Compression, Checking
Special tools and workshop equipment required
- Spark Plug Removal Tool :3122B
- Compression Tester Kit :VAG1763
- Engine oil temperature: minimum 30 °C (86 °F)
- Battery voltage minimum 12.5 V.
-- Remove the fuse for the Fuel Pump Control Module -J538-. Refer to the appropriate wiring diagram.
-- Remove the ignition coils. Refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING .
-- Remove spark plugs with :3122B .
-- Check the compression using the :VAG1763 .
For information on using the tester. Refer to the Operating Instructions.
-- Have a second mechanic 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.
| Compression pressure | Bar (PSI) Pressure Engine Codes CEUC/CEUD/CTGE |
Engine codes CRDB/CWUB/CWUC |
|---|---|---|
| New | 10.0 (145) to 15.0 (217) | 9.0 (130) to 14.0 (203) |
| Wear limit | 9.0 (130) | 8.0 (116) |
| Maximum difference between cylinders | 3.0 (43) | 3.0 (43) |
Assembly is performed in the reverse order of disassembly, noting the following:
-- Install the spark plugs.
-- Install the ignition coils. Refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING .
-- Install the fuse for the Fuel Pump Control Module -J538-. Refer to the appropriate wiring diagram.
-- If there are any faults stored in the DTC memory that occurring during testing, erase them see Vehicle Diagnostic Tester.