Camshaft Adjustment Valve, Checking

Camshaft adjustment valve, checking
Special tools and repair equipment required





^ VAG 1526 A
^ VAG 1527 B
^ VAG 1594 A
^ VAG 1598/31

Test requirement:
Vehicle diagnostic, testing and information system VAS 5051 or scan tool VAG 1551 must be connected.

Test 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.





^ Unplug 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
Test requirements:
^ Fuse for camshaft adjustment valve OK
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations
^ Fuel pump relay OK





^ Unplug 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.
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations
^ 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.
^ 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; Wiring and component check using test box VAG 1598/31








^ Check for open circuit and short to Ground/positive in the 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.