A4 Sedan L4-2.0L Turbo (BPG) (2005)
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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 (LDP) Terminal
Specified value
- 1 - + -3-
640 to 720 Ohms
- 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 for leak detection pump is supplied via Motronic Engine Control Module (ECM) Power Supply Relay J271.
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 connector
Measure to
Terminal
- 3 -
Engine Ground (GND)
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Briefly operate starter.
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LED must light up.