If Tiptronic is off then the Up & Down buttons will select or deselect the overdrive gear. The Up
button will select overdrive while the Down button will select drive. If the LED Function Mode is
selected, the Green LED will be off when overdrive is active and on when overdrive is deselected.
If you cruise in traffic or town and are in drive and not yet fast enough to select overdrive, you may
force overdrive by pressing the Up button. If you are too slow or under load the TCU may shift
back to drive. Overdrive is always the highest gear.
If Tiptronic is on then the Up & Down buttons will shift gears up or down, if the shift criteria on the
gear profiles are met. If the LED Function Mode is selected, the Green LED will flash indicating
Tiptronic Mode.
The profile switch may be selected between Profile 1 & 2 while driving. This is useful to change
shift patterns in traffic or mountain driving. Profile 3 & 4 will only change to or from if the vehicle
stands still. This is useful for off-road especially in low range where different speed setting will
force the TCU to shift. It will also protect the driver if he accidently turned the button to far and
prevent the TCU from shifting to lower gears.
7.2 Operation without a Profile Switch.
If Tiptronic is off then the Up & Down buttons will select or deselect the overdrive gear. The Up
button will select overdrive while the Down button will select drive. If the LED Function Mode is
selected, the Green LED will be off when overdrive is active and on when overdrive is deselected.
If you cruise in traffic or town and are in drive and not yet fast enough to select overdrive, you may
force overdrive by pressing the Up button. If you are too slow or under load the TCU may shift
back to drive. Overdrive is normally the highest gear.
If Tiptronic is on then the Up & Down buttons will shift gears up or down, if the shift criteria on the
gear profiles are met. If the LED Function Mode is selected, the Green LED will flash indicating
Tiptronic Mode.
If the Down shift button is pressed for 4 seconds Profile 2 will be selected and if the Up shift button
is pressed for 4 seconds Profile 1 will be selected. The TCU will always start in Profile 1 when the
ignition is switched on.
These profiles can be selected during driving. Make sure that a profile change does not force the
ECU to shift gears while driving. For low range selection rather buy the profile switch to be safe.
7.3 Limp Mode.
All transmissions has limp mode capabilities so that the driver can ride for short distances to
where he can be safe and get mechanical help. There is a mechanical limp mode on the
transmission itself when you disconnect the TCU. In this mode you would be able to select certain
gears with the shifter. Unfortunately some transmissions will not shift to top gears and the driver
will have to limp home at a slow pace till he can reach help. In this mode the lockup clutch and line
pressure control will not operate. Line pressure will be at a maximum resulting in hard shifts.
The limp mode feature on the TCU allow the driver to put the TCU in a tiptronic shift mode that will
force the transmission to shift regardless of any sensor or signals present. This is a useful feature
in case of sensor failure where the TCU are still working. The user will be able to use all the gears
and also the lockup clutch. The line pressure will be at a maximum to protect the clutches. The
lockup will be engaged after the highest gear was selected. If you have a four speed transmission,
the lockup will be utilized as the fifth gear.
To activate limp mode, start the engine and put the shifter in reverse. Press the downshift button 5
times and limp mode will be activated. Now the gears can be selected up or down by the tiptronic
buttons. The two LED’s will indicate solenoid 1 and 2 status and help the user to memorize in
which gear he is.
To Next Page
Loading...