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Home >> BMW >> 1990 >> 525i Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> MOTRONIC Control Unit (MCU) >> Notes
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MOTRONIC Control Unit (MCU): Notes

NOTE: Engine speed/reference point sensor supplies a signal to MCU to designate engine speed and reference. MCU uses this signal to control fuel pump relay ground. Ensure sensor is in proper operating condition.