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Home >> Volkswagen >> 1994 >> Eurovan L5-2459cc 2.5L SOHC >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Evaporative Emissions System >> Testing and Inspection
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Evaporative Emissions System: Testing and Inspection




Evaporative Emissions (EVAP) System Control, Checking

Test conditions
- Oxygen sensor and Oxygen sensor control OK, checking
- Engine oil temperature 80 °C minimum

Test sequence







- Pull off hose (from EVAP canister) at purge regulator valve -N80- -arrow-
- Start engine and let idle
- Valve must NOT pulse and there must NOT be perceptible vacuum at valve connection
- Increase engine speed
- Valve must pulse periodically and vacuum must be perceptible at connection

Valve does not pulse

- Switch OFF ignition.
- Disconnect solenoid valve and connect VAG 1527 LED tester to connector using jumper wires from VW 1594 adaptor kit
- Start engine and increase speed.
- LED must flicker briefly

If LED does not flicker:
- Locate and eliminate open circuit to ECM using wiring diagram or replace ECM.

If voltage supply OK
- Replace EVAP canister purge regulator valve -N80-
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