S4 V8-4.2L (BHF) (2004)
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From selection, click on diagnostic function "06. End output".
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Switch off ignition.
If Leak Detection Pump (LDP) for fuel system is not activated (no operating noise audible):
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Remove leak detection pump (LDP) V144 and disconnect the electrical connection.
Checking internal resistance
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Connect hand multimeter V.A.G 1526 A or V.A.G 1526 B for resistance measurement as follows.
Leak detection pump
Specified value
(LDP) Terminal
- 1 + - 3 -
640 to 720 ohm
- 2 + - 3 -
15 to 17 Ohms
If specifications are not obtained:
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Replace Leak Detection Pump (LDP) V144
If specified values are achieved:
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Check voltage supply of leak detection pump.
Checking voltage supply
NOTE: Voltage is supplied to the leak detection pump via the Fuel Pump (FP) relay J17.
Test conditions
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Fuse for leak detection pump OK
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Connect voltage tester V.A.G 1527 B as follows:
Harness connectorTerminal
Measure to
- 3 -
Engine Ground (GND)
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Briefly operate starter.
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LED must light up.