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Pull the diagnostic codes and let me know what you find.
To pull fault codes manually: 1. Turn on ignition switch while holding the cruise switch SET position (down). 2. Within one second move the cruise switch (up) to the RESUME position. Cruise lamp will flash long and short lamp flashes. Constant short flashes indicate that no codes are stored. Long and short flashes are the codes.
Ok, I'm going to opt out of this question and leave it open to other experts. Dont reply otherwise I"ll be locked into the question, someone will respond automatically. Thanks
Hello My name is Mike,
I have seen a similar problem while working at the local Mitsubishi Dealer. The most common cause I have found for the cruise to not set is the brake[auto trans] or the clutch [manual trans] cut off switch. These switches can become out of adjustment or the bracket that the switch is mounted in bends slightly causing the switch to stay in the closed position and prevent the cruise from setting. When the switch is aligned and adjusted properly the cruise will work properly until either the clutch/brake pedal is pressed to disengage the cruise control.
It sounds like the servo is working and you have no codes, so this seems to be the most likely fix.
Sorry I had a loss of online connection. The switches are located where the pedals are mounted under the dash. Follow the pedal up from the bottom of it and you will find the switch mounted on a bracket as previously stated. Check to make sure the switch is mounted properly and that the switch is not closed. If it is in the closed position then it is easy to adjusted by a ratcheting adjustment to an open position but so when the pedal is depressed it will disengage the cruise.
I would have to think if the switches are adjusted properly and the cruise servo is working and you have power to the orange wire on the cruise vacuum pump and the vehicle has no vacuum leaks and then the control module would be my diagnosis.
Note: I assume you have not changed the intake or modified the intake from the factory set-up.
There should be power to the orange wire with the key on and the cruise is turned on.
I don't have a manual here at home, but if you have power to the orange wire then the control module is the next step.