Description of On-Board Diagnostics

On-board diagnostics (OBD)

The AW 30-40 and AW 30-43 automatic transmissions are equipped with a control system with an integral diagnostic function based on the same principles as those used in several other electronic systems. The AW 30-40/AW 30-43 OBD system features five test modes to facilitate troubleshooting.

- Test mode 1 enables the DTCs stored in the TCM to be displayed.
- Test mode 2 enables the TCM input signals to be tested.
- Test mode 3 tests the output signals to the system control components. The components are operated in sequence.
- Test mode 4 activates the same components as in test mode 3, but only when a code specific to each component has been entered. The rate of transmission of the flashing codes can also be varied, a feature used when testing with the Volvo ST.
- Test mode 5 enables the signal values from certain sensors to be measured.





Connection of Volvo ST.

Switch off ignition.
Insert memory cassette in ST.
Connect ST test lead to DLC in car.
Switch on ignition.
Search for text 1 EL.GEARBOX: Press *

- Press *. Text AW3O-43/50-42 will be displayed.
- Press *. Use arrow key to select high/low speed.
- Press *.





Connection of DLC
(for manual display)

Insert DLC test lead in socket 1 on.
Switch on ignition.
Select test mode 1 using test button on DLC.

If DLC does not respond:

Check unit as per B7-B1O. Data Link Connector