Camshaft Adjustment Valves, Checking
Camshaft Adjustment Valves, Checking
Function
The camshaft adjustment is load- and RPM dependant. 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
- Respective fuses of camshaft adjustment valves in E-box (in plenum chamber, left side) must be OK:
- Motronic Engine Control Module (ECM) Power Supply Relay -J271- -position A3- must be OK, check:
- Ignition switched off.
Test sequence
- Disconnect 2-pin harness connector to the respective valve for camshaft adjustment:
1 - Valve -1- for camshaft adjustment, intake -N205-
2 - Camshaft Adjustment Valve 1 (exhaust) -N318-
NOTE: Before disconnecting harness connectors, mark allocation to component.
Checking resistances
- Measure resistance between terminals of the respective valve for camshaft adjustment.
Specified value: 10.0 to 18.0 ohm
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. Readiness Code
If specified value is obtained:
- Check wires according to wiring diagram.
Checking wiring
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
- Check wires between test box and 2-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohm
- Check the wire for short circuit to B+ and Ground (GND).
Specified value: infinity ohm
- 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. 1.5 ohm
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code
If no malfunctions are found in wires:
- Replace Motronic Engine Control Module (ECM) -J220-.