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Monitoring Function

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When the engine is running, the pressure inside the brake booster is permanently calculated depending on ambient air pressure, intake air temperature, intake manifold pressure, engine load, engine speed and engine coolant temperature.

The difference between calculated and measured pressure in the brake booster is filtered with a low pass filter with a response time of 60 sec..

When the monitoring conditions are not met, the filter is stopped.

If the filtered deviation between calculated and measured pressure exceeds 200mbar, a brake booster vacuum sensor error is set.

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