Camshaft Adjustment Valve 1, Checking

Camshaft Adjustment Valve -1-, Checking

Function
The camshaft adjustment is load- and RPM dependent. The electrical camshaft adjustment valves -1- 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
- Corresponding fuses on E-box in engine compartment, left side, for Camshaft Adjustment Valve 1 -N205- and Camshaft Adjustment Valve 1 (exhaust) -N318- must be OK.

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

- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence
Observe safety precautions.
Observe rules for cleanliness.







- Disconnect 2-pin harness connector to the respective camshaft adjustment valve -1-:
2 - Camshaft Adjustment Valve 1 -N205-
3 - Camshaft Adjustment Valve 1 (exhaust) -N318-

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

Checking resistance







- Check resistance between the corresponding valve terminals.

Specified value: 7.0 to 9.0 ohms

NOTE: Resistance value is valid at approx. 20 degrees C. At higher temperatures, resistance increases.

If specified value is not obtained:
- Replace control housing for camshaft adjustment.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified value is obtained:
- Check wire to Engine Control Module (ECM) according to wiring diagram.

Checking wire to Engine Control Module (ECM)
- Connect test box to 60-pin connector of wiring harness, connecting test box for wiring test. 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.

Wire resistance: max. 3.0 ohms







- Also 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 fuse holder for open circuit according to wiring diagram.

Wire resistance: max. 3.0 ohms

- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are found in wire:
- Replace Engine Control Module (ECM) -J623-