Camshaft Adjustment Valve Checking

Camshaft adjustment valve, checking

Function
The camshaft adjustment is load- and RPM dependent. The electrical valve for camshaft adjustment switches oil pressure onto camshaft adjuster (mechanical adjustment mechanism), which adjusts the camshaft.

Recommended special tools and equipment
- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1594 connector test kit
- Wiring diagram

Test requirements






- The respective fuses of the Valve -1- for camshaft adjustment -N205- must be OK.
- Fuel Pump (FP) Relay -J17- must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers like, for example, lights and rear window heating must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence






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

Specified value: 10 to 18 Ohms

If specified value is not obtained:

- Replace the valve for camshaft adjustment.

- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 4: Reset/Erase Diagnostic Data

- Generate readiness code.

If specified value is obtained:

- Connect test box to control module wiring harness harness.






- Check wire between test box socket 115 & 2-pin connector terminal 2 for open circuit according to wiring diagram.

Wire resistance: max: 1.5 Ohms.

- Also check wires for short circuit to B+ and Ground (GND).

Specified value: Infinity Ohms

- Check wire between 2-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.

Wire resistance: max: 1.5 Ohms

If resistances and wires are OK:

- Replace Motronic Engine Control Module (ECM) -J220-.