996 Turbo diagnostic manual — Turbo applicability only / PAGE 92
45-21Fault code 4256 · Hydraulic power unit faulty
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911 Turbo (996) PSM 05 45
45-21Fault code 4256
Hydraulic power unit faulty
Diagnostic conditions
• Ignition switched on
• Rear left outlet valve voltage actual value is evaluated internally
and shows implausible value (valve circuit or driver output mal-
function)
Possible cause of fault
♦PSM hydraulic unit faulty
Affected terminals
-
Diagnosis/troubleshooting
Work instruction Display OK If not OK
1 Replace hydraulic unit → End
4503 Fault code 4256 45-21 page 1
Printed in Germany – 4, 2001 4256ps05
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