Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 1098
DME 7.8 DME 7.80 · 274 Overrun Recirculating Air Valve Output Stage -
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DME 7.8 DME 7.80
274 Overrun Recirculating Air Valve Output Stage -
Below Limit
Diagnosis conditions
• Engine running
• Battery positive voltage greater than 7 V
Possible fault cause
♦Short to ground 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 ∞ Ω Repair wiring har-
short to ground. wiring harness (DME control ness.
module plug).
♦Remove plug connection of
overrun recirculating air valve.
♦Measure resistance between III/
16 and ground.
274 Overrun Recirculating Air Valve Output Stage -
Above Limit
Diagnosis conditions
• Engine running
• Battery voltage greater than 7 V
Possible fault cause
♦Short circuit to B+ triggering wire
Affected terminals
III/16
0-198 page 2 2138 P1657
p1657 Printed in Germany – 3, 2001
This is a source reference. Confirm exact model applicability in the original material.