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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