S6 Wagon L5-2226cc 2.22L DOHC Turbo (AAN) (1995)
Heated Oxygen Sensor: Testing and Inspection
Checking HO2S Probe Heating Circuit
Heated Oxygen Sensor Connector
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Disconnect HO2S heater harness connector - 2.
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Location: connector bank on bulkhead.
2-Pin Connector
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Connect Digital Volt Ohm Multimeter (DVOM) between: terminals 1 and 2 of HO2S heater harness connector, using adapter cables from
connector test kit VW 1594.
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Start engine and let idle.
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Must be 12-14 volts.
If NOT:
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Check HO2S circuit breaker -S73- in auxiliary relay panel 2, right A-pillar.
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Check continuity (according to wiring diagram) between terminal 2 and HO2S circuit breaker -S73-.
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Must be 0.5 ohm maximum (if necessary, check terminal assignments).
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Check continuity between terminal 1 and engine Ground (GND).
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Must be 0.5 ohm maximum.
Central Electric Panel With Detail Of Relay Position 6
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Check continuity (according to wiring diagram) between HO2S circuit breaker -S73- and terminal 30 of fuel pump relay -J17- (relay location
6).
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Must be 0.5 ohm maximum.
If circuit is open:
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Perform necessary repairs.