New Beetle L4-2.0L (AZG) (2003)
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Connect test box V.A.G 1598/31 to control module wiring harness. Engine control module is not connected by this action.
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Check wiring for open circuit between test box and 4-pin connector to Motronic control module using wiring diagram.
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Terminal 3 + socket 68
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Terminal 4 + socket 69
Wire resistance: Max. 1.5 Ohms
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Additionally check wiring for short to one another, and for short to battery positive or ground (GND).
Specification: Infinity Ohms
If no wiring problem is detected:
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Replace Engine Control Module (ECM).
With Generic Scan Tool
Oxygen Sensor Heater For Oxygen Sensor Before Three Way Catalytic Converter (TWC), Checking
NOTE:
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Vehicle must be raised before connector for oxygen sensor is accessible.
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When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Recommended special tools and equipment
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VAG 1526 multimeter or VAG 1715 multimeter
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VAG 1594 connector test kit
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Wiring diagram
Test requirements