Cam Adjustment Valve 1 -N205- & Valve 2 -N208-

Valve 1 for camshaft adjustment -N205- and Valve 2 for camshaft adjustment - N208-, checking

- Switch ignition on.
- Perform Output Diagnostic Test Mode (DTM) and actuate valves for camshaft adjustment. Output Diagnostic Test Mode (DTM) (Function 03)

Indicated on display


Output Diagnostic Test Mode ->
Valve 1 for camshaft adjustment


Upon actuation of camshaft timing control, both valves should give a clearly audible click.

If specified value is not attained, perform the following tests:

Checking valves for camshaft adjustment electrically
- Disconnect connector from relevant valve for camshaft adjustment.







Measure resistance between contacts on valve using hand-held multimeter VAG 1526.
Specified value: 10 ... 18 ohm.

If specification is not attained:
- Replace relevant valve for camshaft adjustment.

Testing voltage supply valves for camshaft adjustment
- Disconnect connector from relevant valve.







- Connect diode test lamp VAG 1527 between engine Ground and socket 1 (positive) on connector using cables from adapter set VAG 1594.
- Operate starter for a few seconds. Engine may start.
Diode test lamp should illuminate.

If the diode test lamp does not illuminate, perform the following tests:
- Check fuse for valves for camshaft adjustment.

If the fuse is OK:







- Check wiring from socket 1 via fuse to fuel pump relay for continuity.

Checking actuation of valves for camshaft adjustment
- Disconnect connector from relevant valve.







- Connect diode test lamp VAG 1527 between sockets 1 (positive) and 2 on connector valve using cables from adapter set VAG 1594.
- Perform Output Diagnostic Test Mode and actuate valves for camshaft adjustment. Output Diagnostic Test Mode (DTM) (Function 03)

Indicated on display


Output Diagnostic Test Mode ->
Valve 1 for camshaft adjustment


Diode test lamp should flash on and off upon actuation of camshaft timing control.
If the diode test lamp is continuously lit:

If the diode test lamp does not flash:







- Check wiring connections from socket 2 of relevant connector for valve for camshaft adjustment for Ground short.

If the diode test lamp does not flash:
- Check wiring.

Checking wiring
- Connect test box VAG 1598/31 to wiring harness for engine control unit; do not connect engine control module. Connecting VAG 1598/31 Test Box







- Check wiring connection of relevant connector for valve for camshaft adjustment for open circuits as well as short to positive.

Vehicles up to model year 2001
Valve 1 for camshaft adjustment -N205- and Valve 2 for camshaft adjustment -N208-

2-pin connector on
wiring harness, contact. Test box VAG 1598/31, socket
2 115

Wire resistance: max. 1.5 Ohm
- Correct any open/short circuit as necessary.

Vehicles from model year 2002
Valve 1 for camshaft adjustment -N205-

2-pin connector on
wiring harness, contact. Test box VAG 1598/31, socket
2 115

Wire resistance: max. 1.5 Ohm
- Correct any open/short circuit as necessary.

Valve 2 for camshaft adjustment -N208-

2-pin connector on
wiring harness, contact. Test box VAG 1598/31, socket
2 120

Wire resistance: max. 1.5 Ohm
- Correct any open/short circuit as necessary.

If no short circuit or open circuit is found, replace engine control module.

- If none of tests already performed indicate a malfunction, then replace mechanical camshaft adjuster.