Compression pressure, measuring

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Special tools, testers and auxiliary items required 

• Spark plug removal tool 3122 B
• Compression tester V.A.G 1763
• Puller T40039

Work procedure 

• Engine oil temperature at least 30° C.
• Battery voltage at least 12.5 V.

• Switch off ignition.
• Remove Engine Control Module (ECM) J623 → 24 - MULTIPORT FUEL INJECTION (MFI) .

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• Only remove smaller connector - 1  - from engine control module (ECM) by removing connector lock - arrow  -.

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• Free up fuel line and line to EVAP canister on air guide pipe.
• Disconnect electrical harness connector - 1  - at Mass Air Flow (MAF) Sensor G70.
• Remove vacuum line - 4  - to air guide hose from suction jet pump.

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• Remove oil dipstick - 1  - from guide tube.
• Remove bolts - 2 and 3  -.
• Disconnect electrical harness connectors at ignition coils.
• Press electrical wiring harness to side.

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• Remove bolts - 1 and 2  -.
• Disconnect electrical harness connectors at ignition coils.
• Press electrical wiring harness to side.

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• Remove all ignition coils using Ignition Coil Puller T40039.
• Remove spark plugs using Spark Plug Removal Tool 3122 B.
• Check compression using compression tester V.A.G 1763.

Assembly is in reverse order of removal, note the following:

• Install sparks plugs 404.
• Install Engine Control Module (ECM) J623 → 24 - MULTIPORT FUEL INJECTION (MFI) .

Faults are saved in ECM when electrical connectors are disconnected:

• Connect Vehicle Diagnosis, testing info. system VAS 5051.
• Start "Guided Functions" operating mode.
• Generate readiness code in ECM.