45-23Fault code 4266 · Return pump fault

911 Turbo (996) PSM 05 45 45-23Fault code 4266 Return pump fault Diagnostic conditions • Return pump voltage and motor relay voltage actual values are evaluated and display implausible values • Open circuit in circuit to control module terminal 1 Possible cause of fault ♦Return pump motor locked up/runs too easily ♦Wire/ plug connection faulty ♦PSM hydraulic unit faulty Affected terminals Terminal 1 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check ground lead of the ♦Switch off ignition < 5 Ω Open circuit return pump ⇒ Step 2 between PSM con- ♦Pull off the PSM control module trol module plug ter- plug minal 1 and ground ♦Measure resistance between point of PSM PSM control module plug pin 1 Repair wiring har- and ground ness → End 2 Hydraulic unit defective → End 4503 Fault code 4266 45-23 page 1 Printed in Germany – 4, 2001 4266ps05