45-44Fault code 5520 · CAN data bus (drive)

911 Turbo (996) PSM 05 45 45-44Fault code 5520 CAN data bus (drive) Diagnostic conditions • Ignition on Possible cause of fault ♦CAN bus fault. Overall communication disturbed Affected terminals Terminals 24, 40 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check CAN bus between ♦Switch off ignition < 0.3 V Short circuit to volt- DME control module and ⇒ Step 2 age in the CAN wir- ♦Pull off DME control module plug Tiptronic control module ing harness and Tiptronic control module for short circuit to voltage between Tiptronic plug control module plug ♦Switch on ignition pin L and DME con- ♦Measure voltage between Tip- trol module plug pin tronic control module plug pin L B3 and ground → End 2 Check CAN bus between ♦Measure voltage between Tip- < 0.3 V Short circuit to volt- DME control module and tronic control module plug pin H ⇒ Step 3 age in the CAN wir- Tiptronic control module and ground ing harness for short circuit to voltage between Tiptronic control module plug pin H and DME con- trol module plug pin B4 → End 3 Check CAN bus between ♦Switch off ignition ∞ Ω Short circuit to DME control module and ⇒ Step 4 ground in the CAN ♦Measure resistance between Tiptronic control module wiring harness Tiptronic control module plug for short circuit to ground between Tiptronic pin H and ground control module plug pin H and DME con- trol module plug pin B4 4503 Fault code 5520 45-44 page 1 Printed in Germany – 5, 2001 5520ps05