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Home >> BMW >> 2009 >> 528xi Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2259 (Self Diagnosis - Theory & Operation (N54)) >> 1.10 Engine Cooling System Monitoring >> 1.10.3 Engine off Timer (EOT) Monitoring >> 1.10.3.1 Monitoring function

1.10.3.1 Monitoring function

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The engine off time is calculated using a relative time counter obtained from the instrumentation via CAN message. The difference in value of the relative time counter at last engine stop and at current engine start is compared to the corresponding values of ECT. An error is detected when engine off time is adjudged too small after a relatively large drop in ECT, or, conversely, when engine off time is too large after a small drop in ECT.

Error Symptoms 

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