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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATIONFUNCTIONAL DESCRIPTIONFAULT DISPLAY
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Fault Display
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Fault Display
Fault Display
Activation of the fault display is switched by the control unit at Pin 33. Normally (engine running, no fault), the level is referred to ground. If there is a break or a short to positive on the corresponding wire, the error message (transmission) is output by the instrument cluster as of an engine speed greater than 500 rpm or the fault indicator lights.
Activation of the fault display is switched by the control unit at Pin 33. Normally (engine running, no fault), the level is referred to ground. If there is a break or a short to positive on the corresponding wire, the error message (transmission) is output by the instrument cluster as of an engine speed greater than 500 rpm or the fault indicator lights.
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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.