SYSTEMDIAGNOSTIC LEAK TEST, PERFORMINGNOTES
2007 Audi S8

Diagnostic leak test, performing: Notes

2007 Audi S8SECTION Notes

Special tools, testers and auxiliary items required 

Fig 1: Identifying Vehicle Diagnosis, Testing And Information System VAS 5051B
GW00002349Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Vehicle diagnostic, testing, and information system VAS 5051 (VAS 5051 B version shown as example only)

Work procedure 

  • Electrical parking brake activated.
  • Vehicles with manual transmission: Shift lever in neutral.
  • Vehicles with automatic transmission: Selector lever in "P" or "N".
  • Engine running at idle.
  • Electrical consumers switched off (Radiator fan must not run during test).
  • Air conditioning system switched off.
Fig 2: Connecting Data Link Connector (DLC)
GW00016002Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Vehicle Diagnosis, Testing and Information System VAS 5051 connected, On-board diagnostics and vehicle system "01 Engine electronics" selected.
  • No faults in DTC memory.
  • Intake air temperature less than 90° C → Measuring value block 004, display field 4.
  • Coolant temperature less than 95° C → Measuring value block 004, display field 3.
  • Throttle valve angle less than 10° → Measuring value block 003, display field 3.

Observe safety precautions → Safety precautions .

Observe rules for cleanliness → Rules for cleanliness .

NOTE:
  • Secure all hose connections using hose clamps appropriate for the model type .
  • Replace seals and gaskets when performing repair work.
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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.