With Generic Scan Tool
Solenoid Valve For Camshaft Adjustment, Checking
Recommended special tools and equipment
- VAG1526A multimeter
- V.A.G 1527 B Voltage Tester
- VAG1594A connector test kit
- VAG1598/31 test box
Test requirements:
- Fuse for solenoid valve for camshaft adjustment OK.
- Motronic Engine Control Module (ECM) Power Supply Relay -J271- OK.
- Ignition switched off.
NOTE: Voltage for camshaft adjustment solenoid valves is supplied via Motronic ECM power supply relay.
Procedure
Cylinder bank 2 (left):
- Remove cover -1- in engine compartment (left side).
- Remove coolant reservoir (arrow)
- Disconnect wire from Engine Coolant Level (ECL) Warning Switch -F66- and lay coolant reservoir to side.
NOTE: Coolant hoses -1- to -3- remain connected.
Cylinder bank 1 (right):
- Remove cover -1- in engine compartment (right side).
- Remove bolts (arrows).
- Remove air guide -1-.
- Detach Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- (-1-) at air filter housing.
- Remove air filter housing (arrows).
Continuation for both sides:
- Disconnect harness connector (arrow) from connector-adapter.
NOTE: Illustration depicts cylinder bank 2 (left).
Checking internal resistance
Valve for camshaft adjustment (intake):
- Connect multimeter between terminal 1 and 2 for resistance measurement.
- Specified value: 7.4 ... 8.2 Ohms
Valve for camshaft adjustment (exhaust):
- Connect multimeter between terminal 2 and 3 for resistance measurement.
- Specified value: 12,8 ... 14,2 Ohms
All:
If specified value is not obtained:
- Replace the respective solenoid valve for camshaft adjustment.
If specified value is obtained:
Checking voltage supply
- Connect e.g. V.A.G 1527 B voltage tester as follows:
Harness connector Measure to
Terminal
2 Engine Ground (GND)
- Switch ignition on.
- LED must light up.
- Switch ignition off.
If LED does not light up:
- Check wire connection from terminal 2 of harness connector via fuse to Motronic Engine Control Module (ECM) Power Supply Relay -J271- for open circuit according to wiring diagram:
- Specified value: Wire resistance max 1.5 Ohms
- If necessary, repair wire connection.
If voltage supply is OK:
Checking control wire
- Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected. Test Box, Connecting For Wiring Testing
- Check the following wire connections for open circuit according to wiring diagram:
- Specified value: Wire resistance max 1.5 Ohms
- Also check wires for short circuit to each other as well as to B+ and Ground (GND).
- Specified value: Infinity Ohms (no continuity)
- If necessary, repair wire connection.
If no malfunctions are found in wires:
- Replace Engine Control Module (ECM).
If no malfunctions are detected:
- Replace mechanical camshaft adjuster.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1 - Check DTC memory, Diagnostic mode 3 - Check DTC memory. Diagnostic Mode 3: Check DTC Memory
2 - Erase DTC memory, diagnostic mode 4 - Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
3 - Generate readiness code. Readiness Code, Generating
- End diagnosis and switch ignition off.