Timing Components: Testing and Inspection

Camshaft adjustment, checking

Only vehicles with engine code AWP, AWW
The camshaft adjustment is load and RPM dependent. The electrical valve for camshaft adjustment switches oil pressure onto camshaft adjuster (mechanical adjustment mechanisms), which adjusts the camshaft.

Special tools, testers and auxiliary items required
^ Fault Read Out Device V.A.G 1551 or Vehicle Diagnosis, Testing and Information System VAS 5051
^ Portable multimeter V.A.G 1526C
^ Connector test set V.A.G 1594C
^ Speed Adjuster Tool V.A.G 1788/10

Activation, checking
- First check camshaft adjuster solenoid valve activation via diagnostic test mode (DTM).

If control is OK:

Solenoid valve, checking





- Measure resistance between terminals of solenoid valve. Specification: 10 to 18 ^ (at room temperature)

If no malfunctions are found on valve:
- Check camshaft adjuster function.

Camshaft adjuster, checking function

Test conditions
^ Coolant temperature must be at least 85°C, Display group 04, display field 3

Test sequence
- Connect Fault Read Out Device V.A.G 1551 and select engine electronics control module with "Address word 01". Engine must run at idle for this. Connect Fault Read Out Device V.A.G 1551 and select engine control module.

Scan tool display:





- Press buttons 0 and 4 for function "Initiate basic setting" and press Q button to confirm input.

Scan tool display:





- Press buttons 0 9 and 4 for "Display group number 94" and confirm entry with Q button.

Scan tool display: (1 to 4 = display fields)





Engine code AWW
- Adjust engine speed with Speed Adjuster Tool V.A.G 1788/10 to 1800 to 2200 RPM.
- Hold speed at 1800 to 2200 RPM until display in display field 3 goes from "Test OFF" to "Test ON".
- Continue to hold speed at 1800 to 2200 RPM until specified value "Syst. OK" is shown in display field 3.

Reading results as described:
- Remove Speed Adjuster Tool V.A.G 1788/10 from gas pedal. Engine code AWP
- Press brake pedal and hold firmly.
- Press gas pedal into wide open throttle (WOT) position. The engine speed is raised to approx. 2300 RPM by engine control module.
- Hold brake and gas pedal down until display in display field 3 goes from "Test OFF" to "Test ON".
- Continue to hold brake and gas pedal until specified value "Syst. OK" is shown in display field 3.

Reading results as described:
- Release brake and gas pedals.

Continued for all engine codes
- Press -> key.
Scan tool display:





- Press buttons 0 and 6 for function "End output" and press Q button to confirm input.
- Switch ignition off.

If "Syst. not OK" is shown in display field 3, read out DTC memory.

These malfunctions can take place with malfunction code 17927:

The camshaft adjuster solenoid valve switches oil pressure correctly on mechanical camshaft adjuster but it cannot reach its end position (e.g. due to difficulty in moving).
- Replace camshaft adjuster.
- Check DTC memory.
- Read readiness code.
- If DTC memory was cleared or engine control module disconnected from voltage supply, readiness code must be regenerated.
- Repeat function test.

If specified value is not obtained again:
- Replace engine control module.