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.
1985 BMW 635CSi AutomaticFACTORY OEM SERVICE PROCEDURE
Test 8: Engine Speed Sensor & Reference Point Pickup
- Check sensor and pickup general condition. Ensure that they are installed in the proper position and firmly seated. Electrical contacts must be clean and tight. Check that sensor plugs are not reversed. Plugs are color coded for identification.
- Install BMW test meter (22 13 100 ). Connect terminals 8 and 27 and check for speed signal. Connect terminals 25 and 26 and check for reference signal. If signals are not correct, repair wiring. Remove terminal connections and recheck signals. If either signal is absent, replace sensor and/or pickup as needed.
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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