A8L Quattro Sedan V8-4.2L (AKB) (2002)
Output Diagnostic Test Mode
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EVAP Can. Purge Regulator Valve -N80
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Press button until following display is indicated:
Indicated on display
Output Diagnostic Test Mode
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Leak detection pump tank vent system
The Leak Detection Pump (LDP) -V144 will be activated for approx. 1 minute.
NOTE: Operating noise of Leak Detection Pump (LDP) is audible at left rear wheelhousing.
If Leak Detection Pump (LDP) is not activated (no audible operating sound)
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Switch ignition off.
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Remove Leak Detection Pump (LDP) -V144, and disconnect harness connector.
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Check the internal resistance of the LDP.
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Check the voltage supply for the LDP.
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Check the output wire of the LDP.
Checking internal resistance
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Connect multimeter for resistance measurement as follows.
LDP -V144 terminals
Specified value
1+3
640-720 ohm
2+3
15-17 ohm
If specified values are not obtained:
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Replace Leak Detection Pump (LDP) -V144.
If specified values are obtained:
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Check voltage supply at harness connector of Leak Detection Pump (LDP).
Checking voltage supply
NOTE: Voltage supply for the Leak Detection Pump (LDP) runs via the Fuel Pump (FP) relay.
Test requirement
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Fuse for Leak Detection Pump (LDP) OK
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Disconnect harness connector at LDP.