S6 V8-4.2L (BBD) (2004)
Variable Valve Timing Actuator: Testing and Inspection
With Manufacturer's Scan Tool
Valve 1 for camshaft adjustment -N205- and Valve 2 for camshaft adjustment - N208-, checking
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Switch ignition on.
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Perform Output Diagnostic Test Mode (DTM) and actuate valves for camshaft adjustment. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Output Diagnostic Test
Mode (DTM) (Function 03)
Indicated on display
Output Diagnostic Test Mode ->
Valve 1 for camshaft adjustment
Upon actuation of camshaft timing control, both valves should give a clearly audible click.
If specified value is not attained, perform the following tests:
Checking valves for camshaft adjustment electrically
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Disconnect connector from relevant valve for camshaft adjustment.
Measure resistance between contacts on valve using hand-held multimeter VAG 1526.
Specified value: 10 ... 18 ohm.
If specification is not attained:
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Replace relevant valve for camshaft adjustment.
Testing voltage supply valves for camshaft adjustment
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Disconnect connector from relevant valve.
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Connect diode test lamp VAG 1527 between engine Ground and socket 1 (positive) on connector using cables from adapter set VAG 1594.
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Operate starter for a few seconds. Engine may start.
Diode test lamp should illuminate.
If the diode test lamp does not illuminate, perform the following tests:
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Check fuse for valves for camshaft adjustment.