Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 707
DME 7.8 DME 7.8 0 · Oxygen sensors ahead of and after catalytic converte
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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 –
Open Circuit
Diagnosis conditions
• Battery voltage between 9.5 V and 16 V
• Time elapsed after engine start-up greater than 10 seconds
Possible fault cause
♦Open circuit
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 connector for cor- ♦Visual inspection
rosion
2 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
2469 P1119 0-109 page 3
Printed in Germany – 2, 2000 p1119
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