Allroad Quattro V8-4.2L (BAS) (2004)
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Connect test box V.A.G. 1598/31 to wiring harness connectors. Actual engine control module is not to be connected. Connect ground (GND) clip
of test box to ground (GND) (not shown in Fig.).
CAUTION: So as not to destroy electronic components, select required measuring range before connecting test leads and observe test conditions.
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Check for open circuit and short to ground/positive in the following wiring.
Intake camshaft adjustment valve 1 -N205- or 2 -N208-
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Use wiring diagram to eliminate open circuit in wiring/short circuit.
If wiring is OK
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Replace engine control module.
If no fault is found:
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Replace mechanical camshaft adjuster.