Diagnosis/troubleshooting for vehicles with Tiptronic transmission

NOTE: Before troubleshooting, read out the fault memory of the DME, Tiptronic and the instrument cluster and, if necessary, remedy faults!

DIAGNOSIS TROUBLESHOOTING - FAULT CODE 5520, AS OF MY 2002 (TIPTRONIC TRANSMISSION)

Work instruction			Display OK	If not OK
1	Visual inspection	Visual inspection of all plug contacts and leads	Step 2	Repair wiring harness -> End
2	Check control units	Ignition off Disconnect plug from DME control module D and instrument cluster A Ignition on Erase fault memory Update and read out fault memory	No display Fault code 5520 Step 6	Display Fault code 5520 present Step 3
3	Check CAN drive between ABS control unit, DME control module and instrument cluster for short circuit to B+	Ignition off Pull plug off the ABS control unit Ignition on Measure voltage between ABS control unit plug pin 24 and ground Measure voltage between ABS control unit plug pin 40 and ground	< 0.3 V Step 4	Short circuit to B+ Repair CAN wiring harness -> End
4	Check CAN drive between ABS control unit, DME control module and instrument cluster for short circuit to ground	Ignition off Measure resistance between ABS control unit plug pin 24 and ground Measure resistance between ABS control unit plug pin 40 and ground	Step 5	Short circuit to ground Repair CAN wiring harness -> End
5	Check CAN drive between ABS control unit, instrument cluster and DME control module for short circuit with respect to each other	Ignition off Measure resistance between PSM control unit plug pin 24 and pin 40	Step 15 Short circuit with respect to each other	Repair CAN wiring harness -> End
6	Check CAN drive between ABS control unit and DME control module for open circuit or incorrect allocation	Ignition off Measure resistance between ABS control unit plug pin 24 and DME control module plug D pin 36 (CAN drive high) Measure resistance between ABS control unit plug pin 40 and DME control module plug D pin 37 (CAN drive low)	< 5 Step 7	Repair open circuit in CAN wiring harness -> End
7	Check CAN drive between ABS control unit and instrument cluster for open circuit or incorrect allocation	Ignition off Measure resistance between ABS control unit plug pin 24 and instrument cluster plug A pin 15 (CAN drive high) Measure resistance between ABS control unit plug pin 40 and instrument cluster plug A pin 31 (CAN drive low)	< 5 Step 8	Repair open circuit in CAN wiring harness -> End
8	Check DME control module	Ignition off Connect plug to ABS control unit Connect plug D to DME control module Ignition on Erase fault memory Update and read out fault memory	No display Fault code 5520 Step 9	Display Fault code 5520 present Step 11 and also continue test at Step 9
9	Check instrument cluster	Ignition off Connect plug to ABS control unit Connect plug A to instrument cluster Disconnect plug D from DME control module Ignition on Erase fault memory Update and read out fault memory	No display Fault code 5520 Step 10	Display Fault code 5520 present Step 17 and also continue test at Step 10
10	Check DME control module	Ignition off Connect plug D to DME control module Disconnect plug B from DME control module Ignition on Erase fault memory Update and read out fault memory	No display Fault code 5520 Step 11	Display Fault code 5520 present Step 18 and also continue test at Step 11
11	Check Tiptronic control unit	Ignition off Connect plug B to DME control module Ignition on Erase fault memory Update and read out fault memory	No display Fault code 5520 -> End	Display Fault code 5520 present Step 12
12	Check CAN bus between DME control module and Tiptronic control unit for short circuit to B+	Ignition off Disconnect plug B from DME control module Pull plug off the Tiptronic control unit Ignition on Measure voltage between Tiptronic control unit pin 85 and ground Measure voltage between Tiptronic control unit pin 86 and ground	< 0.3 V Step 13	Short circuit to B+ Repair CAN wiring harness -> End
13	Check CAN bus between DME control module and Tiptronic control unit for short circuit to ground	Ignition off Measure resistance between Tiptronic control unit plug pin 85 and ground Measure resistance between Tiptronic control unit pin 86 and ground	Step 14	Short circuit to ground Repair CAN wiring harness -> End
14	Check CAN drive between Tiptronic control unit and DME control module for short circuit with respect to each other	Ignition off Measure resistance between Tiptronic control unit pin 85 and pin 86	Step 15	Short circuit with respect to each other Repair CAN wiring harness -> End
15	Check CAN bus between DME control module and Tiptronic control unit for open circuit	Ignition off Measure resistance between Tiptronic control unit pin 85 and DME control module plug B pin 3 Measure resistance between Tiptronic control unit pin 86 and DME control module plug B pin 4	< 5 Step 19	Repair open circuit in CAN wiring harness -> End
16	Replace ABS control unit		-> End
17	Replace instrument cluster		-> End
18	Replace DME control module		-> End
19	Replace Tiptronic control unit		-> End