45-25Fault code 4281 · Brake fluid level

911 Turbo (996) PSM 05 45 45-25Fault code 4281 Brake fluid level Diagnostic conditions • Status of the brake fluid level switch is evaluated and displays an implausible value • Short circuit to ground or open circuit in circuit to control mod- ule terminal 36 • The filtering time until the fault code is set is approx. 20 sec- onds Possible cause of fault ♦Brake fluid level too low ♦Wiring/ plug connection faulty ♦PSM hydraulic unit faulty Affected terminals Terminal 36 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Brake fluid ♦Check the brake fluid level OK Correct the fluid ⇒ Step 2 level → End 2 Check ground lead of the ♦Ignition off < 5 Ω Open circuit level switch ⇒ Step 3 between terminal 2 ♦Pull plug off brake fluid level of plug on brake switch fluid level switch and ♦Measure resistance between ter- ground point 3 minal 2 of plug on brake fluid → End level switch and ground 4503 Fault code 4281 45-25 page 1 Printed in Germany – 4, 2001 4281ps05