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 OPERATIONDIGITAL MOTOR ELECTRONIC (DME)FUNCTIONAL DESCRIPTIONSENGINE DRAG TORQUE CONTROL (MSR)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Engine Drag Torque Control (MSR)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Engine Drag Torque Control (MSR)
OPERATION
In the same way as Automatic Stability Control or Slip Control (ASC+T), Engine Drag Control (MSR) is integrated in the Anti-Lock Brake (ABS) control unit. The engine is influenced via Digital Engine Electronic (DME) and the Idle Valve (ZWD 5).
When the Slip Control Module detects excessive wheel slip due to engine braking (drag torque), it signals the DME which now opens the idle valve (ZWD5) slightly to reduce engine drag torque. Further engine drag torque reduction is also obtained by the DME control module advancing the ignition timing and canceling the deceleration fuel cut-off function.
In the same way as Automatic Stability Control or Slip Control (ASC+T), Engine Drag Control (MSR) is integrated in the Anti-Lock Brake (ABS) control unit. The engine is influenced via Digital Engine Electronic (DME) and the Idle Valve (ZWD 5).
When the Slip Control Module detects excessive wheel slip due to engine braking (drag torque), it signals the DME which now opens the idle valve (ZWD5) slightly to reduce engine drag torque. Further engine drag torque reduction is also obtained by the DME control module advancing the ignition timing and canceling the deceleration fuel cut-off function.
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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.