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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

90 Lincoln Town Car, Display Failure
Q: Two years ago, the computer driven dash board display, in my '90 Lincoln Town Car, started to act up. It started with the outside temperature display which was okay for about 20 minutes and then suddenly would drop to 38 degrees below and stay there. I had a sensor replaced and drove the car for about 10 minutes and it did the same thing. I was told that the display needed to be replaced or it would go dark in about three months. It still has not gone dark, however, during this two-year period the "door ajar" warning lights up and stays on, also the "air bag" warning lights up and blinks. The average gas mileage, miles traveled and miles left have all become erratic. Last month the speedometer would stop working then drop-down, back up and then would wind up at 0. It would suddenly start working again into the same thing. The dash display for fuel and temperature are still working. When I fill the tank now it registers full on the gas gauge but the miles left to empty which use to register about 400 miles now registers erratically. Could it be a sensor or module?

A: It's possible that your digital dash may have to be replaced. You want to have some other items checked first. For example, the signal for the speedometer is created by a signal generator mounted in the transmission. It's not uncommon for these signal generators to fail, resulting in erratic m.p.h. reading. The computer also relies on the speedometer signal to calculate average gas mileage, miles traveled, etc.. Has anyone asked the air bag computer if there is a problem? The warning light is supposed to come on when there's a system problem. The digital dash relies on information from other components. Verify the quality of the information the digital dash is receiving before replacing it.

 
     
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