Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
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Disconnect 4-pin connector (black) for HO2S -G108- (arrow).
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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 39
Connector terminal 4 to ECM/test box socket 40
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 39
Specified value: Infinity Ohms
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Check wiring for short circuits to wiring harness shielding.
Connector terminal 3 to ECM/test box socket 14
Connector terminal 4 to ECM/test box socket 14
Specified value: Infinity Ohms
If wiring is OK:
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Replace Motronic ECM -J220-. See: Computers and Control Systems/Engine Control Module/Service and Repair
With Generic Scan Tool
Oxygen Sensor and oxygen sensor control behind Three Way Catalytic Converter (TWC), checking
NOTE: 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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V.A.G 1526 multimeter or V.A.G 1715 multimeter
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V.A.G 1594 Connector test set
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Wiring diagram