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
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

Test requirements







- The respective fuses of 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 such as, lights and rear window defroster 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 for camshaft adjustment -2

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







- 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 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. Monitors, Trips, Drive Cycles and Readiness Codes

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

Vehicles with engine code AHA







- Check wire between test box socket 55 + 2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms

Vehicles with engine code ATQ







- 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

Continuation for all vehicles
- Also check wires for short circuit to B+ and to Ground (GND).
Specified value: Infinite 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-.