Camshaft Adjustment Valves, Checking

Camshaft Adjustment Valves, Checking

Function
The camshaft adjustment is load- and RPM dependent. The electrical valves for camshaft adjustment switch oil pressure onto camshaft adjusters (mechanical adjustment mechanisms), which then adjust the camshafts.

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements







- Respective fuses of camshaft adjustment valves in fuse box (instrument panel, left) must be OK:
- Ignition switched off.

Test sequence

Cylinder bank 1







- Disconnect 2-pin connector from Valve - 1 - for camshaft adjustment - N205 - (arrow).

Cylinder bank 2







- Disconnect 2-pin connector from Valve - 2 - for camshaft adjustment - N208 - (arrow).

Cylinder bank 1 and 2

NOTE:
- Cylinder bank 1 = in direction of travel, right.
- Cylinder bank 2 = in driving direction, left.

Checking resistances







- Measure resistance between terminals of the respective valve for camshaft adjustment.

Specified value: 10.0 to 18.0 ohms.

If specified value is not obtained:
- Replace the camshaft adjuster with the respective Valve - 1 - for camshaft adjustment - N205 -/Valve - 2 - for camshaft adjustment - N208 -:
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified value is obtained:
- Check wires according to wiring diagram.

Checking wiring
- Connect test box to control module wiring harness. Connecting Test Box For Wiring Test







- Check wires between test box and 2-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.

Wire resistance: max. 1.5 ohm.s

Cylinder bank 1







Cylinder bank 2







Cylinder bank 1 and 2
- Also check wires for short circuit to B+ or Ground (GND).

Specified value: infinity ohms.







- Check wire between 2-pin connector terminal 1 and Motronic Engine Control Module (ECM) Power Supply Relay - J271 - for open circuit according to wiring diagram.

Wire resistance: max. 1.5 ohms.

- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are detected in the wires and the resistance value is OK:
- Replace Motronic Engine Control Module (ECM) - J220 -.