Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 1101
DME 7.8 DME 7.8 0 · 0-198.1P1658
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DME 7.8 DME 7.8 0
0-198.1P1658
Overrun Recirculating Air Valve Output Stage - Above
Limit
Diagnosis conditions
• Engine running
• Battery positive voltage greater than 7 V
Possible fault cause
♦Short circuit to B+ triggering wire
Affected terminals
III/16
Diagnosis/Troubleshooting
Note!
The wiring for the overrun recirculating air valve is routed via the connector X 59/3 pin 8.
Work instruction Display OK If not OK
1 Check triggering wire for ♦Connect special tool 9637 to 0 V. Repair wiring har-
short circuit to B+. wiring harness (DME control ness.
module plug).
♦Remove plug connection of
overrun recirculating air valve.
♦Switch on the ignition.
♦Measure voltage between III/16
and ground.
2138 P1658 0-198.1 page 1
Printed in Germany – 6, 2002 p1658
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