Beetle L4-2.0L (AEG) (2000)
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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 51
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Terminal 4 + socket 52
Wire resistance: maximum: 1.5 Ohms
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Also check wiring at 4-pin harness connector for shorting to one another.
Terminal 4 + socket 51 specification: Infinity Ohms
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Check shield for short to sensor wiring using wiring diagram.
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Terminal 4 + socket 14
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Terminal 3 + socket 14
Specification: Infinity Ohms
If wiring OK:
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Replace Engine Control Module.