volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 5388 > < Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 5386
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Check wire connections from
Engine codes AEB, ATW: Terminal 1
Engine code AUG, AWM: Terminal 3to Fuel Pump (FP) Relay -J17- according to wiring diagram.

If voltage was approximately same as battery voltage:

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Switch ignition off.

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Connect test box to control module wiring harness, connect test box for wiring test. Engine Control Module ECM) is not connected. See: Testing
and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring Test

Vehicles with engine code AEB

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Check wire between test box and 4-pin connector for open circuit according to wiring diagram.
Terminal 2 + socket 27
Wire resistance: max: 1.5 ohms

Vehicles with engine code ATW

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Check wire between test box and 4-pin connector for open circuit according to wiring diagram.
Terminal 2 + socket 5
Wire resistance: max: 1.5 ohms

Vehicles with engine code AUG, AWM

Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 5388 > < Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 5386