S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
Canister Purge Regulator Valve: Testing and Inspection
Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80, Checking
Checking for leaks
If there is no electrical signal (not activated) the solenoid valve remains closed.
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Disconnect hoses from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.
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Start output Diagnostic Test Mode and select Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80. Refer to "Scan Tool
Testing/Output Diagnostic Test Mode (DTM)" See: Computers and Control Systems/Testing and Inspection
Indicated on display
Output Diagnostic Test Mode
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EVAP canister purge regulator valve -N80
The valve should click and should open and close (test by blowing into auxiliary hose).
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If valve does not click, carry out electrical test of Evaporative Emission (EVAP) Canister Purge Regulator Valve.
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If valve does not open and close properly, replace Evaporative Emission (EVAP) Canister Purge Regulator Valve.
Electrical testing of Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80
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Disconnect connector from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.
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Measure resistance between contacts on valve using hand-held multimeter Fluke 83 (or equivalent).
Specified value: 22 - 30 Ohms
If the specification is not obtained:
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Replace Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.
If the specification is obtained:
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Check voltage supply.
Checking voltage supply to Evaporative Emission (EVAP) Canister Purge Regulator Valve (solenoid valve)
NOTE: The Evaporative Emission (EVAP) Canister Purge Regulator Valve receives its power supply via the fuel pump relay.
Test requirements
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Fuse for EVAP valve OK
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Disconnect harness connector on Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80.