91-11Fault code 5 · Control unit supply voltage < 9 V or 16.5 V

911 Turbo (996) ParkAssist P02 91 91-11Fault code 5 Control unit supply voltage < 9 V or 16.5 V Diagnostic conditions • Ignition on • Reverse gear engaged • Continuous fault tone emitted after engaging reverse gear Possible cause of fault ♦Low vehicle voltage ♦Fault in generator Affected terminals Terminals II/10 and II/18 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check supply voltage of ♦Select Control unit supply volt- Approx. 12 V control module age in the Actual values menu → End Step 2 item. ♦Start the engine. ♦Engage reverse gear. 2 Check the generator ♦Start the engine. > 9 V and < 14.5 V < 9 V or > 12 V: Step 3 repair generator. ♦Measure voltage between both → End battery terminals. 3 Check input voltage of the ♦Switch off ignition. Approx. 12 V Repair wiring har- control module Step 4 ness. ♦Pull plug II off the control module → End for ParkAssist. ♦Switch on ignition. ♦Measure voltage between plug II pin 18 of the control module for ParkAssist and ground. ♦Measure voltage at plug II pin 18 and pin 10. 4 ♦Replace control module for ParkAssist → End 9101 Fault code 5 91-11 page 1 Printed in Germany – 42, 2003 5xxxxp02