Question about 2005 Lincoln Town Car

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Diogital speedometer and cruise control went out at same or about same time

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The cruise control and speedometer are controlled by a speed sensor located in the transmission. The speed sensor sends a signal to the ECM (engine control module) and the ECM sends the signal on to the speedometer in the instrument panel cluster.
If the ECM does not receive a signal from the transmission speed sensor, the cruise control and speedometer will not work.
Your mechanic will have to test and verify the speed sensor for correct function with a scan tool. If the "service engine light soon" lamp is illuminated, the ECM has identified the failure and will report a trouble code. Your mechanic will be able to read the code using the scan tool.
Good luck, let me know how it turns out.
regards,

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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How do i Reconnect the speedo cable on my 1978 GMC Truck with 350 motor, 4x4?


Depending on which end needs to be reattached, At the Speedometer Head or at the Transfer Case, or at the Cruise Control Module (if equipped with Cruise Control).

At the Transfer Case : Underneath the truck, on the left side of the transfer case, near the tail housing/rear of the transfer case (if it's a NP203 or NP205), there should be a small rectangular box threaded onto the transfer case, the other end (facing away from the transfer case) has a threaded end on it where you'll thread the end of the speedometer cable on.

At the Speedometer : Behind the instrument cluster, protruding from the back of the speedometer, is a round male port that the speedometer cable snaps onto. You just push it onto the back of the speedometer and it locks into place. Some cables have a metal end for the Speedometer end, some have a plastic end. The ones with the plastic end will sometimes break and won't stay locked in place at the speedometer.

If it's equipped with Cruise Control, you'll have 2 Speedometer Cables, an Upper Cable (From the Cruise Control Module to the Speedometer) and a Lower Cable (from the Transfer Case to the Cruise Control Module.) Both ends of the Lower Cable have Female Threaded ends (one to thread onto the box on the side of the transfer case, one to thread onto the Cruise Control). The Upper Cable has one threaded end and one Clip On/Press On end. Reconnecting the cable is the same as the methods I mentioned above, but with 2 additional threaded connections on to the Cruise Control Module (which is usually found on the Fenderwell in the engine compartment)

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U try to set cruise it dont come on also speedometer dont work


Fix the speedometer cable or VSS (vehicle speed sensor) circuit before diagnosing the cruise.

The cruise control is a separate system that uses speedometer information to adjust the throttle up or down depending on the speed detected.

Also, the actuator cable for the cruise control could be broken.

But, I would check the speedometer problem out first.

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