Camshaft Adjustment Solenoid Valves, Checking

Camshaft adjustment solenoid valves, checking





Special tools and equipment
^ V.A.G 1526 A
^ V.A.G 1527 B
^ V.A.G 1594 A
^ V.A.G 1598/31
^ VAS 5051 with VAS 5051/1

Work sequence





Cylinder bank I (right):
- Disconnect connector -3- to Valve -1- for camshaft adjustment-N205-.





Cylinder bank 2 (left):
- Remove bolts (arrows) and coolant expansion tank -2-.
- Disconnect wire to Engine Coolant Level (ECL) warning switch -F66- and move aside coolant expansion tank with coolant hoses -1- and -3connected.





- Disconnect connector -4- to Valve -2- for camshaft adjustment -N208-.
Both sides (continued):
Checking internal resistance





- Connect multimeter to valve for resistance measurement.
^ Specification: 8 to 13 Ohms
If reading does not match specification:
- Replace valve.

If specified value is reached:
Checking power supply
Test requirements:
^ Fuse for camshaft adjustment solenoid valves OK
Refer to Wiring Diagrams
^ Fuel pump relay OK

Note: Camshaft adjustment solenoid valves are supplied with power by way of fuel pump relay.








- Connect up voltage tester VAG 1527 B as follows.
- Briefly operate starter.
^ LED must light
- Switch ignition off.

If LED does not light:
- Use wiring diagram to check for open circuit in wiring from contact 1 of connector via fuse to fuel pump relay.
- Use wiring diagram to eliminate open circuit in wiring.
If LED lights:

Checking actuation
^ Vehicle diagnostic, testing and information system VAS 5051 connected up; vehicle self-diagnosis and vehicle system "01 Engine electronics" selected. Ignition must be on.





- Connect voltage tester V.A.G. 1527 B to contacts 1 (positive) and 2 of connector.





Indicated on VAS 5051:
- From list -1- select diagnostic function "03- Final control diagnosis".
- Touch > key, until Valve -1- for camshaft adjustment -N205- is activated.
^ LED must flash
- Touch > key again, until Valve -2- for camshaft adjustment -N208- is activated.
^ LED must flash
- Terminate function "03- Final control diagnosis" by touching < key.
- Switch ignition off.

If LED does not flash or if it is permanently lit:





- Connect test box V.A.G. 1598/31 to wiring harness connectors. Actual engine control module is not to be connected. Connect ground (GND) clip of test box to ground (GND) (not shown in Fig.).

CAUTION: So as not to destroy electronic components, select required measuring range before connecting test leads and observe test conditions.





- Check for open circuit and short to ground/positive in the following wiring.





Intake camshaft adjustment valve 1 -N205- or 2 -N208-

- Use wiring diagram to eliminate open circuit in wiring/short circuit.
If wiring is OK
- Replace engine control module.

If no fault is found:
- Replace mechanical camshaft adjuster.