Passat Syncro Wagon V6-2.8L (ATQ) (2000)
and Readiness Codes
If specified value is obtained:
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Check Ground (GND) activation of the respective oxygen sensor heater.
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Connect test box to control module wiring harness, connect test box for wiring test. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box,
Connecting For Wiring Test
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Check wires between test box and 4-pin connector to Engine Control
Module (ECM) for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohms
Vehicles with engine code AHA
Vehicles with engine code ATQ
Continuation for all vehicles
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Also check wires for short circuit to B+ or Ground (GND).
Specified value: Infinity Ohms
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Check wire between 4-pin connector terminal 1 and Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wires:
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Replace Motronic Engine Control Module (ECM) -J220-.
With Manufacturer's Scan Tool
Oxygen Sensor Heater For Heated Oxygen Sensors (HO2S) Before Catalytic Converter, Checking
When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Special tools and equipment
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V.A.G 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
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VAG 1598/31 test box
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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