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 DESCRIPTIONSCATALYTIC CONVERTER PROTECTION FUNCTION (IGN. CIR. MONITORING)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Catalytic Converter Protection Function (IGN. CIR. Monitoring)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Catalytic Converter Protection Function (IGN. CIR. Monitoring)
OPERATION
Malfunctions on the primary side of the ignition system are detected by the Digital Motor Electronic (DME) control unit and result in the injector valve on the relevant cylinder being switched off. This prevents an impermissible accumulation of uncombusted gasses in the catalytic converter.
In addition to monitoring the primary circuit, the system monitors the integrity of the secondary ignition circuits.
The ignition circuit monitoring function detects misfiring on a cylinder-selective basis and discontinues injection to the affected cylinder. Ignition spark output is communicated to the engine control module via a 240 ohm shunt connected to the common ground lead of the coils.
Malfunctions on the primary side of the ignition system are detected by the Digital Motor Electronic (DME) control unit and result in the injector valve on the relevant cylinder being switched off. This prevents an impermissible accumulation of uncombusted gasses in the catalytic converter.
In addition to monitoring the primary circuit, the system monitors the integrity of the secondary ignition circuits.
The ignition circuit monitoring function detects misfiring on a cylinder-selective basis and discontinues injection to the affected cylinder. Ignition spark output is communicated to the engine control module via a 240 ohm shunt connected to the common ground lead of the coils.
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.