All of these responses are surely possibilities but I believe the brake control switch is out of adjustment. A simple look up of how to adjust the position on the switch should solve this issue. It is also possible the switch is broken as everything these days seem to be made of plastic. - - Good luck!
SOURCE: Cruise Control
My Answer:
I've only seen Cruise Controls have 1 or possibly 2 wiring problems by design.
Usually the Cruise Control Servo Unit itself if pretty darn dependable, and will outlast most everything else on the SUV/car.
The most common problem is usually a BAD GROUND wire at the CC Servo
Unit itself, which is located under the hood and usually where it's
mounted off to the drivers side at or near the engine firewall, or else
up front nearest the battery box.
The other wiring problem might be a bad connector or dirty connection
point from where the wiring harness is run into and under the steering
column. That connector can be seen from under the dash area and checked
pretty easily with a DVM for proper function.
With either an automatic transmission or clutch driven model there is
one other "safety disengage switch" located on either the clutch pedal
or else the brake pedal, and this switch (if it's not positioned
properly, or defective - as in OPEN) will kill the +12-volt battery
POWER going to the CC Servo Unit itself. The CC light may be ON, but
there still won't be any battery power to the CC Servo Unit, causing it
not to set.
On all newer generation CC units the vehicle "angle" or attitude
sensor, and drive shaft VCO pickup sensor design were dropped, and
instead the monitored engine speed is now taken directly from the
engine's Black Box computer and used as the VCO reference. If this VCO
signal is missing then the CC Servo Unit will not engage as well.
If the CC Servo Unit
uses a vacuum line feed you'll need to check that as well to make sure
the hose is intact and it's making a good snug connection.
If all these points show to be good - then the CC Servo Unit itself is
bad and needs to be replaced. Make sure you troubleshoot everything
else above first as the CC Servo Unit is no doubt pretty pricey in cost, and may not be bad at all.
Hope this solves your problem.
Frank
SOURCE: cruise control will not stay engaged
When I try to engage the cruise control, the dash light flashes, but it doesn't stay on.
SOURCE: 2005 Sport Trac Cruise Control does not engage
If you can please look under the hood and find the Air filter, and follow that all the way to a round metal part (Throttle body) If you can see it there will be a coil,and on that coid will extrude a curved plate with a cable(throttle cable) attached to it running all the way back inward toward the back of the engine, and next to that there should be a second cable (crusie control cable). This cable is pulled on when you engage the cruise control, by a black box next to the fuse box.
If the Cruise control cable is near by try to reattach it and if it is damaged then have your dealership or some one mechanically inclinded to replace the tip ( if plastic) or replace the cable.
If that didnt help please get back to me
SOURCE: check engine light, cruis control light flashes,
I HAD THIS SAME PROBLEM BACK IN AUGUST. GO GET YOU TIMING CHECKED I DID NOT AND I BLEW MY ENGINE. SUBARU TOLD ME I "OIL STARVED" THE ENGINE AND DID NOT HONOR THE WARRANTY FROM WHAT I HAVE SEEN ON THE WEB THIS HAS HAPPENED ON MORE THEN ONE OCCASION. LONG STORY SHORT I GOT THE CHICKEN AND EGG STORY WHAT HAPPENED FIRST TIMING WHEEL BREAKING AND CLOGGING THE OIL OR OIL NOT RUNNING PROPER AND THE TIMING WHEEL BREAKING. NOW I HAVE A CAR SITTING IN MY DRIVEWAY WAITING FOR A TEN THOUSAND YES TEN THOUSAND DOLLAR ENGINE. AND THREE MORE YEARS OF PAYMENTS
SOURCE: 01 infinity QX4 code P1320 did tune up and changed
did you have the computer reset after the work????
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