Porsche DME 7.8 — OBD II Diagnosis Manual / PAGE 1053
DME 7.8 DME 7.8 0 · 0-185P1546
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DME 7.8 DME 7.8 0
0-185P1546
171 Charge Pressure Control Valve Output Stage -
Above Limit
Diagnosis conditions
• Charge pressure control active
Possible fault cause
♦Charge pressure control valve (coil) short circuit
♦Short circuit to B+
Affected terminals
III/4
Diagnosis/Troubleshooting
Work instruction Display OK If not OK
1 Check charge pressure ♦Measure resistance at the 20 - 26 Ω at 20 °C.
control valve. charge pressure control valve.
2 Check wiring harness for ♦Connect special tool 9637 to 0 V. Repair wiring har-
short to B+. wiring harness (DME control ness.
module plug).
♦Remove connector of charge
pressure control valve.
♦Ignition on.
♦Measure voltage between spe-
cial tool 9637 pin III/4 and
ground.
2193 P1546 0-185 page 1
Printed in Germany – 3, 2001 p1546
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