Question about 1993 Volvo 940
The speed sensor should be in the rear differential. It should have a two wire connector going into a sensor on the back of the case cover. The wire is known to break from time to time right at the connector. Sometimes the wire breaks inside the insulation. Gently tug on the wire it it's broken inside it will completely break when you tug on it.
If the wire isn't broken use an ohm meter hooked up across the two sensor connectors. While watching the meter (with the car in neutral with the rear tires off the ground and the front wheels chalked in place. Also make sure the car is supported on jack stands) turn the drive shaft, if the sensor is working the ohm meter will start to fluctuate. If there is no reading the sensor is bad. This is not common, but it happens.
If the reading is normal and the wire is not broken the you will have to check it at the instrument cluster, but I don't know what wires to check at the cluster, you will need to get a shop manual or wiring diagram.
If I remember right that cluster has a "U" shaped pins in the connector that attach to the wiring plate. Use a pair of pliers and close the "U" shape down a little. They are known to expand over time and cause a loss of contact.
I hope this helps
Posted on Feb 25, 2009
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