Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark plug removal tool (3122B)

• Ignition coil puller (T40039)

• Torque wrench (5-50 Nm) (VAG 1331)

• Compression tester (VAG 1763)

• Adapter (VAG 1381/5A)

Conditions

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

• Voltage supply OK.

- Remove the engine cover.

- Disconnect the connectors from the fuel injectors.

- Remove the ignition coils with power output stages. Refer to => [ Ignition Coils with Power Output Stages ] Service and Repair.

- Remove the spark plugs using (3122B).

- Check the compression using (VAG 1763) and (VAG 1381/5A).

• Using the tester, refer to the operating instructions.

- Have a second technician operate the starter.

- Operate the starter until the tester shows no further pressure increase.

Compression Pressure





- To conclude work, erase the Diagnostic Trouble Code (DTC) memory of the Engine Control Module (ECM) since malfunctions were stored by disconnecting the connectors. Refer to => [ Engine Control Module DTC Memory, Checking and Erasing ] Reading and Clearing Diagnostic Trouble Codes.