Transmission Control Systems: Description and Operation

System G100, G101, G102, G110

Introduction

Tiptronic

NOTE: The version of the Tiptronic system ('diagnosis software number') can be read out with the 9588 Porsche System Tester II in menu item 'Identification'.

System G100, G101, G102, G110

Valid for:
- 911 Turbo (996) as of model year 2001
- 911 Carrera (996) as of model year 2002

NOTE:
- The information on this Tiptronic system is valid for all the above systems.
- Differences in the individual systems will be pointed out at the appropriate places.

Communication between control unit and 9588 Porsche System Tester II

NOTE:
The following conditions must be met in order to establish communication between the vehicle electrical system control unit and the 9588 Porsche System Tester II:
- 9588 Porsche System Tester II connected to data link connector
- Ignition on
- Wheel speed is less than 10 km/h
- The battery voltage must be greater than 6.7 V

General information on the fault memory
- The fault memory of the control unit can save up to five different faults simultaneously.
- If all five fault memory locations are occupied, the new fault overwrites the oldest fault.
- The contents of the fault memory are retained even when the unit is removed.
- Faults in the control unit can be deleted only after an ignition OFF/ON reset.

General information on the fault memory
The faults can be divided into four groups:

Group 1:
Faults are automatically reset if they are no longer currently present:
Fault No. 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41.

Group 2:
Faults are reset at ignition OFF/ON:
Fault No. 7, 8, 15, 41, 50, 54.

Group 3:
Faults are reset at ignition OFF/ON depending on an EEPROM background counter (fault correction counter) (conditional reset after ignition OFF/ON):
Fault No. 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 17, 55.

Group 4:
Faults are not reset and can only be deleted by means of the 9588 Porsche System Tester II:
Fault No. 53, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65.

Environmental data
Besides the fault memory, environment data are also stored. Specifically, these are:
- Time after ignition ON when fault occurred (max. 5.1 sec)
- Supply voltage when fault occurred
- Gear information when fault occurred

Diagnostic conditions
The fault can only be identified if the requirements listed under diagnostic conditions are met. For this reason, the specified procedure must be observed after a fault is repaired:
1. Clear fault memory.
2. Satisfy the requirements listed under 'Diagnostic conditions'.
3. Read out fault memory again.

Possible causes of fault
The possible fault causes that may be responsible for the fault are listed here. Please note that in certain circumstances further faults can be stored in the fault memory after troubleshooting (e.g. if plugs are disconnected). After carrying out repairs, read out the fault memory of all control units and delete any faults.

Diagnosis/troubleshooting
- The errors entered are indicated using the Porsche fault code as clear text.
- The fault memory Info key F[8] on the 9588 Porsche System Tester II can be used to access the extended fault memory. This information should be saved using the key F[4] and printed out. The following information can be displayed:

OBD code
The OBD fault code 'Pxxxx' (if present) is only displayed in the extended fault memory at the end.

Fault type
The following fault types are possible:
- - (No details available)
- Short circuit to B+
- Short circuit to ground
- Signal implausible
- No signal change
- Open circuit/short circuit to B+
- Open circuit/short circuit to ground
- Open circuit
- Below limit value
- Above limit value

Occurrence of faults
Faults occur as follows:
- statically (i.e. once)
- sporadically (i.e. more than once)

Fault status
The following status types are possible:
- present (at the time of the last diagnosis routine)
- not present (at the time of the last diagnosis routine)