Audi Workshop Service and Repair Manuals

Note:

Fitting locations of solenoid valves=>Pages 24-8.

Special tools, testers and auxiliary items

• ◆ Hand multimeter V.A.G 1526 or V.A.G 1526 A
• ◆ Diode test lamp V.A.G 1527
• ◆ Adapter set V.A.G 1594
• ◆ Test box V.A.G 1598/22

• ‒ Connect fault reader V.A.G 1551
  .
• ‒ Switch ignition on.
• ‒ Start final control diagnosis and select camshaft timing control => Page 01-79.

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

If the valve does not click, switch off the ignition.

• ‒ Unplug connector from the solenoid valve which is being tested.

• ‒ → Measure the resistance between the solenoid valve contacts using V.A.G 1526.
• ‒ Specification: 10 ... 18ω
• ‒ If the value does not match the specification, fit a new solenoid valve.

Testing voltage supply to camshaft adjustment valves

(-N205 and -N208)

• ‒ Unplug connector on the solenoid valve which is being tested.

• ‒ → Connect diode test lamp V.A.G 1527 to contact 1 on connector and to engine earth using auxiliary leads from V.A.G 1594.
• ‒ Operate starter for a few seconds. The engine can be allowed to start.

• Specification: 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 valve.
• ‒ Test for open circuit in wiring between contact 1 of connector for camshaft adjustment valve and fuse.

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

• ‒ Test fuel pump relay and activation
  => Page 24-46.

Testing activation of camshaft timing control

• ‒ → Connect diode test lamp V.A.G 1527 to contact 1 (positive) and contact 2 on valve connector using test leads from auxiliary cable set V.A.G 1594.
• ‒ Start final control diagnosis and select camshaft timing control => Page 01-79.

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

• ‒ If the diode test lamp does not flash or if it lights up continuously, connect test box V.A.G 1598/22 to wiring harness for engine control unit => Page 24-24.

• ‒ → If the diode test lamp lights up continuously, test for short to earth in wiring from contact 2.

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

• ‒ If the diode test lamp does not flash, test for open circuit or short to positive in wiring between contact 2 on connector and contact 55 on test box.

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

• ‒ Rectify any short circuits to earth or open circuits if found.
• ‒ If no short circuits or open circuits are found, fit a new engine control unit => Page 24-26.
• ‒ If the wiring connections are OK, fit a new mechanical camshaft adjuster

=> 6-cylinder engine (5-valve), Mechanics; Repair group 15; Cylinder head, valve gear; Removing and installing camshafts