Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Connect test box V.A.G 1598/31 to control module wiring harness. The engine control module is not connected by this action.
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Check wiring for open circuit between test box and 3-pin connector using wiring diagram.
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Contact 1 + socket 108
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Contact 2 + socket 90
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Contact 3 + socket 82
Wire resistance: Max. 1.5 Ohms
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Additionally check wires for short to one another.
If no wiring problem is detected:
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Remove sender and check sender wheel for secure fit, damage and run-out.
NOTE: There is a larger gap on the sender wheel. This gap is the reference mark and does not mean that the sender wheel is damaged.
If no malfunction is detected on sender wheel:
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Replace Engine Control Module (ECM).