Audi Workshop Service and Repair Manuals

Test conditions

• ● Coolant temperature at least 80 °C

Special tools, testers and auxiliary items

• ◆ Fault reader V.A.G 1551 (or vehicle system tester V.A.G 1552) with cable V.A.G 1551/3

• ‒ Connect fault reader V.A.G 1551
  .
• ‒ Start the engine.
• ‒ Select "Read measured value block", Display Group 027, engine at idling speed.

• ‒ Observe readout in display zones 1, 3 and 4.

Notes:

• ◆ Display zone 1 shows the status of the camshaft timing control.
• ‒ "0" = camshaft timing control not being activated
• ‒ "1" = camshaft timing control activated
  ("1" will only appear on the fault reader display during a test drive.)
• ◆ The positions marked "X" in display zone 1 are of no relevance when testing the camshaft timing control.
• ◆ Display zones 3 and 4 indicate whether or not the camshaft positions have actually been adjusted (feedback signal):
• ‒ Normal position: -3.0° ... 6.0° crankshaft angle
• ‒ Adjusted position: 16.0° ... 25.0° crankshaft angle

Specifications (with engine idling):

• ‒ Take the vehicle for a test drive.

• ‒ Accelerate rapidly from standstill in 1st gear.

Specifications (during test drive):

Notes:

• ◆ If a value of between 6.0 °/crankshaft and 16.0 °/crankshaft appears in display zone 3 and/or display zone 4 during the test drive, this means that the camshaft adjustment solenoid valves are diverting the oil pressure to the appropriate mechanical camshaft adjuster correctly, but that the mechanical adjuster is not reaching its end stop position (e.g. because it is not moving freely).

• ‒ If the values do not match the specifications, test the solenoid valves for camshaft adjustment .