45-9Fault code 4205 · Speed sensor lead, front left

45 911 Turbo (996) PSM 5.7 45-9Fault code 4205 Speed sensor lead, front left Diagnostic conditions • Ignition on Possible cause of fault ♦Short circuit to B+ / ground or open circuit between control unit and speed sensor ♦Speed sensor faulty ♦Control unit faulty Affected pins Pin 12 and pin 28 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Visual inspection ♦Examine speed sensor and Step 2 ♦Repair speed lead at the front left for external sensor and damage. lead. ♦Check speed sensor plug for ♦Repair speed corrosion. sensor plug. → End 2 Checking speed sensors ♦Ignition off. 1 kΩ to 3 kΩ > 3 kΩ or < 1 kΩ ♦Disconnect plug from speed Step 3 Step 9 sensor. ♦Measure resistance between pin 1 and pin 2 on speed sen- sor. 3 Checking function of ♦Ignition off. Measureable AC volt- No AC voltage speed sensor ♦Set AC measuring range on the age, approx. same measureable. level as to speed Step 5 multimeter. sensor of an oppo- ♦Jack the vehicle up and turn the site wheel at same front left wheel by hand. wheel speed. ♦Measure voltage between pin 4 Step 5 and pin 5 of speed sensor. 4 Mechanical function ♦Check speed sensor and Step 9 Clean toothed ring toothed ring at the front left for and replace, if nec- soiling and damage. essary. → End 4503 Fault code 4205 45-9 page 1 Printed in Germany – 29, 2002 4205ps05