With Generic Scan Tool

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







- The respective fuses of the Valve -1- for camshaft adjustment -N205- and Valve -2- for camshaft adjustment -N208- must be OK.
- Fuel Pump (FP) Relay -J17- must be OK, check.
- 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







- Disconnect 2-pin harness connector -1- to the respective Valve -2- for camshaft adjustment:

NOTE: Before disconnecting harness connectors, mark allocation to component.







- Measure resistance between terminals of the respective valve for camshaft adjustment.
Specified value: 10...18 Ohm

If specified value is not obtained:
- Replace the respective Valve -1- for camshaft adjustment -N205-/Valve -2- for camshaft adjustment -N208-.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Readiness Code, Generating

If specified value is obtained:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test

Valve -1- for camshaft adjustment -N205-







- Check wire between test box socket 22 & 2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
- Also check wires for short circuit to B+ and Ground (GND).
Specified value: Infinite Ohm
- 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 Ohm

If voltage supply and wires are OK:
- Replace Motronic Engine Control Module (ECM) -J220-.

Valve -2- for camshaft adjustment -N208-







- Check wire between test box socket 18 &2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
- Also check wires for short circuit to B+ and Ground (GND).
Specified value: Infinite Ohm
- 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 Ohm

If voltage supply and wires are OK:
- Replace Motronic Engine Control Module (ECM) -J220-.