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 DESCRIPTIONSSELF-DIAGNOSIS
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Self-Diagnosis
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Self-Diagnosis
OPERATION
The task of the self-diagnosis feature is to detect and store malfunctions in Digital Motor Electronic (DME) components, the associated lines or in the memory of the control unit (ROM, RAM).
The DME control unit makes available substitute values in the event of sensor failure. These substitute values are cancelled once again as soon as normal operation can be resumed.
To facilitate fast and convenient troubleshooting, the stored defect codes or current values can be monitored from the DME control unit with the aid of a BMW DIAGNOSTIC SYSTEM or equivalent.
The task of the self-diagnosis feature is to detect and store malfunctions in Digital Motor Electronic (DME) components, the associated lines or in the memory of the control unit (ROM, RAM).
The DME control unit makes available substitute values in the event of sensor failure. These substitute values are cancelled once again as soon as normal operation can be resumed.
To facilitate fast and convenient troubleshooting, the stored defect codes or current values can be monitored from the DME control unit with the aid of a BMW DIAGNOSTIC SYSTEM or equivalent.
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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.