Testing solenoid valves for camshaft adjustment (-N205 and -N208) — AUDI

AJG ALF
Switch ignition on.
Start final control diagnosis and select camshaft timing control
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Final control diagnosis
⇒
Camshaft timing control 1
Indicated on display:

When the camshaft timing control is activated, both solenoid valves should click audibly.

If this result is not obtained, carry out the following tests:

Electrical test of solenoid valves for camshaft adjustment

Unplug connector from the camshaft adjustment solenoid valve which is to be tested.
Measure resistance between the valve contacts using hand-held multimeter V.A.G 1526.

Specification: 10 ... 18ω

If the reading does not match the specification:

Renew the relevant camshaft adjustment valve.

Testing voltage supply to camshaft adjustment valves

Unplug connector from the valve which is to be tested.
Connect diode test lamp V.A.G 1527 between engine earth and contact 1 (positive) of the connector using test leads from auxiliary cable set V.A.G 1594.
Operate the starter for a few seconds. The engine can be allowed to start.

The diode test lamp should light up.

If the diode test lamp does not light up, carry out the following tests:

Test fuse for camshaft adjustment valves.
Test for open circuit in wiring between fuse and contact 1 on connectors for camshaft adjustment valves using current flow diagram.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Test fuel pump relay and activation
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Testing activation of camshaft adjustment valves

Unplug connector from the valve which is to be tested.
Connect diode test lamp V.A.G 1527 between contacts 1 (positive) and 2 of the valve connector using test leads from auxiliary cable set V.A.G 1594.
Start final control diagnosis and select camshaft timing control
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Final control diagnosis
⇒
Camshaft timing control 1
Indicated on display:

When the camshaft timing control is activated the diode test lamp should start flashing.

If the diode test lamp does not flash or lights up continuously:

Connect test box V.A.G 1598/22 to wiring harness for engine control unit =>Page
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If the diode test lamp lights up continuously:

Test for short to earth in wiring from contact 2 on connector for camshaft adjustment valve.

If the diode test lamp does not flash:

Test for open circuit or short to positive in wiring between contact 2 on connector for camshaft adjustment valve and socket 55 on test box.

Resistance in wiring: max. 1.5ω

Rectify any open circuits or short circuits.

If no open circuits or short circuits are found, fit a new engine control unit => Page
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If no faults have been found in any of the tests so far, renew the relevant mechanical camshaft adjuster.

=> 6-cylinder Engine, Mechanics; Repair group 15; Cylinder head, valve gear; Removing and installing camshafts and camshaft adjusters
6-cylinder Engine, Mechanics
Cylinder head, valve gear
Removing and installing camshafts and camshaft adjusters