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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONENGINE CONTROL SYSTEM INPUTSASC INTERFACES
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
ASC Interfaces
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION ASC Interfaces
On vehicles equipped with ASC, the Engine Control Module is linked to the ASC control module through three signal lines for ASC regulation. The three signals are switched high/low input requests for power reduction/drag torque reduction. The signal paths follow the same logic as the Bosch engine management systems including:
- S-EML - Signal to the Engine Control Module of throttle regulation
- S-MSR (ZWV) - Signal request to the Engine Control Module for ignition timing retard and idle speed boost
- S-ASC (ZA) - Signal request to the Engine Control Module for fade out of ignition/injection and idle speed boost
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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.