Automatic Transmission/Transaxle: Description and Operation

System G50, G51, G52, G40, G41, G42, G43

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'.

Valid for:

Vehicle type System
911 Carrera 2 MY 1998 to 1999 G50
911 Carrera 4 MY 1999 G51
911 Carrera 2 and 4 MY 2000 to 2001 G52
Boxster MY 1997 to 1999 G40
Boxster MY 2000 G41
Boxster MY 2001 to 2002 G42
Boxster as of MY 2003 G43

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.

Diagnostic setup
If the 9588 Porsche System Tester II cannot set up communication with the control unit, this may be due to the following faults:
- No voltage supply for the Tiptronic control unit. (pins 26, 54, 55, 28, 6, 34)
- K lead faulty. (pin 88)
- Present in the 'kickdown switch' input signal, is the information 'kickdown switch closed' (ground).

General information on the fault memory
- The control unit has two fault memories: one non-volatile (primary) and one volatile (secondary).
- The primary fault memory of the control unit can save up to five different faults simultaneously.
- If all five fault memory locations are occupied, no more new faults can be stored.
- The fault entries in the primary fault memory are also retained after disconnecting the control unit from the vehicle or disconnecting the starter battery.
- The secondary fault memory of the control unit can store all faults that occur.
- The fault entries in the secondary fault memory are lost after disconnecting the control unit from the vehicle or disconnecting the starter battery.
- Faults in both fault memories in the control unit can be deleted only after an ignition OFF/ON reset.

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 [F8] on the 9588 Porsche System Tester II can be used to access the extended fault memory. This information should be saved using the key [F4] 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)