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 MANUALSBMW1996850CI (E31) V12-5379CC 5.4L SOHC (M73)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONENGINE CONTROL SYSTEM INPUTSIGNITION TIMING MODIFICATION SIGNALS
1996 BMW 850Ci (E31) V12-5379cc 5.4L SOHC (M73)
Ignition Timing Modification Signals
1996 BMW 850Ci (E31) V12-5379cc 5.4L SOHC (M73)SECTION Ignition Timing Modification Signals
- Ignition Timing Modification Request
- Ignition Timing Map Shift
- Ignition Timing/Fuel Injection Cutout Request
The ECM receives various input signals from other control modules that will:
- Modify ignition timing (advance/retard)
- Select alternate ignition timing MAP
- Activate ignition/injection fadeout.
- Cancel ignition/injection.
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.