A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Connect test box (V.A.G 1598/31) at wiring harness to Engine Control Module (ECM) (-J623-). Do not connect ECM => [ Wiring and
Components, Checking with Test Box VAG 1598/31 ] See: Testing and Inspection/Component Tests and General Diagnostics/Wiring and
Components, Checking With Test Box VAG 1598/31.
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Bridge terminals 1 and 65 at test box using adapter cables from connector test kit (V.A.G 1594 A) (this step supplies Ground to one side of relay
coil of Fuel Pump relay).
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Switch ignition on.
‹› After switching the ignition on, the Fuel Pump (FP) will run continuously, even with the engine not running, for the following reason: After
switching the ignition on, the Fuel Pump (FP) relay supplies continuous B+ via central electronics. Ground is supplied to the FP relay via the
bridge in the test box.
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Check injectors for leaks (visual inspection). Only 1 to 2 drops per minute may emit from each valve when Fuel Pump (FP) is running.
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If fuel loss is greater, stop Fuel Pump (FP) from running (switch off ignition) and replace faulty fuel injector.
Injection quantity, checking
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Insert fuel injector to be tested into measuring container of fuel injection quantity tester (V.A.G 1602).
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Connect one terminal of fuel injector to engine Ground (GND) using an adapter cable and an alligator clip from connector test kit (V.A.G 1594
A).
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Connect second contact of fuel injector with remote control (V.A.G 1348/3A), adapter cable (V.A.G 1348/3-2) and assisting cable to Positive
(B+).
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Switch ignition on.
‹› Fuel Pump (FP) must run.