Oxygen Sensor System

(Fault code 2341)

Requirements:
^ engine oil temperature: minimum 80°C (176°F)
^ differential pressure regulator OK





- connect multimeter US 1119 to differential pressure regulator, using adaptor VW 1315 A/1
- run engine at idle





- disconnect oxygen sensor connector, (arrow) single connector with green wire
- connect green oxygen sensor wire to ground using jumper wire
^ specification: after approximately 15 seconds, differential pressure regulator current must increase to approximately 10mA

If specification is NOT obtained
- check wiring between fuel injection control unit and oxygen sensor connector (using wiring diagram)

If NO break in wiring is found
- replace fuel injection control unit
- reconnect oxygen sensor green wire
- start engine
- raise engine speed briefly to 3,000 RPM (to warm oxygen sensor)
^ specification: differential pressure regulator current must return to original mA value, then it must fluctuate

If specification is NOT obtained
- replace oxygen sensor