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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEVAPORATIVE EMISSIONS SYSTEMLOCATIONSEVAP SYSTEM LEAK DETECTION CIRCUIT DIAGRAM
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)

EVAP System Leak Detection Circuit Diagram

1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION EVAP System Leak Detection Circuit Diagram








1 - Throttle valve control module - J338
2 - Evaporative Emission (EVAP) canister purge regulator valve -N80
- Location: In engine compartment
- Checking:
3 - Vent line
- From EVAP canister to EVAP canister purge regulator valve -N80
- Installation position: right side under floor pan
4 - Vent line
- To gravity valve on expansion tank
5 - EVAP canister
- Location: Inside bottom of spare wheel well
6 - Connection hose
- LDP/EVAP canister
- Pressure side
7 - Leak Detection Pump (LDP) V144
- Vacuum operated
- Location: In wheel housing left rear, beneath wheel housing liner
8 - Air filter
- For LDP pump
- Location: Arrow on filter housing points to LDP 7
9 - Vacuum line/hose
- LDP/intake manifold, front
RENDER: 1.0x

NO RELATED

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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.