You'll need to have the plugs pulled for this test so you can turn the engine safelt and easily. You should get 1 pulse of 5 volts for every 2 rotations. Turn the key on, leave power wire connected and rotate the engine. You can check the rotation sensor by checking its output. You will single out a bad component in each step, eliminating each item as you go. The Playmates were as surprised as anyone by their hit. Your ten-dollar word for the day is 'Accelerando,' a musical method in which the tempo of a song speeds up throughout the song, which is demonstrated nicely here. If the alarm still does not stop, disconnect the solid blue, blue/white, white, and green wires, if this still does not silence the alarm, then the alarm module is bad. The humor of this song revolves around the ironic race between a Cadillac and a Rambler, with a stunner punchline. If this stops the alarm, then either the pump is not rotating, the rotation sensor is bad, or no spark on #4 or the alarm module is bad. If the alarm does not stop disconnect the green, white and blue/white wires. If this stops the alarm, check for no spark on #4 cylinder. If the alarm does not stop reconnect the green wire and unplug the white and blue/white wires to the rotation sensor. If this stops the alarm, either the rotation sensor is bad or the pump isn't rotating. Next I would disconnect the green wire going from the alarm module to the #4 coil wire terminal on the switchbox. If the alarm stops, either the oil level sensor is bad or the level is low. Once the alarm starts, I would first unplug the blue wire from the oil reservoir cap. Keep sleeves, watches and other objects that can catch on the flywheel away. Be careful- the flywheel is very close to your hand. Do these tests while the engine is running and the alarm is beeping. Run the engine to recreate the conditions sounding the alarm. First of all, run the engine on a remote tank of 50:1 just in case you DO have a failure. If you are having a problem with the alarm beeping at you on your Merc and you know it has oil in both tanks, here's a step-by-step to diagnose the problem.
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