Compression, checking
Test requirements
- Engine oil temperature not less than 30° C
Test sequence
- Remove engine cover.
- Pull connector off Camshaft Position (CMP) Sensor -G40- (arrow).
- With ignition switched off, disconnect connectors from ignition coils.
- Remove ignition coils.
- Remove spark plugs with spark plug wrench 3122B.
- Fully open throttle valve.
- Check compressions with compression tester VAG 1381/VAG 1763.
NOTE:
Using the compression tester
Refer to Operating instructions
- Operate starter until tester shows no further pressure increase.
Compression pressure:
| New bar | Wear limit bar | Permissible Difference between cylinders bar |
| 10.0 - 13.0 | 7.0 | max. 3.0 |
- Install spark plugs and ignition coils.
- Interrogate DTC memory:
Refer to
- 01 ON BOARD DIAGNOSTIC (OBD) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMU
- 01 ON BOARD DIAGNOSTIC (OBD) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): ATC
- 01 ON BOARD DIAGNOSTIC (OBD) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AWP
- 01 ON BOARD DIAGNOSTIC (OBD) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): BEA
NOTE:
DTCs will have been stored in the memory because the connector to the Camshaft Position (CMP) Sensor has been disconnected. Therefore interrogate and erase DTC memory after the test.
Tightening torque
| Component | Nm |
| Ignition coils to cylinder head | 10 |
| Spark plugs to cylinder head | 30 |
| Vacuum reservoir to cylinder head | 30 |