Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSECM - MOTRONIC CONTROL UNITS IDENTIFICATION
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
ECM - Motronic Control Units Identification
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION ECM - Motronic Control Units Identification
87BMW02
GROUP 12 Engine Electrical -
Bulletin Number 12 04 87 (1453) Page 1 of 2
Montvale, NJ August 1987 Technical Dept.
SUBJECT: M1.1 Motronic Control Units
MODELS: 325i, 325iC, 528E from 3/87, 735i (E32)
Situation: With the introduction of the Motronic M1.1, a new generation of control units is used in the following vehicle types: 325i, 325iC, 528E from 3/87, 735i (E32).
The basic control unit is acquired from the manufacturer as unprogrammed hardware. It is encoded by BMW with an individual variant control code (combination of digits and letters) for each version at a special programming station during car assembly.
Explanation: The basic control unit has two information labels (see sketch, items 1 and 2).
Label No. 1 bears the BOSCH number. Label No. 2 bears information for internal factory use. When the control data (software) is programmed into the basic control unit, the adhesive Label No. 3 with BMW logo is affixed to the control unit at the factory, indicating the variant control code (4-figure combination of digits and letters) and the VIN number. The adhesive label may be located either on the side or on top of the control unit.
Identification:
Original Equipment M1.1 Control Unit
Note: On replacement control units there are seven zeros in place of seven VIN digits on Label No. 3.
In case of doubt, you can always double-check if the variant control code and the BMW part number on the vehicle's control unit correspond with the actual parts microfiche. The microfiche usually lists the variant control code on the left side and the part number on the right.
GROUP 12 Engine Electrical -
Bulletin Number 12 04 87 (1453) Page 1 of 2
Montvale, NJ August 1987 Technical Dept.
SUBJECT: M1.1 Motronic Control Units
MODELS: 325i, 325iC, 528E from 3/87, 735i (E32)
Situation: With the introduction of the Motronic M1.1, a new generation of control units is used in the following vehicle types: 325i, 325iC, 528E from 3/87, 735i (E32).
The basic control unit is acquired from the manufacturer as unprogrammed hardware. It is encoded by BMW with an individual variant control code (combination of digits and letters) for each version at a special programming station during car assembly.
Explanation: The basic control unit has two information labels (see sketch, items 1 and 2).
Label No. 1 bears the BOSCH number. Label No. 2 bears information for internal factory use. When the control data (software) is programmed into the basic control unit, the adhesive Label No. 3 with BMW logo is affixed to the control unit at the factory, indicating the variant control code (4-figure combination of digits and letters) and the VIN number. The adhesive label may be located either on the side or on top of the control unit.
Identification:
Original Equipment M1.1 Control Unit
Note: On replacement control units there are seven zeros in place of seven VIN digits on Label No. 3.
In case of doubt, you can always double-check if the variant control code and the BMW part number on the vehicle's control unit correspond with the actual parts microfiche. The microfiche usually lists the variant control code on the left side and the part number on the right.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.