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Thread: 1994 Mercury Grand Marquis GS

  1. #1

    Default 1994 Mercury Grand Marquis GS

    Just bought this automobile and am repairing it for my son. I am having some electrical problems. Also the odometer and trip odometer do not work, can you tell me how to solve this problem.

  2. #2
    Join Date
    Jan 2007


    Since the speedometer and trip odometer aren't working, check to see if a vehicle speed sensor trouble code has been set in the PCM. Chapter 6 of your Haynes manual will show you how. it also contains wiring diagrams at the back of the book to help you troubleshoot electrical problems. It really isn't possible to tell you how to solve the problems, since diagnosis is a hands-on ordeal.

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