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Old 02-12-2013, 05:59 PM   #1
2001ffocuszx3
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Cruise Control problem & VSS question

My cruise control is not working. I can set it and the light would turn on but doesnt hold the speed. I can turn the light off with the brake and if i press resume the green light would turn back on but not gain any speed.
I fixed the wires in my hatch that were causing my third brake light not to work.
I did the Cruise control self test and i got 4 lights after pressing the on/acc.
4 lights=VSS. My speedometer still works and even compared the speed on the instrument cluster self test. Both are fine.

If a faulty VSS is causing my cruise control not to work, would it cost my speedometer not to work also?


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Old 02-12-2013, 07:51 PM   #2
2001ffocuszx3
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additional information. Car has 218,000 miles. Transmission was replaced 4000 miles before the cruise control stopped working. Had alternator problem over charging.
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Old 02-12-2013, 08:13 PM   #3
BC_ZX3
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Quote:
Originally Posted by 2001ffocuszx3 View Post
If a faulty VSS is causing my cruise control not to work, would it cost my speedometer not to work also?
Not necessarily. The Ford pinpoint diagnostic test accounts for this possibility by asking first, whether the speedo works normally and if not, checking the "VSS circuit" between the PCM and speed control actuator (the cruise control servo unit that physically pulls on the throttle cable). Ford refers to the circuit from VSS sensor on the diff to the PCM as a VSS circuit and also the circuit from the PCM to the speed control actuator as a VSS circuit.

So initially, I'd check the connector going to the speed control actuator/servo. Ensure there's no corrosion or bent pins, etc. and everything is visually sound.
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Old 02-12-2013, 10:46 PM   #4
Lscman
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For testing purposes only you could try jumpering VSS from your radio connector straight to the servo. You might also try disconnecting the radio in case it is somehow shorting the signal.
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