Test Point 13 - Selector Lever Switch
TEST POINT 13 - Selector lever switch/transmission - Fault code 35Possible Causes, Elimination, Remarks
Tiptronic warning lamp comes on, transmission is in emergency mode.
Possible 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 with Position indicator in speedometer and Position indicator on Tester 9288
NOTE: 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 ECU control unit connector, with the ignition turned off
- Open up junction T 40
- Check ECU connector pin 26 for ground, using an ohmmeter
- If no ground is present, refer to wiring diagram distributing point 1 and GP V
3) Measure position switch according to table 1
Table 1:
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
- Connection cable adjusted correctly?
- Repair instruction: 'Adjust position switch"
- Open circuit, short to ground, short to positive?
4) Check position switch without connections
- Disconnect connector trom position switch
- Check switch for continuity (Table 2)
Table 2:
Table 2
Ohmmeter display:
- = no continuity
0 = continuity
- Fault? Replace position switch
- No fault: Check wirings from position switch to T 40, T 41