Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark plug removal tool (3122B)

• Puller for ignition coil (T10095A)

• Assembly tool (T10118)

• Torque wrench (5-50 Nm) (VAG 1331)

• Compression tester (VAG 1763)

Test Conditions

• Engine oil temperature at least 30 °C (86 °F).

• The battery voltage must be at least 11.5 volts.

Test Sequence

- Install the (T10118) on the release button - arrow -, release the electrical connector retainers, and carefully remove the connectors from the ignition coils 1 through 6.





- From the straight side of the electrical connector, push the (T10095 A) on in the - direction of the arrow -, and remove the ignition coil with power output stage.





- Remove fuse SC 27 from the fuse holder.

By removing the SC 27 fuse, the voltage supply to the fuel pump relay is interrupted.

- Remove the spark plugs using the (3122B).

- Check the compression using the (VAG 1763).

• Using the tester => Operating instructions.

- Operate the starter until the (VAG 1763) shows no further pressure increase.

Compression Pressure





- Thereafter, reinstall the spark plugs and the ignition coils with power output stages. Refer to => [ Ignition Coils with Power Output Stages ] Service and Repair.

After the test is completed:

- Perform a vehicle system test. Refer to " Guided Fault Finding".

- End the vehicle system test, this will automatically erase all Diagnostic Trouble Code (DTC) entries which occurred during the assembly.

- Generate a readiness code in connection with a road test.

Observe the safety precautions that apply to road tests.

- Perform a test drive.

- After that perform the vehicle system test again and repair any occurring malfunctions.