A6 Quattro Sedan V6-3.0L (AVK) (2002)
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Disconnect connector to intake manifold change-over valve -N156- -1-.
NOTE: Ignore item -2-.
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Connect one terminal on solenoid valve to engine Ground using test leads and alligator clamp from VAG 1594 A.
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Connect second terminal on intake manifold change-over valve -N156- to positive using remote control VAG1348/3A, adapter lead VAG1348/3-2
and auxiliary cable.
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Operate remote control VAG1348/3A approx. 2 to 3 minutes; throughout this period, vacuum module should remain energized.
If the vacuum module retardations to its original "rest" position, carry out the following test:
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Disconnect vacuum hoses from vacuum module for intake manifold change-over system.
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Connect hand vacuum pump VAG1390 to vacuum module.
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Operate hand pump and check whether change-over function is working.
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Check vacuum module for leaks. (Vacuum module should not return to rest position until hand pump is vented to atmosphere.)
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Replace vacuum module, if necessary.
If vacuum module is not energized, check intake manifold change-over valve -N156- as follows for blockage:
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Connect one terminal of intake manifold change-over valve -N156- to engine Ground using test leads and alligator clamp from VAG 1594 A.
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Connect second terminal on intake manifold change-over valve -N156- to positive using remote control VAG1348/3A, adapter lead VAG1348/3-2
and auxiliary cable.
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Operate remote control VAG1348/3A.
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Check valve for obstructions (disconnect vacuum hoses and blow through).
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Replace intake manifold change-over valve, if necessary.
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If no DTCs have been found in any test, check vacuum system for leaks.