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 16 and pin 19. Nominal value 34 Ohms, tolerance 10 %

b) Check that pins 16 and 19 are free from shorts to ground.

3) Also pull off connector at transmission.

- Check wiring (Tiptronic control unit connector pin 16 to transmission connector pin D and Tiptronic control unit connector pin 19 to transmission connector pin M).

- Wiring o.k.: Solenoid valve faulty Figs. 1, 8

Fault, fault code

Possible causes, elimination, remarks

Test point 18

Control unit faulty

Fault code 42

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

Replace control unit

Test point 19

Control unit faulty

Fault code 43

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

Replace control unit

Test point 20

Control unit faulty

Fault code 44

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

Replace control unit

Test point 21

Downshift fault

Fault code 45

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

Possible faults: Corrupted rpm signal, from output or engine or output/engine rpm relationship

Faulty transmission (clutch slips)

1) Check speed sensor, Test point 13

2) Check transmission

Test point 22

Rev. limiter

Fault code 46

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

Possible faults: Corrupted rpm signal, from output or engine or output/engine rpm relationship

Faulty transmission (clutch slips)

1) Check speed sensor, Test point 13

2) Check transmission

Fault, fault code Possible causes, elimination, remarks

Test point 23 Tiptronic warning lamp comes on, transmission is in emergency mode.

Gear sel. monitor Possible faults: Corrupted rpm signal, from output or engine or

Fault code 48 output/engine rpm relationship

Solenoid valves faulty.

Faulty transmission (clutch slips).

1) Check speed sensor, Test point 13.

2) Check solenoid valves, Test points 9, 10, 16 and 17.

3) Check transmission.

Test point 24 Manual program switch

Fault code 51

2) Pull connector off Tiptronic control unit.

Check connection from Tiptronic control unit connector pin 48 to selector lever switch pin 3 for short to ground

No manual program possible.

Detectable faults: Short to ground

1) Check operation with Tester 9288 (Input signals)

Test point 25 Tip-switch up/down shifting

Fault code 52

Check connection from Tiptronic control unit connector pin 10 to selector lever switch pin 2 (upshift) or connection from Tiptronic control unit connector pin 29 to selector lever switch pin 1 (downshift) for short to ground.

No manual program possible.

Detectable faults: Short to ground

1) Check operation with Tester 9288 (Input signals)

2) Pull connector off Tiptronic control unit.

Fault, fault code

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