Possible causes of fault
NOTE:
The 'Diagnosis/troubleshooting' shown below is adapted to suit the fault type displayed in the tester (please note fault type numbering 1,2,... etc.!). The fault memory Info key [F8] on the Porsche System Tester II No. 9588 can be used to read out the fault type in the 'extended fault memory'.
- 1.) 'Short circuit to B+': A short circuit to B+ causes the shift solenoid valve C2 (modulation pressure) to be continually activated
- 2.) 'Open circuit/short circuit to ground': A short circuit to ground prevents activation of the shift solenoid valve C2 (modulation pressure)
- 2.) 'Open circuit/short circuit to ground': An open circuit prevents activation of the shift solenoid valve C2 (modulation pressure)
- 3.) 'Electrical fault in electric circuit': Shift solenoid valve C2 (modulation pressure) has no or limited function