Beetle L4-2.0L (AEG) (2000)
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Connect VAG 1598/22 Test Box to ECM wiring harness.
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Check wiring for open circuit between Test Box and 4-pin harness connector to ECM using Wiring diagram.
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Terminal 3 + socket 25
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Terminal 4 + socket 26
Wire resistance: 1.5 Ohms maximum
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Check wiring at 4-pin connector for shorts to one another.
Terminal 4 + socket 25 specification: Infinity Ohms
If wiring OK:
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Replace Engine Control Module.