Golf GL L4-2.0L (AZG) (2001)
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Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
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Check wire between test box and 4-pin connector for open circuit according to wiring diagram.
Terminal 2+socket 63
Wire resistance: max: 1.5 Ohms
If wiring is OK:
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Replace Engine Control Module (ECM).
With Generic Scan Tool
Oxygen Sensor And Oxygen Sensor Control Behind 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 3 and 4 in harness connector of Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirements