Camshaft Adjustment Valve 1, Checking

Camshaft Adjustment Valve 1, Checking

Function
The camshaft adjustment is load- and RPM dependant. The electrical camshaft adjustment valve 1 switches oil pressure onto camshaft adjuster (mechanical adjustment mechanism), which adjusts the camshaft.

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

Test requirements







- Corresponding fuses on E-box in engine compartment, left side, for Camshaft Adjustment Valve 1 -N205- must be OK:

NOTE: Fuses on this fuse holder are labelled "SB" in the wiring diagram.

- Motronic Engine Control Module (ECM) Power Supply Relay -J271- (relay position R4) must be OK, check:
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence
Observe safety precautions.
Observe rules for cleanliness.

- Remove engine cover, removing and disassembling air filter/engine cover.







- Disconnect 2-pin connector -1- from Camshaft Adjustment Valve 1 -N205-.

Checking resistance
- Check resistance between valve terminals.

Specified value: 7.0 to 15.0 Ohms

If specified value is not obtained:
- Replace Camshaft Adjustment Valve 1 -N205-.
- 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 to Engine Control Module (ECM) according to wiring diagram.

Checking wires to Engine Control Module (ECM)
- Connect test box to 60-pin connector of wiring harness. Test Box, Connecting For Wiring Test

Engine Control Module (ECM) is not connected.







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

Terminal 2 + socket 20

Wire resistance: max. 3.0 Ohms

- Check the wire for short circuit to B+ and to 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. 3.0 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 found in wires:
- Replace Engine Control Module (ECM) -J623-.