Beetle L4-2.0L (AEG) (2000)
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Check wires between test box and 4-pin connector (to control module) for open circuit according to wiring diagram.
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Terminal 3 + socket 51
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Terminal 4 + socket 52
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Wire resistance: max. 1.5 Ohms
Vehicles with engine code AVH, AZG, BDC
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Check wires between test box and 4-pin connector (to control module) for open circuit according to wiring diagram.
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Terminal 3 + socket 68
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Terminal 4 + socket 69
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Wire resistance: max. 1.5 Ohms
Continuation for all vehicles
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Also check wires for short circuit to B+ and Ground (GND). Specified value: Infinite Ohms
If no malfunctions are found in wires:
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Replace Motronic Engine Control Module (ECM) -J220-.
With Manufacturer Scan Tool
Oxygen Sensor and Oxygen Sensor Control After Three Way Catalyst, Checking
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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VAG 1551/1552 Scan Tool using VAG 1551/3 Adaptor cable
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VAG 1598/22 Test Box
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Fluke 83 multimeter
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VW 1594 Adaptor kit
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Wiring diagram
Requirements
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Engine Control Module MUST be matched to the Throttle Control Module.
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Exhaust system between Three Way Catalyst and cylinder head must be free of leaks
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Engine Coolant Temperature must be 85 °C minimum See Display group 04, Display field 3.
Functional check
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Connect VAG 1551/1552 Scan Tool. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", See: Testing and Inspection