S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Leak Detection Pump: Testing and Inspection
Leak Detection Pump, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Fuse (S282) fuse OK.
‹› The ignition switched off.
‹› The voltage for the Leak Detection Pump (LDP) (-V144-) is supplied by the Engine Component Power Supply Relay (J757).
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check.
Start diagnosis
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Remove right rear wheel housing liner.
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Disconnect the Leak Detection Pump (LDP) (V144) electrical harness connector - 3 -.
Checking internal resistance
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Using a Multimeter, check the Leak Detection Pump (LDP) (V144) for resistance as follows:
