5000S Wagon L5-2309cc 2.3L SOHC (NF) (1988)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor System
(Fault code 2341)
Requirements:
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engine oil temperature: minimum 80°C (176°F)
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differential pressure regulator OK
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connect multimeter US 1119 to differential pressure regulator, using adaptor VW 1315 A/1
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run engine at idle
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disconnect oxygen sensor connector, (arrow) single connector with green wire
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connect green oxygen sensor wire to ground using jumper wire
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specification: after approximately 15 seconds, differential pressure regulator current must increase to approximately 10mA
If specification is NOT obtained
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check wiring between fuel injection control unit and oxygen sensor connector (using wiring diagram)
If NO break in wiring is found
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replace fuel injection control unit
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reconnect oxygen sensor green wire
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start engine
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raise engine speed briefly to 3,000 RPM (to warm oxygen sensor)
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specification: differential pressure regulator current must return to original mA value, then it must fluctuate
If specification is NOT obtained
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replace oxygen sensor