Valves For Camshaft Adjustment, Checking

Valves For Camshaft Adjustment, Checking

- Connect VAG1551/1552 Scan Tool (ST) and press buttons -0-and -1- to insert "Engine Electronics" address word 01 (with engine running at idle). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551/1552 Scan Tool" Testing and Inspection

Indicated on display


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -3- to select "Output Diagnostic Test Mode" function 03.

Indicated on display


Rapid data transfer Q
03 - Output Diagnostic Test Mode


- Press -Q- button to confirm input.

Indicated on display


Output Diagnostic Test Mode ->
Camshaft adjustment 1


- Check using output DTM and activate camshaft adjustment. Refer to "Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03)" Testing and Inspection
Valves 1 and 2 for camshaft adjustment, -N205- and -N208-, must click audibly.

If the valves do not click:
- Check as described in test procedures that follow.

Checking solenoid valves for camshaft adjustment electrically
- Disconnect harness connector from valve.







- Using multimeter with auxiliary wires from VAG1594, measure resistance across terminals on valve.
Specified value: 10-18 ohms

If resistance is not as specified:
- Replace solenoid valve.

Checking voltage supply of valves for camshaft adjustment
- Disconnect harness connector from valve.







- Connect LED tester VAG1527 between engine ground and terminal 1 of connector (B+).
- Crank starter for several seconds (engine can start).
LED in voltage tester must light up.

If LED does not light up, conduct the following tests:
- Check fuse for valves for camshaft adjustment.
- Check wiring from terminal 1 on 2-pin connector to fuse for continuity per wiring diagram.
- Check fuel pump relay and signal to relay.Testing and Inspection

Checking signal to valves for camshaft adjustment
- Disconnect harness connector from valve.







- Connect LED tester VAG1527 between connector terminals 1 and 2.
- Check using output DTM and activate camshaft adjustment. Refer to "Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03)" Testing and Inspection
LED must flash.

If LED does not flash or stays on continuously:
- Connect VAG1598/22 test box to Motronic ECM harness connector and proceed as follows: Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/22 Test Box" Testing and Inspection

If LED does not flash:
- Check wiring from terminal 2 of connector for valve to terminal 55 of ECM/test box for continuity and short circuit to B+.

If LED stays lit constantly:







- Check wiring between valve connector terminal 2 and ECM/test box terminal 55 for short circuit to Ground.
Specified value: max. 1 Ohm.

If the wiring is OK:
- Replace Motronic ECM -J220-.
- Carry out adaptation of throttle valve control module to ECM.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" Testing and Inspection

If no malfunction has been found in any of the previous tests:
- Replace respective mechanical camshaft adjuster.