LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> BMW >> 1989 >> 635CSi Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Basic Testing >> Fuel System >> MOTRONIC Control Unit (MCU) >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.