Test Point 12 - Selector Lever Switch/Transmission

TEST POINT 12 - Selector lever switch transmission - Fault code 35

Possible Causes, Elimination, Remarks

Tiptronic warning lamp comes on, transmission is in emergency mode.

Detectable faults: Open circuit, short to ground, short to positive

1) Check operation with Tester 9288

Adjustment of Tester 9288:
Menu: "Input signals" = Selector lever/manual program

- Shift through selector lever positions P, R, N, D, 3, 2,1 one after another.
Compare:
Selector lever position
Position indicator in speedometer
Position indicator on Tester 9288

CAUTION: Due to its design, the display on Tester 9288 appears with a certain delay shift through positions sufficiently slowly.

No match: Check wiring according to wiring diagram, check position switch with/without wiring

2) Disconnect Tiptronic control unit connector, with the ignition turned off.
- Check Tiptronic control unit connector pin 26 for ground, using an ohmmeter.
- If no ground is present, refer to wiring diagram distributing point 1 and GP IX.

Table 1:

3) Measure position switch according to table 1
Ohmmeter display:
- = no continuity
0 = continuity

- Measurements o.k. Control unit faulty
- Measurements present but wrong sequence?
- Check connection cable from selector lever switch to position switch
- Connect cable adjusted correctly?
- Repair instruction: "Adjust position switch"
- Open circuit, short to ground, short to positive?

Table 2:

4) Check position switch without connections
- Disconnect connector from position switch
- Check switch for continuity, table 2

Ohmmeter display:
- = no continuity
0 = continuity

Fault? Replace position switch
No fault? Check wirings from position switch to T 46, T 47