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the button only turns the system on
control of the cruise control is by a number of sensors and switches
brake sensor , clutch (if manual) VSS (if auto)
tacho, ECM, Speedo (road speed ) all of which have to word as any one not working will not allow the cruise control to work
run the fault codes and take it to an accredited service center for testing
It seems the pcm is detected a fault with the engine. Even if the problem goes away , the vehicle will have to go three drive cycles without engine faults before the cruise control use will be allowed by pcm.
run the fault codes
cruise control needs the following to work together as one or more will stop it from working.
VSS sensor, (road speed /speedo)
brake switch sensor/
clutch switch sensor
cruise control switch
The problem could be caused by several things. Did you check to see that you actually have vacuum at the cruise control servo? Or did you just "look" at the hoses?
Is the cable connected to the throttle body like it is supposed to be?
Have you scanned your PCM to see if there are any fault codes? Is the check engine light on? The PCM will not allow cruise control engagement if there are any fault codes present - including some codes that are not related to the cruise control system itself.
The speedometer is electronic and controlled by a micro processor, the needle is operated by a special DC electric motor called a "stepper" motor, this little motor can cause this problem as well as the Vehicle speed sensor on the transmission (see photo below), either part can cause the problem, the cruise not working would lead me to believe the speed sensor is defective, but you should have a Check Engine light on and a fault code for the sensor, do you have either? Autozone and others do the fault code test for free, ask for an OBD2 fault test. Here is the picture of the sensor I mentioned.
Actually FIXING the cruise control is usually not very hard. The hard part is finding out what is WRONG with the cruise control. Cruise control problems are usually caused by a broken clockspring (or contact assembly) in the steering column or a faulty cruise control servo assembly. Of course, there are several other possible reasons for the cruise to malfunction, but these are the most common.
The first step would be to scan your Engine Control Module (ECM) for fault codes. Please note that cruise control faults will not normally cause the Check Engine light to illuminate, so it is NOT safe to assume there are no codes present just because the light is not on. If the Check Engine light IS on, then you need to scan your ECM anyway! If there is a problem with the servo assembly, there will most likely be a code set. Problems with the clockspring will not usually set a code. A good clue that this could possibly be the problem is an inoperative horn and/or the Airbag warning light being on. (A broken clockspring will also cause these things)
Do you have the Check Engine light on? If there is a fault code set, the cruise control will not work. You need to have the car checked for fault codes. Take it to Autozone or do it yourself if you have a code reader.