S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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If specifications are not obtained:
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Replace the Leak Detection Pump (LDP) (V144). Refer to => [ Leak Detection Pump ] See: Service and Repair.
If specified values are achieved:
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Check voltage supply of leak detection pump.
Checking voltage supply
‹› Voltage for leak detection pump is supplied via Motronic Engine Control Module (ECM) Power Supply Relay (J271).
Test Conditions
‹› Fuse for leak detection pump OK
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Connect Voltage Tester (V.A.G 1527B) as follows:
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Briefly operate starter.
‹› LED must light up.
If LED does not light up:
