1988 BMW 535is AutomaticFACTORY OEM SERVICE PROCEDURE

Test 7: Engine Speed Sensor & Reference Point Pick-Up

  1. Check sensor and pick-up general condition. Ensure that they are installed improper position and firmly seated. Electrical contacts must be clean and tight. Check that sensor plugs are not reversed. Plugs are color coded for identification.
  2. Install BMW Test Meter (22 13 100 ). Connect terminals and check for engine speed input signal to MCU. Connect check for reference signal to MCU. IF signals are not correct, remove terminal connections and recheck signals. If either signal is absent, check wiring for open. If wiring is okay, replace sensor and/or pick-up as needed. See SPEED SENSOR RESISTANCE  table.
SPEED SENSOR RESISTANCE

Application Ohms
All Except 735i 864-1056
735i 486-594
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:

  • • 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.

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