Scan Tool Testing and Procedures
Selector Mechanism, Checking
Overview
• 1. Selector mechanism function test.
• 2. Checking ignition key removal lock.
• 3. Checking lock button on selector lever handle.
1. Selector Mechanism Function Test
• In selector lever positions "S", "D", "R" and "Tiptronic gate" the starter motor will not operate.
• If selector lever position "N" is selected at speeds greater than 5 km/h, the selector lever lock solenoid must not engage and block the selector lever. Selector lever can be shifted into a driving gear.
• For speeds below 2 km/h (almost a standstill) and shifting into selector lever position "N", the shift lock solenoid must only engage after approximately 1 second. Selector lever can only be shifted out of position "N" with the brake pedal pressed.
Selector lever in the "P" position:
- Press the button for the parking brake to lock the electromechanical brake.
- To reach the "ignition on" position, press the key briefly in the ignition lock.
- Do not press the brake pedal.
• Selector lever is locked and cannot be shifted out of the "P" position while the lock button on the selector lever handle is pressed. Shift lock solenoid (N110) blocks selector lever.
- Press and hold brake pedal.
• Shift lock solenoid (N110) releases selector lever. Selecting a driving position is possible. With lock button on selector lever handle pressed, slowly shift selector lever from "P" through "R, N, D, S"; when doing so, check whether Transmission Range (TR) display (Y6) in instrument cluster corresponds with selector lever position.
Selector lever in "N" position and ignition switched on:
- Do not press brake pedal.
• After a brief pause: Selector lever is locked and cannot be shifted out of "N" position despite pressing lock button on selector lever handle. Shift lock solenoid (N110) blocks selector lever.
- Press brake pedal.
• Shift lock solenoid (N110) releases selector lever. Selection of position "D" is possible.
Selector lever in position "D", ignition switched on:
- Shift selector lever into "Tiptronic gate".
• Lit "D" symbol in selector lever Transmission Range (TR) position display (Y26) must go out and "+" and "-" symbols must light up.
• The transmission range display (Y6) in the instrument cluster should switch from "D" to "M1" when the selector lever is shifted into the "Tiptronic gate".
- Perform "Guided Fault Finding" if the specified values are not reached. Refer to
- Adjust selector lever cable. Refer to => [ Selector Lever Cable, Adjusting ] Adjustments.
- Check lock button on selector lever handle.
- Check ignition key removal lock.
2. Checking Ignition Key Withdrawal Lock
- Press the button for the parking brake to lock the electromechanical brake.
- Do not press brake pedal.
- To reach the "ignition on" position, press the key briefly in the ignition lock.
- Press brake pedal and hold.
• It must be possible to shift selector lever out of position "P" without "hitching" while lock button on selector lever handle is pressed.
- Switch ignition off.
• It should not be possible to remove the ignition key when the selector lever is in any other position than "P".
- Place selector lever in the "P" position.
- Remove ignition key.
• It must be possible to remove ignition key only in the "P" position.
• Selector lever cannot be shifted out of "P" position with button pressed and brake pedal pressed.
Perform "Guided Fault Finding" if the ignition key withdrawal lock does not function as described. Refer to
3. Checking Lock Button on Selector Lever Handle
Check lock button for ease of movement:
• It must be possible to press the lock button without using great force.
• After releasing, the lock button must come all the way back out by itself.
- Check the selector lever handle for correct installation if the specified values are not reached. Refer to => [ Selector Lever Handle ] Selector Lever Handle.
- Check if the selector rod or selector lever is bent.
Function test:
• The ignition is switched on.
The locking button on the selector lever handle must be pressed for the following shifts. If it is not pressed, the selector lever cannot be shifted into the specified position.
• "P" to "R" and also press brake pedal
• "D" to "S"
• "N" to "R"; in a standstill, also press brake pedal after long wait.
• "R" to "P"
- Check the selector lever handle for correct installation if the specified values are not reached. Refer to => [ Selector Lever Handle ] Selector Lever Handle.
- Perform "Guided Fault Finding"
- Adjust selector lever cable. Refer to => [ Selector Lever Cable, Adjusting ] Adjustments.