volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Oxygen Sensor Heater For Oxygen Sensors Before Catalytic Converter, Checking|Page 5903 > < Oxygen Sensor Heater For Oxygen Sensors Before Catalytic Converter, Checking|Page 5901
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Specified value: at least 11.0 V

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Switch ignition off.

If specified value is not obtained:

-

Check wire between 4-pin connector terminal 1 and Motronic  Engine Control Module (ECM) Power Supply Relay 2 (J670) for  open circuit
according to wiring diagram.

Wire resistance: max. 1.5 ohms

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Erase DTC memory of Engine Control Module (ECM) , Diagnostic mode  4: Reset/erase diagnostic data.

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Generate readiness code.

If specified value is obtained:

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Check Ground (GND) activation of the respective oxygen sensor heater.

Checking Ground (GND) activation of oxygen sensor heating 

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Connect test box to control module wiring  harness, connect test box 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

Oxygen Sensor Heater For Oxygen Sensors Before Catalytic Converter, Checking|Page 5903 > < Oxygen Sensor Heater For Oxygen Sensors Before Catalytic Converter, Checking|Page 5901