Camshaft Adjustment Valve, Checking

Camshaft adjustment valve, checking





Special tools, testers and auxiliary items required
^ Multimeter VAG1526A
^ Voltage tester VAG1527B
^ Connector test kit VAG1594A
^ Adapter VAG1598/31

Requirement
^ Vehicle diagnostic, testing and information system VAS5051 or scan tool VAG1551 must be connected.

Work sequence
- Start output Diagnostic Test Mode and activate camshaft adjustment valve.

Indicated on display





^ This valve is actuated (clicks) for approx. 1 minute if key is not pressed beforehand to select next control element.

If valve is not actuated (does not click):

^ Check internal resistance of valve.

Checking internal resistance
- Switch off ignition.





- Disconnect connector - arrow - at camshaft adjuster.





- Connect multimeter and measure resistance at valve.

^ Specification: 10...18 Ohms

If reading does not match specification:

- Replace valve.

If measured value matches specification:

- Check power supply.

Checking power supply

Requirements
^ Fuse for camshaft adjustment valve
^ Fuel pump relay OK





- Disconnect connector - arrow - at camshaft adjuster.





- Connect voltage tester VAG 1527B as follows





- Briefly operate starter.

^ LED must light up

If LED does not light up:

- Check for open circuit in wiring from contact 1 of connector through fuse to fuel pump relay.
- If necessary, eliminate open circuit.

If LED lights up:

- Check actuation.

Checking actuation





- Connect voltage tester VAG 15278 to contact 1 (positive) and 2 of connector.
- Start output Diagnostic Test Mode and actuate camshaft adjustment valve.

Indicated on display





^ LED must flash

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

- Connect test box VAG 1598/31 to engine control module wiring harness. Engine control module must not be connected.





- Check for open circuit and short to Ground/positive in following wiring connection:





- Eliminate any short circuits to Ground or open circuits.

If wiring is OK:

- Replace engine control module.

If no malfunction is found:

- Replace mechanical camshaft adjuster.