Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 703
DME 7.8 DME 7.8 0 · 0-108P1118
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DME 7.8 DME 7.8 0
0-108P1118
4 Oxygen Sensor Heating After TWC, Bank 2 – Signal
Implausible
Diagnosis conditions
• Exhaust temperature between 300 °C and 600 °C
• Battery voltage between 9.5 V and 16 V
Possible fault cause
♦Corrosion in connector
♦Oxygen sensor
Affected terminals
II/1
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- 9 to 10 Ω at 20 °C Replace oxygen
heating tor after catalytic converter sensor
Bank 2
♦Check resistance between pin 1
and 2 towards the oxygen sen-
sor
3 Check oxygen sensor ♦Check resistance between pin 1 ∞ Ω
and the oxygen sensor housing
♦Check resistance between pin 1
and 3
Note!
Do not exchange oxygen sensors ahead of catalytic converter and
after catalytic converter.
2473 P1118 0-108 page 1
Printed in Germany – 2, 2000 p1118
This is a source reference. Confirm exact model applicability in the original material.