Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 683
DME 7.8 DME 7.8 0 · 0-104P1114
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DME 7.8 DME 7.8 0
0-104P1114
723 Heating LSU, Inertia Fuel Shutoff - Signal Implau-
sible
Diagnosis conditions
• Exhaust temperature above 250 °C
• Battery positive voltage greater than 9.5 V
• Time elapsed after start-up greater than 60 seconds
• No faults of the oxygen sensor
• Inertia fuel shutoff greater than 4 seconds
Possible fault cause
♦Open circuit
♦Oxygen sensor
♦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 Bank 1 ahead of catalytic °C sensor
converter
♦Check resistance between pin 3
and 4 towards the oxygen sen-
sor
2469 P1114 0-104 page 1
Printed in Germany – 2, 2000 p1114
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