2001 HONDA CRV CRUISE DOES NOT WORK AND CAR IDLES ROUGH?

2001 HONDA CRV CRUISE DOES NOT WORK AND CAR IDLES ROUGH?

Most cruise controls are controlled by a vacuum source and if the vacuum hose is leaking that will cause both of your problems. The cruise servo may be mounted under the hood or it may be located behind the inner fenderwell, between the fender and splash shield. The splash shield is the plastic liner you see if you take the front wheel off.It has plastic clips or screws holding it on.Find the cruise servo and see if a vacuum hose is attached. If so the hose may be leaking vacuum. If you spray carb cleaner in the area of the servo and its hose and the engine idles up or stalls while you're spraying the cleaner, you've hit the vacuum leak with it which causes the surging idle. If the vacuum hose is ok, the servo may be leaking vacuum instead. Its usually a bulky unit. The cable attached to the throttle that's not the throttle cable is probably connected to the servo so try following the cable from the throttle body seeing where it leads to

Cruise does not work and rough idle: The very short description is not helping very much at all. Are the brake lights lit up when you step on the pedal? (I'm checking part of the circuit here)
Have you checked the three related fuses of the system? Does the main switch light lit up? Any indication lit up on the dash? A better description of the problem and observation will help us to help you.
Is the horn working? Check the # 52 as indicating in the wiring diagram below. If the fuse has power and the horn is not working: The cable reel could be defected and cause the cruise inoperable.
Start by checking the three fuses in the under dash: Fuse # 14 and # 25 (Both 7.5A) and fuse # 52 (15A) in the under hood fuse/ relay box.
The rest of the system consist of a cruise control cable, the cruise control unit, the clutch pedal switch (If manual transmission) or by reading what I've copied from the service/repair DVD:
The cruise control system a vacuum-based system and is designed to work at speeds above 25 mph. To activate the system, the cruise control dash mounted main switch must be in the on position. The main switch toggles between on and off by simply pressing it. When in the on position, an indicator light in the switch will light.
The cruise control system works a mechanical linkage to the throttle by way of a vacuum motor which is inside a server. This is a diaphragm moved by vacuum applied to one side. A solenoid driven valve connects the vacuum motor to a vacuum tank. Another solenoid vents the vacuum. The cruise control module controls the servo and the throttle by pulsing these solenoid valves on and off.
One input to the cruise control module is the vehicle speed, which is sent to the Powertrain Control Module (PCM) by the Vehicle Speed Sensor (VSS)
To diagnose the system, first note the symptom.
If the system does not engage at all:
Check the main switch, make sure it is in the on position.
Check the brake and clutch (if installed) pedal adjustments.
Check the wiring for the cruise vacuum unit and control unit.
Check the vacuum hose connections for the vacuum unit.
Check the vacuum unit throttle cable and verify that it is connected.
Check the speedometer operation. If the speedometer does not work, the VSS may be faulty.
If the system loses speed:
Check the vacuum hoses for the vacuum unit for leaks.
Check the vacuum storage tank for leaks.
If the vehicle loses speed before the system engages:
Check the cable adjustment from the vacuum unit to the throttle for excessive free play.