Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598/31
• ◆ VAS 5051

• or

• ◆ V.A.G 1551 with V.A.G 1551/3 A

• ‒ Start final control diagnosis and select solenoid valves for camshaft adjustment.

=> Motronic injection and ignition system; Repair group 01; Final control diagnosis

If one of the valves is not activated (does not click) during final control diagnosis:

Testing internal resistance

• ‒ Switch off ignition.
• ‒ → Unscrew bolts -arrows- and remove engine cover panels -A...C-.

• ‒ → Remove air duct -arrows-.

• ‒ Unplug electrical connector on relevant solenoid valve.
• ‒ → Connect multimeter to valve (resistance measurement range)
• ‒ Specification: 10 ... 18ω

If the specification is not obtained:

• ‒ Fit a new valve.

Checking voltage supply

• ‒ Unplug connector on relevant valve.
• ‒ → Connect voltage tester V.A.G 1527 B as follows:

• ‒ Operate starter briefly.
• ‒ The LED should light up.

If the LED does not light up:

• ‒ Carry out the following tests (marked with dots):

• ● Check fuse for solenoid valves for camshaft timing control.

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

• ● → Test for open circuit in wiring from fuel pump relay to connector contact 1 via fuse -S234 (socket 34 in fuse box):

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

• ‒ Rectify any open circuits.

If no fault is found:

• ‒ Test fuel pump relay.

=> Motronic ignition and injection system; Repair group 24; Servicing Motronic injection system; Testing fuel pump relay and activation.

Testing activation

• ‒ → Connect voltage tester V.A.G 1527 B between contacts 1 (positive) and 2 using test cables from V.A.G 1594 A.
• ‒ Start final control diagnosis and activate solenoid valves for camshaft timing control.

=> Motronic injection and ignition system; Repair group 01; Final control diagnosis

• ‒ The LED should flash.

If the LED lamp does not flash or if it lights up continuously:

• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit.Do notconnect to the engine control unit itself.

=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection system; Testing fuel pump relay and activation

• ‒ → Test for open circuit and short to positive or earth in the following wiring connections:

Inlet camshaft timing adjustment valve -1- -N205 and inlet camshaft timing adjustment valve -2- -N208

• ‒ Eliminate open circuit or short circuit to earth if necessary.

If the wiring is OK:

• ‒ Fit a new engine control unit

=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection and ignition system; Renewing engine control unit

If no fault is found:

• ‒ Install a new mechanical camshaft adjuster.