Test 7: Engine Speed Sensor & Reference Point Pick-Up
- 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 pick-up as needed.