1.2 - General Information On Fault Memory

Fault code setting conditions
Fault codes can be set in several circumstances:
e.g.
- battery disconnected
- plug connections disconnected
- power failure etc.

In these circumstances, no fault is present in the system and the fault memory must be erased.


NOTE: The fault memory of the Tiptronic control module is maintained even in removed state. Up to 5 faults can be stored in the fault memory.

Fault memory Info key F8
In order to be able to assess the fault exactly, the fault memory Info key F8 must be pressed. This information should be saved using the Save key F4 and printed out.
If a fault code is stored with the status "not present", the fault counter must be checked. If the counter is < 40 and no other problems are present, delete the fault memory.

1. static/sporadic
static: the fault has occurred only once
sporadic: the fault was detected as corrected at least once.

2. present/not present
The fault is detected as present or not present.

3. */signal implausible / no signal change / open circuit or short to ground / short to B+
Internal faults in the control modules

Signal implausible:
The incoming signal to the control module deviates from the signal expected.

No signal change:
The incoming signal to the control module does not change.

Open circuit or short to ground:
There is (present) or was (not present) a short circuit to ground or an open circuit in the circuit to the control module terminal.

Open circuit or short to B+:
There is (present) or was (not present) a short circuit to voltage or an open circuit in the circuit to the control module terminal.

Short to ground:
There is (present) or was (not present) a short circuit to ground in the circuit to the control module terminal.

Short to B+:
There is (present) or was (not present) a short circuit to voltage in the circuit to the control module terminal.

4. Environmental conditions:
Current operating conditions under which faults were detected and stored.

5. Load: [%]
Engine load at the time of fault storage

6. Engine temperature: [°C]
Engine temperature at the time of fault storage

7. Speed: [rpm]
Engine speed at the time of fault storage

8. v-transmission: [km/h]
Transmission output speed (from the output shaft) at the time of fault storage

9. PSM speed: [km/h]
Speed signal from the PSM control module at the time of fault storage

10. Transverse acceleration: [g]
Transverse acceleration value from the PSM control module at the time of fault storage

11. Selected gear: [-]
The gear recognised by the Tiptronic control module at the time of fault storage

12. Transmission temperature: [°C]
Transmission temperature at the time of fault storage

13. Counter: [-]
Frequency or deletion counter: an individual counter runs for every fault detected. The first time a fault is detected, the counter is set to > 40. If the fault is detected as not present, the counter is set to < 40 and after every warm up cycle the counter is reduced by one (decremented).
If the counter has reached the value 0, the fault is deleted from the fault memory.

14. MIL on/off (only for USA vehicles)
MIL "light" switched on / switched of

15. OBD II code PXXXX
Fault code to SAE J 2012