Limp-home mode 2
Fault caused by incorrect gear ratio or unusual shifting!
Explanation of table headings and content:
- Shift state before setting fault: States the selected position of the selector lever and the selected gear before the fault occurs and is set.
- Step 1: Vehicle in motion. After a fault occurs and is set, the Tiptronic control unit switches to limp-home mode. The gear engaged before the fault was set remains and the torque converter lockup clutch is not activated.
- Step 2: Motion interrupted, the vehicles is stationary, the gear engaged in 'step 1' is held. Shift solenoid valve C2 (modulation pressure) and shift solenoid valve B1 (modulation pressure) are 'ON'. All other shift solenoid valves are 'OFF'. Shift operation for 'gear 3' is prepared.
- Step 3: Shift operation for 'gear 3' terminates and the gear is held. Neutral-detect is started.
- Step 4: Shift operation for 'gear 5' is initiated. No 'neutral' state.
- Step 5 Shift operation for 'gear 5' terminates. No 'neutral' state and the shift solenoid valves are disabled.
SHIFT RESPONSE OF TRANSMISSION IN LIMP-HOME MODE 2
| Limp-home mode 2 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Shift state before fault set | Step 1 | Step 2 | Step 3 | Step 4 | Step 5 | ||||||
| Shift response | Torque limit [Nm] | Shift response | Torque limit [Nm] | Shift response | Torque limit [Nm] | Shift response | Torque limit [Nm] | Shift response | Torque limit [Nm] | ||
| R | R | state remains same | 100 | state remains same | 100 | state remains same | 100 | state remains same | 100 | 100 | |
| D | 1 | engage d gear held, no activation of torque converter lockup clutch |
150 | Shift solenoid valve C1/B1 'ON'; other shift solenoid valves 'OFF' engage d gear remains! |
150 | state remains held neutral detect |
150 | shifts to 'gear 5' | 150 | shift solenoid valves are disabled |
150 |
| D | 2 | ||||||||||
| D | 3 | ||||||||||
| D | 4 | ||||||||||
| D | 5 | ||||||||||
| D | 6 | ||||||||||
| 'R' control | enabled | enabled | enabled | enabled | disabled | ||||||
| Power switch (in Tiptronic control unit) | ON | ON | ON | ON | OFF | ||||||
Power switch (in Tiptronic control unit):
With the power switch (in Tiptronic control unit) 'ON', the Tiptronic control unit can control the transmission.
With the power switch (in Tiptronic control unit) 'OFF', the Tiptronic control unit cannot control the transmission.