45 PSM 5.7 911 Turbo (996) · Work instruction

45 PSM 5.7 911 Turbo (996) Work instruction Display OK If not OK 5 Checking leads of speed ♦Ignition off. < 0.3 V Short circuit to B+ sensor for short circuit ♦Pull plug off the PSM control Step 6 between PSM con- to B+ trol unit plug pin 12 unit. or pin 28 and ♦Ignition on. speed sensor pin 4 ♦Measure voltage between PSM or pin 5. control module plug pin 12 and Repair wiring har- ground. ness. → End ♦Measure voltage between PSM control module plug pin 28 and ground. 6 Checking leads of speed ♦Ignition off. ∞ Ω Short circuit to sensor for short circuit ♦Measure resistance between Step 7 ground between to ground PSM control unit PSM control module plug pin plug pin 12 or pin 12 and ground. 28 and speed sen- ♦Measure resistance between sor pin 4 or pin 5. PSM control module plug pin Repair wiring har- 28 and ground. ness. → End 7 Checking leads of speed ♦Ignition off. 0 Ω Open circuit in sensor for open circuit ♦Measure resistance between Step 8 leads of speed sen- sor. PSM control unit plug pin 12 Repair wiring har- and pin 4 on speed sensor. ness. ♦Measure resistance between → End PSM control unit plug pin 28 and pin 5 on speed sensor. 8 Checking leads of speed ♦Ignition off. ∞ Ω Short circuit in sensor for short circuit ♦Measure resistance between Step 10 leads of speed sen- with respect to each sor with respect to PSM control unit plug pin 12 other each other. and pin 28. Repair wiring har- ness. → End 9 ♦Replacing front left speed sensor → End 10 ♦Replacing PSM control unit → End 45-9 page 2 4503 Fault code 4205 4205ps05 Printed in Germany – 29, 2002