Checking camshaft adjustment valve: Audi 1.8 (ADR)

Special tools and workshop equipment required

V.A.G 1526 A
V.A.G 1527 B
V.A.G 1594 A
V.A.G 1598/22

Start final control diagnosis and actuate the camshaft adjustment valves:

=> Motronic Injection and Ignition System (4-cyl., 5-valve); Repair Group 01; Final control diagnosis
Motronic Injection and Ignition System (4-cyl., 5-valve)
Final control diagnosis

If valve does not click in final control diagnosis:

Checking internal resistance

Switch off ignition.
Remove engine covers -arrows-.

Unplug connector from solenoid valve.

Connect multimeter to valve for resistance measurement.
Specification: 10 ... 18 ω

If readout does not match specification:

Replace valve.

Checking power supply

Unplug connector from solenoid valve.

Connect voltage tester V.A.G 1527 B as follows.

Connector / Contact · Measure to
1 · Engine earth

Briefly operate starter.
LED must light up

If LED does not light up:

Perform the following checks marked with a dot.

Check fuse for camshaft adjustment valve:

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder

Check wiring from contact 1 of connector via camshaft adjustment valve fuse to fuel pump relay for open circuit:

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder

Repair open circuit in wiring as necessary.

If no fault is found:

Check fuel pump relay:

=> Motronic Injection and Ignition System (4-cyl., 5-valve); Repair Group 24; Servicing Motronic Injection System ; Checking fuel pump relay and actuation
Motronic Injection and Ignition System (4-cyl., 5-valve)
Servicing Motronic Injection System
Checking fuel pump relay and actuation

Checking actuation

Connect voltage tester V.A.G 1527 B to contacts 1 (positive) and 2 of connector.
Start final control diagnosis and actuate the camshaft adjustment valves:

=> Motronic Injection and Ignition System (4-cyl., 5-valve); Repair Group 01; Final control diagnosis
Motronic Injection and Ignition System (4-cyl., 5-valve)
Final control diagnosis

LED must flash

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

Connect test box V.A.G 1598/31 to engine control unit wiring harness. Engine control unit must not be connected:

=> Motronic Injection and Ignition System (4-cyl., 5-valve); Repair Group 24; Servicing Motronic Injection System ; Wiring and component check with test box V.A.G 1598/22
Motronic Injection and Ignition System (4-cyl., 5-valve)
Servicing Motronic Injection System
Wiring and component check with test box V.A.G 1598/22

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

Connector / Contact · Test box V.A.G 1598/22 / Socket
2 · 55

Repair short to earth/open circuit in wiring as necessary.

If wiring is OK:

Replace engine control unit:

=> Motronic Injection and Ignition System (4-cyl., 5-valve); Repair Group 24; Servicing Motronic Injection System ; Replacing engine control unit
Motronic Injection and Ignition System (4-cyl., 5-valve)
Servicing Motronic Injection System
Replacing engine control unit

If no fault is found:

Replace mechanical camshaft adjuster.