DME 7.8 DME 7.8 0 · Oxygen sensors ahead of and after catalytic converte

DME 7.8 DME 7.8 0 Oxygen sensors ahead of and after catalytic converter 1 - Oxygen sensor ahead of catalytic converter 2 - Oxygen sensor after catalytic converter 1 2 5 Oxygen Sensor Heating Ahead of TWC, Bank 2 – Below Limit Diagnosis conditions • Battery voltage between 9.5 V and 16 V • Time elapsed after engine start-up greater than 10 seconds Possible fault cause ♦Short circuit to ground Affected terminals II/13 Diagnosis/Troubleshooting Note! Do not use contact spray on the connectors to oxygen sensor. Work instruction Display OK If not OK 1 Check oxygen sensor ♦Remove oxygen sensor connec- 3.0 to 3.5 Ω at 20 Replace oxygen heating tor Bank 2 ahead of catalytic °C sensor converter ♦Check resistance between pin 3 and 4 towards the oxygen sen- sor 2 ♦Check resistance between pin 4 ∞ Ω and the oxygen sensor housing 3 Check wiring ♦Check resistance between pin 4 ∞ Ω Repair wiring har- and vehicle ground towards ness DME control module 2469 P1119 0-109 page 5 Printed in Germany – 2, 2000 p1119