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 OPERATIONENGINE CONTROL SYSTEM OUTPUTSENGINE SPEED SIGNALS
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Engine Speed Signals
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Engine Speed Signals
Engine Speed TD: The "TD" signal is produced by the ECM as an output function. The TD signal is a processed signal that indicates engine speed (RPM) The signal is made available to other control units including the Instrument Cluster, EML, EGS etc.
The TD output is a square wave modulated signal. The frequency of the signal is directly proportional to RPM. The receiving control module detects RPM by the number of pulses.
Engine Speed TR: The "TR" signal is an additional variation of the engine speed signal. The TR signal is produced by the M70 & S38 M1.2 & M1.7 ECM systems as an additional output function. Like TD, TR is a processed signal that indicates engine speed (RPM).
The TR signal is a pulse wave signal (sine wave). The frequency of the signal directly proportional to RPM.
NOTE: On vehicles systems that use TR as an input, the signal is overlapped on the fuel pump relay control signal from the DME control module.
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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.