volkswagen Workshop Repair Guides

Volkswagen Passat Syncro Wagon V6 28L Repair Manuals & Service Guide

Oxygen Sensor & O2S Control Before Three Way Catalytic Converter (TWC), Checking|Page 1495 > < Oxygen Sensor & O2S Control Before Three Way Catalytic Converter (TWC), Checking|Page 1493
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Check wiring for open circuit between ECM/test box and 4-pin HO2S harness connector (to ECM).
Connector terminal 3 to ECM/test box socket 25
Connector terminal 4 to ECM/test box socket 26
Specified value: max. 1.5 Ohms

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Check wiring for short circuits between terminals of 4-pin connector, and ECM/test box.
Connector terminal 4 to ECM/test box socket 25
Specified value: Infinity Ohms

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Check wiring for short circuits to wiring harness shielding.
Connector terminal 4 to ECM/test box socket 14
Connector terminal 3 to ECM/test box socket 14
Specified value: Infinity Ohms

If wiring is OK:
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Replace Motronic ECM -J220-.  See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and Repair

HO2S wiring, bank 2, sensor 1, checking

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Connect VAG1598/22 test box to ECM harness connector.

Oxygen Sensor & O2S Control Before Three Way Catalytic Converter (TWC), Checking|Page 1495 > < Oxygen Sensor & O2S Control Before Three Way Catalytic Converter (TWC), Checking|Page 1493