Blower fan, auxiliary heater
| Blower fan, auxiliary heater |
The blower fan is PWM controlled in two speed positions by the control module and speed changes occur with "gradual" functions which results in smooth changes which in turn minimises emission peaks.
| Diagnosis |
When shorted to ground, diagnostic trouble code B0448 is generated.
In case of an open circuit or short circuit to B+, diagnostic trouble code B0452 is generated.
If the fan motor "EMK" ends up outside the permitted range, that is, if the fan is jammed, diagnostic trouble code B0449 is generated.
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