A6 Sedan V6-2.8L (ATQ) (2000)
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Disconnect hoses from EVAP valve; harness connector remains connected.
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Attach assisting hose to one connection of EVAP valve.
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Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. Refer to "Scan
Tool Testing/Scan Tool Connecting And Initial Checks", See: Computers and Control Systems/Testing and Inspection
Ignition must remain switched on for this.
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Initiate output DTM and activate Evaporative Emission (EVAP) canister purge regulator valve -N80-. Refer to "Scan Tool Testing/Output
Diagnostic Test Mode (DTM) (Function 03)", 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
Valve must click and must open and close (can be tested by blowing into assisting hose).
If valve does not click:
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Check internal resistance of EVAP valve.
If valve does not open and close properly:
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Replace Evaporative Emission (EVAP) canister purge regulator valve -N80-.
Checking Internal Resistance
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Disconnect connector at EVAP valve.
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Connect multimeter at valve for resistance measurement.
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Specification: 22 to 30 Ohms
If specified value is not obtained:
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Replace Evaporative Emission (EVAP) canister purge regulator valve -N80-.
If specified value is obtained:
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Check voltage supply.
Checking Voltage Supply
Test Requirements:
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Fuse for the EVAP valve OK.
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Fuel Pump (FP) OK, checking. See: Fuel Delivery and Air Induction/Fuel Pump/Fuel Pump Relay/Testing and Inspection
NOTE: Voltage is supplied to the EVAP valve via the Fuel Pump (FP) relay.
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Disconnect connector at EVAP valve.