Camshaft Adjustment Valve, Checking

Camshaft adjustment valve, checking

Special tools and repair equipment required:

^ VAG 1526 A Multimeter
^ VAG 1527 B Voltage tester
^ VAG 1594 A Connector test kit
^ VAG 1598/31 Adapter

Requirement
^ Vehicle diagnostic, testing and information system VAS 5051 or scan tool VAG 1551 must be connected.

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

Indicated on display
^ This valve is actuated (clicks) for approximately 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 OK
^ Fuel pump relay OK

- Disconnect connector (arrow) at camshaft adjuster.

- Connect voltage tester VAG 1527 B 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 1527 B to contact 1 (positive) and 2 of connector.
- Connector contact

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.