Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark Plug Removal Tool (3122 B)

• Compression Tester (V.A.G 1763)

Procedure

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

• Battery voltage at least 12.5 V.

- Disconnect the injector valve connector - 2 -.






• Ignore - 1, 3, 4 and 5 -.

- Remove ignition coils.

- Remove spark plugs with (3122 B).

- Check compression pressure with the (V.A.G 1763).

- Have a second technician press the accelerator pedal down all the way while operating the starter until the pressure increase is no longer displayed on the tester.

- Repeat procedure on each cylinder.






Assembling

Assemble in reverse order of disassembling. Note the following:

- Install spark plugs.

- Install ignition coils.

Faults are saved in Engine Control Module (ECM) when electrical connectors are disconnected:

- Connect vehicle diagnosis, testing and information system (VAS 5051B).

- Start "Guided Functions" operating mode.

- Generate readiness code in ECM.