Cruise Control May use intake manifold vacuum to pull open the throttle.
May use electric motor to open throttle.
Computer controlled
Needs driver input, vehicle speed input, and safety release features. Solenoids will add or remove engine vacuum to the throttle servo Driver InputVehicle Speed Input
Computer Control Safety Release Cruise Control
Looks at vehicle speed
Requires input from driver Set Resume Coast Cruise Control
Will be designed to release throttle if there is any malfunction ANY loss of power will release Vacuum Port Open all servo vacuum when OFF and turn OFF the Cruise Control
Computer grounds one solenoid to increase or decrease vehicle speed Vacuum Ports Closed when Off
Computer grounds one solenoid to increase or decrease vehicle speed Diagnose Cruise Control
Check input from brake/clutch switch (very common fault on older cars)
Ensure good vacuum to control servo Check input from cruise control switch Check input from vehicle speed sensor Check voltage at cruise control servo Cruise Control Switch
Where is the cruise control switch located?
Steering Column
What is dangerous about removing the Horn Pad? Air Bags
Before you remove the steering wheel you must disarm the air bag…. ….or you might get a very flat nose …. …………….or worse……...
Supplemental Restraint System
Must be disabled prior to removing the air bag module
Designed to fire after loss of battery power
DO NOT SAVE the memory if procedure says to remove a battery cable
Supplemental Restraint System
If deployed: Sodium Hydroxide powder is irritating to skin and lungs Clock spring connector likely needs replacing due to power surge
Clock-Spring Coil
Follow specific procedure for centering clock spring coil.
Some call for clockwise rotation
Others call for counter-clockwise rotation Clock-Spring Coil If clock-spring is removed it must be centered.
If steering linkage is removed …. ….remove the clock-spring… ….OR lock steering.
If Clock-Spring is not centered… …or allowed to Over-Rotate… . Clock-Spring will break and Air Bag lamp will Turn On