RS 4 Quattro Sedan V8-4.2L (BNS) (2007)
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If necessary, repair the faulty wiring connection.
It the specification was obtained.
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J623). Refer to => [ Engine Control Module 1, Removing and Installing ] See: Computers
and Control Systems/Engine Control Module/Service and Repair/Engine Control Module 1, Removing and Installing.
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Using a Multimeter, check the Leak Detection Pump (LDP) (-V144-) electrical harness connector terminals to the Motronic Engine Control
Module (ECM) (J623 ) electrical harness connectors T94 and T60 terminals for an open circuit.
Specified value: 1.5 ohms.
If the specification is not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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If necessary, repair the wiring connection.
If no malfunction is found in wiring:
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Replace the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module 1, Removing and Installing ] See: Computers
and Control Systems/Engine Control Module/Service and Repair/Engine Control Module 1, Removing and Installing.
Assembly is performed in the reverse order of the removal, note the following:
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Install the left rear wheel housing liner.
Final procedures