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 MANUALSBMW2008M5 (E60) V10-5.0L (S85)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTDESCRIPTION AND OPERATIONMOTOR ELECTRONICS (DME MOTOR ELECTRONICS MSS65)MISFIRE DETECTIONION FLOWMEASUREMENT MSS65
2008 BMW M5 (E60) V10-5.0L (S85)
Ion Flowmeasurement MSS65
2008 BMW M5 (E60) V10-5.0L (S85)SECTION Ion Flowmeasurement MSS65
Ion Flow Measurement MSS65
The ionic current control units use the conductance of the mixture between the electrodes of the spark plugs to measure the following variables:
- Duration of spark combustion
- Combustion quality
Duration of spark combustion
The duration of spark combustion is measured after the ignition spark has been triggered. During ignition sparking, the conductance is very high, and this enables detection of the ignition spark. The unit is ms.
The duration of spark combustion varies in a value range of 0.1 to 1.5. If the ignition spark fails, the value falls to 0.1.
Combustion quality
The combustion quality is measured after the end of the ignition spark. To this end, the integral over the duration of combustion is formed. The unit is nSs (nano Siemens seconds; Siemens is the unit for conductance).
The combustion quality varies in a value range of 0-5. When no combustion is taking place, the value falls to 0.
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.