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 DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSSERVICE TESTER - REVISED AND EXPANDED SOFTWARECONTROL UNIT SURVEY
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Control Unit Survey
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Control Unit Survey
- The numbers of the individual control units have been reallocated
- From 1 - 9: Drive control units
- From 10 - 49: Body electronics
- As of 50: Running - gear control systems
- All other functions remain the same.
Attention! The highlighting of numbers means that only these numbers can be selected. Faults stored in the memory are displayed as before during the quick test by highlighting the entire text.
NEW: In addition, the asterisk is turned into an "F", so as to make it possible to display "Fault stored" on the printout.
RENDER: 1.0x
NO RELATED
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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.