P0072

P007200

Diagnostic information - DME control unit

Ambient temperature sensor

The control unit must be active in order to test internal function sequences and diagnosable inputs/outputs.
In the event of a fault, check whether the fault is permanently >present<. To perform the check, erase the fault memory, meet the diagnostic conditions and read out the fault memory again.

NOTE:
- Comparison of all temperatures with engine that has completely cooled down Comparison
- Correctly code auxiliary heater Correctly
- No correct determination of outside air temperature No
- The displayed value on the instrument cluster does not correspond to the The actual outside temperature

Diagnostic conditions
- Comparison of all temperatures with engine that has completely cooled down with terminal 15 Comparison on and engine off.

Possible fault causes
- Ambient temperature sensor, implausible signal