Transverse Interlock

Fault code 2055

Voltage supply to transverse lock servo motor

Diagnostic conditions
- Ignition on
- Transverse lock control unit internal function test
- Engine running
- Selector lever position 'P'
- Engage transverse lock

Possible causes of fault
- 'Short circuit to B+': short circuit in wiring harness (servo motor runs continuously)
- 'Short circuit to B+': control unit faulty (servo motor runs continuously)
- 'Short circuit to ground': short circuit in wiring harness (servo motor does not function)
- 'Short circuit to ground': short in servo motor winding or short circuit in servo motor leads (servo motor does not function)
- 'Short circuit to ground': control unit faulty (servo motor does not function)
- 'Open circuit/short circuit to ground': open circuit/short circuit in wiring harness (servo motor does not function)
- 'Open circuit/short circuit to ground': open circuit/short in servo motor winding or short circuit in servo motor leads (servo motor does not function)
- 'Open circuit/short circuit to ground': control unit faulty (servo motor does not function)
- 'Electrical fault in electric circuit': open circuit/short circuit in servo motor or in leads (servo motor does not function)
- 'Electrical fault in electric circuit': control unit faulty (servo motor does not function)

Affected pins
Transverse lock control unit plug:
- Pin 15 'servo motor (A)', to pin A1 of 'servo motor plug A'
- Pin 16 'servo motor (B)', to pin A2 of 'servo motor plug B'

Diagnosis/troubleshooting

NOTE:
Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

NOTE:
Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Troubleshooting fault type: 'short circuit to B+'






Troubleshooting fault type: 'short circuit to ground'






Troubleshooting fault type: 'Open circuit/short circuit to ground'

Troubleshooting fault type: 'electrical fault in electric circuit'