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 OUTPUTSFUEL PUMP RELAY CONTROL
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Fuel Pump Relay Control
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Fuel Pump Relay Control
Control of the fuel pump relay is an output function of the ECM. The main relay provides operating power for the fuel pump relay. After the initial ignition ON input, the ECM provides a ground for the fuel pump control circuit. The circuit is maintained with the presence of the engine speed signal. The fuel pump relay supplies operating power to the in-tank mounted fuel pump.
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.