Tiptronic warning lamp comes on transmission is in emergency mode
Detectable faults: Open circuit/short to gound, short to positive
1) Check operation with Tester 9288 (drive link test)
- Acoustical test
Triggering cycle of valves is audible as a clicking noise near the transmission.
2) Pull connector off Tiptronic control unit.
a) Measure resistance between pin 42 and pin 19. Nominal value 34 Ohms, tolerance 10 %
b) Check that pins 42 and 19 are free from shorts to ground.
3) Also pull off connector at transmission.
- Check wiring (Tiptronic control unit connector pin 42 to transmission connector pin L and Tiptronic control unit connector pin 19 to transmission connector pin M).
- Wiring o.k.: Solenoid valve faulty Figs. 1, 8
Test point 17
Solenoid valve 4
Fault code 40
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