1992 BMW 535i AutomaticFACTORY OEM SERVICE PROCEDURE

Fuel Pump Relay

Remove fuel pump relay. Apply battery voltage to relay terminal No. 30 and terminal No. 86. See Fig 1 . Ground relay terminal No. 85. Voltage should now exist at relay terminal No. 87. Replace relay if it does not work as indicated.

NOTE: If relay does not work on vehicle, check battery feed, DME master (main) relay, DME/Motronic control unit and ground circuits going to fuel pump relay. See WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Only sockets No. 2, 4, 6 and 8 are used by relay.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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