Camshaft Adjustment, Checking

Camshaft adjustment, checking

Only vehicles with engine codes: AWP, AWV

The adjustment of the camshaft occurs dependent upon load and engine RPM. The electrical valve for camshaft adjustment directs oil pressure to the camshaft adjuster (mechanical adjustment device), which then moves the camshaft.

Special tools and equipment
- VAG1551 Scan Tool or VAG1552 vehicle system tester with VAG1551/3 cable
- Hand multimeter VAG1526 or multimeter VAG1715
- Adapter set VAG1594
- VAG1788/10 Engine speed adjuster

Checking activation
- Check activation of solenoid valve for camshaft adjustment via Output Diagnostic Test Mode.
If activation is OK:

Checking solenoid valve






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

If valve is not faulty:

- Check function of camshaft adjuster.

Checking function of camshaft adjuster

Test conditions
- Coolant temperature must be at least 85°, =>display group 04, display zone 3

Test sequence
- Connect VAG1551 Scan Tool (or VAG1552). Start engine and select Engine Control Module with "Address word" 01. Connecting scan tool and selecting Engine Control Module:

Indicated on display:





- Press buttons -0- and -4- for function "Introduction of basic setting" and confirm entry with -Q- button.

Indicated on display:




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

Indicated on display: (1 to 4 = Display zones)





- Set engine speed to 1800 to 2200 RPM using speed regulator VAG1788/10:

- Maintain engine speed at 1800 to 2200 RPM until display in display zone 3 jumps from
"Test OFF" to "Test ON".

- Continue to maintain speed at 1800 to 2200 RPM until specification
"Syst. OK" appears in display zone 3.

If the display does not indicate as described:
- Remove engine speed adjuster VAG1788/10 from accelerator pedal.
- Press --> button.

Indicated on display





- Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.
- Switch ignition off.

If "Syst. "nOK" appears in display zone 3:
- Read DTC memory.

If the DTC 17927 appears, it may be because:
The camshaft adjuster solenoid valve correctly switches oil pressure to the mechanical camshaft adjuster but it cannot reach its end position (e.g. tight/partially seized).

- Replace camshaft adjuster.
- Check DTC memory:
- Read readiness code:

If the DTC memory has been erased or the Engine Control Module separated from permanent (battery) positive, the readiness code must be generated again.

- Repeat functional check.

If the specification is not attained:
- Check wiring for open/short circuit between Engine Control Module to camshaft adjuster solenoid valve using wiring diagram:

If no wiring problem is detected:
- Replace Engine Control Module.