Scan Tool Testing and Procedures

Control Module Function

System test
Special diagnosis routines can be run with this menu item.

The following conditions must be observed for the system test:
- Vehicle speed < 10 km /h
- Engine start detected and 10 seconds elapsed since engine start
- Terminal 15 supply voltage OK
- 5-volt supply voltage OK
- Engine temperature < 110 degrees C
- Outside temperature > 3 degree C
- Engine speed higher than idle speed

The following tests are performed:
- Display of all segments in the control module
- The servo motors are traversed across the entire range once
- The measured positioning travel is subjected to a plausibility test and stored as a fault if necessary
- Two different voltage values are set on the fresh-air blower and tested
- The A/C circuit is tested via the DME
- All fault paths are tested, and any faults are stored

After the system test, the air conditioning system regulator reverts to the state it was in before the test.

Replacing the air-conditioning system regulator and flashing display
If the air-conditioning system regulator is replaced, the display flashes after the ignition is turned on. In this case, the system test must be carried out first. The air-conditioning system regulator hereby learns the upper limit stops of the drive motor and the entire system is checked simultaneously.

Modify coding
Using this menu item the following functions can be coded: