Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 687
DME 7.8 DME 7.8 0 · 0-105P1115
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DME 7.8 DME 7.8 0
0-105P1115
13 Oxygen Sensor Ahead of TWC, Bank 1 – Signal
Implausible
Diagnosis conditions
• Mass air flow above 32 kg/h
• No other oxygen sensor faults
• Battery voltage between 9.5 V and 16 V
Possible fault cause
♦Open circuit
♦Oxygen sensor heating faulty
♦DME control module
Affected terminals
II/19
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 ahead of catalytic converter °C sensor
Bank 1
♦Check resistance between pin 3
and 4 towards the oxygen sen-
sor
2469 P1115 0-105 page 1
Printed in Germany – 2, 2000 p1115
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